Tuesday, March 20, 2012

Diagnosing Sensitivity, Allergy Or Intolerance To Food Via Blood Tests

Blood testing to determine a link between food and illness is increasingly common, but some tests are not considered diagnostic and can lead to confusion, according to a primer in CMAJ (Canadian Medical Association Journal).

Both traditional physicians and holistic medicine practitioners may offer blood testing to diagnose adverse reactions to food. A food allergy is a specific immunologic reaction to a food that can be reproduced with exposure to the food in question. An intolerance is an adverse reaction without an immunologic response, such as lactose intolerance. However, "food sensitivity" is a general term that may be used for any symptom or response that is thought to be food related.

The distinctions between all of the above may not be clear to patients and can be misunderstood. Moreover, unstandardized food sensitivity tests, which can cost hundreds of dollars, are widely available and can be purchased by patients from a variety of health care providers as well as some pharmacies. One common type of blood testing uses a measure of immunoglobulin G (IgG) antibody binding to specific foods. However, the presence of these antibodies may be part of the normal human response and indicate tolerance to these foods, rather than an adverse reaction.

"Physicians should caution patients about the controversy surrounding testing for food sensitivity," writes Dr. Elana Lavine, Humber River Regional Hospital, Toronto. "Recent position papers from European and American allergy and immunology societies have emphasized the limitations and potential misuse of IgG4 testing, indicating that these tests are not appropriate for making a diagnosis of food allergy."

Patients may visit their doctors for advice after their test results indicate a host of foods to avoid. It is important for physicians to explain that there is no proven role for IgG testing in diagnosing food allergies or guiding food elimination plans.

http://www.medicalnewstoday.com/releases/243103.php


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Monday, March 19, 2012

Obesity raises death risk tied to sleeping pills

New findings delivered at American Heart Association meeting also show heightened risk in men and young adults

SAN DIEGO -- Obesity appears to significantly increase the risk of death tied to sleeping pills, nearly doubling the rate of mortality even among those prescribed 18 or fewer pills in a year, researchers reported Friday.
"Obesity emerged as a marker of increased vulnerability," said Robert Langer, M.D., M.P.H., at the annual American Heart Association's Epidemiology and Prevention | Nutrition, Physical Activity and Metabolism 2012 Scientific Sessions in San Diego.
"The associations between sleeping pills and increased mortality were present, and relatively stronger, even in people aged 18 to 54," said Dr. Langer, a family physician and epidemiologist with the Jackson Hole Center for Preventive Medicine in Jackson, Wyo.
"Obese patients appear particularly vulnerable, perhaps through interaction with sleep apnea," said study co-author Daniel Kripke, M.D., a psychiatrist with Scripps Clinic's Viterbi Family Sleep Center in San Diego.
He noted that sleeping pills were previously associated with more and longer pauses in breathing in people with sleep apnea.
Among obese patients, use of sleeping pills was associated with about one extra death per year for every 100 people who were prescribed the medications, Dr. Langer said.
Additionally, men who took sleeping pills were about twice as likely to die as women who received the medications, after accounting for other factors, he said.
Friday's findings were the latest to emerge from a Scripps Clinic-led study of almost 40,000 patients, which was initially published in late February in the open-access online journal BMJ Open.
(View the paper here: http://bmjopen.bmj.com/content/2/1/e000850.full)
The research was the first to show that eight of the most commonly used hypnotic drugs were associated with increased hazards of mortality and cancer, including the popularly prescribed medications zolpidem (known by the brand name Ambien) and temazepam (also known as Restoril), Dr. Kripke said.
Those drugs had been thought to be safer than older hypnotics because of their shorter duration of action but were found to have associations with excess deaths no different from the older drugs they have largely replaced.
In order to eliminate the possibility that other factors led to the results, study participants who were prescribed sleeping pills were matched with control patients of similar ages, gender and health who did not receive hypnotics.
The newest findings were delivered by Dr. Langer during an oral session at the American Heart Association conference that focused on drug safety.
For obese patients in the study who had an average body mass index of 38.8, the risk of death was 8.1 times higher on average among those who were prescribed the smallest number of pills (18 or fewer annually) when compared with similar study participants who did not take the medications. The mortality rate was 9.3 times higher on average among obese patients receiving the largest number of pills (132 or more annually).
Death was 4.6 times more likely on average among all patients who received any amount of sleeping pills.
The study cast a shadow over a growing segment of the pharmaceutical industry that expanded by 23 percent in the United States from 2006 to 2010 and generated about $2 billion in annual sales.
Using data stored in an electronic medical record that has been in place for more than a decade, the researchers obtained information on almost 40,000 patients cared for by a large integrated health system in the northeastern United States.
The research included 10,531 sleeping pill users who were prescribed the medications for an average of 2.5 years and 23,674 control participants who were not prescribed the drugs. Information came from outpatient clinic visits conducted between Jan. 1, 2002, and Sept. 30, 2006.
"It is important to note that our results are based on observational data, so even though we did everything we could to ensure their validity, it's still possible that other factors explain the associations," said co-author Lawrence E. Kline, D.O., who is medical director of the Viterbi Family Sleep Center. "We hope our work will spur additional research in this area using information from other populations."
Funding for the study came from the Scripps Health Foundation and other philanthropic sources.
The research should prompt physicians to consider alternatives to hypnotic medications, Dr. Kline said.
Clinicians at the Viterbi Family Sleep Center focus on cognitive therapy that teaches patients to better understand the nature of sleep. For example, some people suffering from insomnia might require less than the eight hours of sleep commonly recommended for each night.
Patients also can benefit from practicing good sleeping habits and relaxation, as well as taking advantage of the body's natural clock, which is driven by the rising and setting of the sun, Dr. Kline said. "Understanding how to use the circadian rhythm is a very powerful tool that doesn't require a prescription," he said.
When insomnia results from emotional problems such as depression, doctors should treat the psychological disorder rather than prescribe sleeping pills that could prove to be harmful, Dr. Kripke said.

http://www.eurekalert.org/pub_releases/2012-03/sh-ord031612.php


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Exercise Can Lead To Female Orgasm, Sexual Pleasure, According To Unique Study

Findings from a first-of-its-kind study by Indiana University researchers confirm anecdotal evidence that exercise -- absent sex or fantasies -- can lead to female orgasm.

While the findings are new, reports of this phenomenon, sometimes called "coregasm" because of its association with exercises for core abdominal muscles, have circulated in the media for years, said Debby Herbenick, co-director of the Center for Sexual Health Promotion in IU's School of Health, Physical Education and Recreation. In addition to being a researcher, Herbenick is a widely read advice columnist and book author.

"The most common exercises associated with exercise-induced orgasm were abdominal exercises, climbing poles or ropes, biking/spinning and weight lifting," Herbenick said. "These data are interesting because they suggest that orgasm is not necessarily a sexual event, and they may also teach us more about the bodily processes underlying women's experiences of orgasm."

The findings are published in a special issue of Sexual and Relationship Therapy, a leading peer-reviewed journal in the area of sex therapy and sexual health. Co-author is J. Dennis Fortenberry, M.D., professor at the IU School of Medicine and Center for Sexual Health Promotion affiliate.

The results are based on surveys administered online to 124 women who reported experiencing exercise-induced orgasms (EIO) and 246 women who experienced exercise-induced sexual pleasure (EISP). The women ranged in age from 18 to 63. Most were in a relationship or married, and about 69 percent identified themselves as heterosexual.

Here are some key findings:
  • About 40 percent of women who had experienced EIO and EISP had done so on more than 10 occasions.
  • Most of the women in the EIO group reported feeling some degree of self-consciousness when exercising in public places, with about 20 percent reporting they could not control their experience.
  • Most women reporting EIO said they were not fantasizing sexually or thinking about anyone they were attracted to during their experiences.
  • Diverse types of physical exercise were associated with EIO and EISP. Of the EIO group, 51.4 percent reported experiencing an orgasm in connection with abdominal exercises within the previous 90 days. Others reported experiencing orgasm in connection to such exercises as weight lifting (26.5 percent), yoga (20 percent), bicycling (15.8), running (13.2 percent) and walking/hiking (9.6 percent).
  • In open-ended responses, ab exercises were particularly associated with the "captain's chair," which consists of a rack with padded arm rests and back support that allows the legs to hang free. The goal is to repeatedly lift the knees toward the chest or toward a 90-degree angle with the body.
Herbenick said that the mechanisms behind exercise-induced orgasm and exercise-induced sexual pleasure remain unclear and, in future research, they hope to learn more about triggers for both. She also said that study findings may help women who experience EIO/EISP feel more normal about their experiences or put them into context.

Herbenick cautioned that it is not yet known whether such exercises can improve women's sexual experiences.

"It may be that exercise -- which is already known to have significant benefits to health and well-being -- has the potential to enhance women's sexual lives as well."

The study did not determine how common it is for women to experience exercise-induced orgasm or exercise-induced sexual pleasure. But the authors note that it took only five weeks to recruit the 370 women who experienced the phenomenon, suggesting it is not rare.

"Magazines and blogs have long highlighted cases of what they sometimes call 'coregasms,'" Herbenick said. "But aside from early reports by Kinsey and colleagues, this is an area of women's sexual health research that has been largely ignored over the past six decades."

http://www.medicalnewstoday.com/releases/243082.php


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Friday, March 16, 2012

Risk Of Mild Cognitive Impairment, Parkinson's, Doubled By REM Sleep Disorder

People with symptoms suggesting rapid eye movement sleep behavior disorder, or RBD, have twice the risk of developing mild cognitive impairment (MCI) or Parkinson's disease within four years of diagnosis with the sleep problem, compared with people without the disorder, a Mayo Clinic study has found. The researchers published their findings recently in the Annals of Neurology.

One of the hallmarks of rapid eye movement (REM) sleep is a state of paralysis. In contrast, people with rapid eye movement sleep behavior disorder, appear to act out their dreams when they are in REM sleep. Researchers used the Mayo Sleep Questionnaire to diagnose probable RBD in people who were otherwise neurologically normal. Approximately 34 percent of people diagnosed with probable RBD developed MCI or Parkinson's disease within four years of entering the study, a rate 2.2 times greater than those with normal rapid eye movement sleep.

"Understanding that certain patients are at greater risk for MCI or Parkinson's disease will allow for early intervention, which is vital in the case of such disorders that destroy brain cells. Although we are still searching for effective treatments, our best chance of success is to identify and treat these disorders early, before cell death," says co-author Brad Boeve, M.D., a Mayo Clinic neurologist.

Previous studies of Mayo Clinic patients have shown that an estimated 45 percent of people who suffer from RBD will develop a neurodegenerative syndrome such as mild cognitive impairment or Parkinson's disease within five years of diagnosis.

RBD, MCI and Parkinson's Disease

"This study is the first to quantify the risk associated with probable RBD in average people, not clinical patients, and it shows that we can predict the onset of some neurodegenerative disorders simply by asking a few critical questions," says lead author Brendon P. Boot, M.D., a behavioral neurologist. Dr. Boot was at Mayo Clinic when the study was conducted. He is now at Harvard University.

MCI is an intermediate stage between the expected cognitive decline of normal aging and the more pronounced decline of dementia. It involves problems with memory, language, thinking and judgment that are greater than typical age-related changes.

An estimated 500,000 Americans suffer from Parkinson's disease, which is characterized by tremor or shakiness, stiffness of the limbs and trunk, slowness of movement, and impaired balance and coordination.

http://www.medicalnewstoday.com/releases/242889.php


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Calorie Consumption Likely To Increase With Insufficient Sleep

If you don't get enough sleep, you may also eat too much - and thus be more likely to become obese.

That is the findings of researchers who presented their study at the American Heart Association's Epidemiology and Prevention/Nutrition, Physical Activity and Metabolism 2012 Scientific Sessions.

"We tested whether lack of sleep altered the levels of the hormones leptin and ghrelin, increased the amount of food people ate, and affected energy burned through activity," said Virend Somers, M.D., Ph.D., study author and professor of medicine and cardiovascular disease at the Mayo Clinic, Rochester, Minn.. Leptin and ghrelin are associated with appetite.

The researchers studied 17 normal, healthy young men and women for eight nights, with half of the participants sleeping normally and half sleeping only two-thirds their normal time.

Participants ate as much as they wanted during the study.

Researchers found:
  • The sleep deprived group, who slept one hour and 20 minutes less than the control group each day consumed an average 549 additional calories each day.
  • The amount of energy used for activity didn't significantly change between groups, suggesting that those who slept less didn't burn additional calories.
  • Lack of sleep was associated with increased leptin levels and decreasing ghrelin - changes that were more likely a consequence, rather than a cause, of over-eating.
"Sleep deprivation is a growing problem, with 28 percent of adults now reporting that they get six or fewer hours of sleep per night," said Andrew D. Calvin, M.D., M.P.H., co-investigator, cardiology fellow and assistant professor of medicine at the Mayo Clinic.

The researchers noted that while this study suggests sleep deprivation may be an important part and one preventable cause of weight gain and obesity, it was a small study conducted in a hospital's clinical research unit.

"Larger studies of people in their home environments would help confirm our findings," Calvin said.
http://www.medicalnewstoday.com/releases/242927.php


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Thursday, March 15, 2012

Blood Vessel Function Improved By Losing Belly Fat, Whether From A Low-Carb Or A Low-Fat Diet

Overweight people who shed pounds, especially belly fat, can improve the function of their blood vessels no matter whether they are on a low-carb or a low-fat diet, according to a study presented by Johns Hopkins researchers at an American Heart Association scientific meeting in San Diego that is focused on cardiovascular disease prevention.

In the six-month weight-loss study, Hopkins researchers found that the more belly fat the participants lost, the better their arteries were able to expand when needed, allowing more blood to flow more freely. The researchers also found that participants in the study who were on a low-carb diet lost about ten pounds more, on average, than those who were on a low-fat diet. Being overweight increases the risk of cardiovascular disease, especially if the fat is accumulated in the belly above the waist.

"After six months, those who were on the low-carb diet lost an average of 28.9 pounds versus 18.7 pounds among those on the low-fat diet," says lead investigator Kerry J. Stewart, Ed.D., a professor of medicine at the Johns Hopkins University School of Medicine and director of clinical and research exercise physiology at the Johns Hopkins Heart and Vascular Institute.

Stewart and his colleagues studied 60 men and women who weighed an average of 215 pounds at the start of the program. Half of the participants went on a low-carb diet while the others followed a low-fat diet. All took part in moderate exercise and their diets provided a similar amount of calories each day.

In order to evaluate the health of the participants' blood vessels before and after the weight loss program, the researchers conducted a blood flow test by constricting circulation in the upper arm for five minutes with a blood pressure cuff. With this type of test, when the cuff is released, a healthier artery will expand more, allowing more blood to flow through the artery. The researchers measured how much blood reached the fingertips before, during, and after the constriction of the artery. Stewart says this test can give an indication of the overall health of the vascular system throughout the body. The researchers found that the more belly fat a person had lost, the greater the blood flow to the finger, signaling better the function of the artery.

"Our study demonstrated that the amount of improvement in the vessels was directly linked to how much central, or belly fat, the individuals lost, regardless of which diet they were on," says Stewart. "This is important since there have been concerns that a low-carb diet, which means eating more fat, may have a harmful effect on cardiovascular health. These results showed no harmful effects from the low-carb diet."

In the low-carb diet used in the study, up to 30 percent of calories came from carbs such as bread, pasta and certain fruits, while 40 percent was from fat consumed from meat, dairy products and nuts. In contrast, the low-fat diet consisted of no more than 30 percent of calories from fat and 55 percent from carbs.

Stewart notes that participants on the low-carb diet lost more weight and at a faster pace, on average, which has also been seen in several other studies. He says eating higher amounts of carbohydrates can slow down the rate of body fat loss while on a weight reduction diet.

The findings were consistent with early results presented by Stewart in June 2011 at the annual meeting of the American College of Sports Medicine in Denver. That initial report was based on results after participants in the study had lost their first 10 pounds. These longer-term results show that weight loss, along with exercise, is important for improving vascular health, and suggests following a low-carb diet rather than the conventionally recommended low-fat diet for weight loss is not a concern in terms of vascular health.

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How Added Sugar In Diet Leads To Obesity, Diabetes - New Clues About Fructose

A new animal study published on Monday in the Proceedings of the National Academy of Sciences, offers new clues about the mechanism through which a diet high in fructose, such as from added sugar and high fructose corn syrup, may contribute to the development of obesity and diabetes.

Previous studies have already shown that fructose intake from added sugar is linked with the epidemic rise in obesity, metabolic syndrome, and nonalcoholic fatty liver disease.

Metabolic syndrome is a group of risk factors that raises a person's risk for diabetes, heart disease, stroke, and other health problems. It currently affects more than one in four Americans.

There is also evidence that fructose intake causes features of metabolic syndrome in animals and humans. This suggests, for instance, if you compared two diets of similar calorie intake, the one with more fructose, as opposed to more starch, will lead to greater accumulation of fat around organs and higher insulin resistance.

Using lab mice, the international team of researchers, led by senior author Dr Richard Johnson, Chief of the Division of Renal Diseases and Hypertension at the University of Colorado School of Medicine, found that fructose is metabolized by two forms of an enzyme: fructokinase C and fructokinase A.

They discovered that the two forms of fructokinase appear to be responsible for two contrasting effects: one causing fatty liver, obesity, and insulin resistance, and the other protecting against these effects in response to sugar.

"By reducing the amount of fructose for metabolism in the liver, fructokinase A protects against fructokinase C-mediated metabolic syndrome", write the authors, who conclude that:

"These studies provide insights into the mechanisms by which fructose causes obesity and metabolic syndrome".

Written by Catharine Paddock PhD
http://www.medicalnewstoday.com/articles/242259.php


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Skeletal Muscle Function May Be Enhanced By Epicatechin-Enriched Cocoa

A small clinical trial led by researchers at UC San Diego School of Medicine and VA San Diego Healthcare System (VASDHS) found that patients with advanced heart failure and type 2 diabetes showed improved mitochondrial structure after three months of treatment with epicatechin-enriched cocoa. Epicatechin is a flavonoid found in dark chocolate.

The results of this initial study has led to the implementation of larger, placebo-controlled clinical trial at UC San Diego School of Medicine and VASDHS to assess if patients with heart failure and diabetes show improvement in their exercise capacity when treated with epicatechin-rich cocoa.

The study published this week by the journal Clinical and Translational Science looked at five profoundly ill patients with major damage to skeletal muscle mitochondria. Mitochondria are structures responsible for most of the energy produced in cells. These "fuel cells" are dysfunctional as a result of both type 2 diabetes and heart failure, leading to abnormalities in skeletal muscle. In patients with heart failure and diabetes abnormalities in both the heart and skeletal muscle result in impaired functional capacity. These patients often complain of shortness of breath, lack of energy and have difficulty walking even short distances.

The trial participants consumed dark chocolate bars and a beverage with a total epicatechin content of approximately 100 mg per day for three months. Biopsies of skeletal muscle were conducted before and after treatment. After the three-month treatment, the researchers looked at changes in mitochondria volume and the abundance of cristae, which are internal compartments of mitochondria that are necessary for efficient function of the mitochondria, and measurable by electron microscopy.

"The cristae had been severely damaged and decreased in quantity in these patients," said one of the senior investigators, Francisco J. Villarreal, MD, PhD of UC San Diego's Department of Medicine's Division of Cardiology. "After three months, we saw recovery - cristae numbers back toward normal levels, and increases in several molecular indicators involved in new mitochondria production."

The results, which mimicked earlier studies showing improvement in skeletal and heart muscle function in animal models after treatment with epicatechin, were promising enough to prompt the larger study.

The principal investigator of this trial was Pam R. Taub, MD, assistant professor of medicine at UC San Diego and the VA San Diego Healthcare System. Taub will be leading the new clinical trial at UC San Diego that will enroll normal sedentary subjects as well as patients with heart failure/diabetes who will be treated with placebo, or epicatechin-rich chocolate.
http://www.medicalnewstoday.com/releases/242482.php


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Overweight People May Benefit From Active Breaks During Prolonged Sitting

Interrupting prolonged periods of sitting with regular, two-minute breaks of light or moderate intensity activity like walking may be good for overweight and obese people's health, because new research reported recently in Diabetes Care shows it helped their bodies keep glucose and insulin levels under control after consuming the equivalent of a high calorie meal ("postprandial" levels).

Repeated spikes in blood sugar or glucose, such as those that can occur after a meal, have been linked to poor health outcomes, including artery stiffening and cardiovascular disease. The body keeps glucose levels under control with insulin secreted from the pancreas.

Study leader Associate Professor David Dunstan, of the Baker IDI Heart and Diabetes Institute, in Melbourne, Victoria, Australia, told the press that with larger and more frequent spikes, the walls of our arteries and veins become more and more damaged.

"This increases our susceptibility to heart disease. So, we want to minimise these rises in order to improve our health outcomes," he explained.

"Our research has already shown that sitting for long periods can be hazardous to health. Sedentary behaviour is also a risk factor for chronic diseases, including some cancers," said Dunstan.

For their study, the researchers recruited 19 participants aged 45 to 65 who were either overweight or obese.

Each participant took part in three experiments, with six days break between each one.

In the first experiment they had to sit for 5 hours with no break. In the second experiment they sat for the same length of time, but every 20 minutes they walked on a treadmill at a light-intensity pace for 2 minutes. And in the third experiment, they did the same as the second, except the pace was at moderate intensity.

The idea was to create conditions similar to that of office workers who sit at their desks for long periods.

To provide a reliable measure of blood glucose that could be compared across all three experiments, before each experiment the participants sat for two hours, uninterrupted. Then they were given a standardized test drink containing 75g of glucose and 50g of fat (to give the digestive effect of a high calorie meal). Their glucose and insulin levels were then tested at the end of the 5 hour periods in each of the three experiments.

Dunstan said:

"In a controlled laboratory environment that mimicked the typical patterns of desk-bound office workers, participants who interrupted their sitting time with regular activity breaks, showed up to 30% improvement in the body's response to a meal containing glucose."

And he and his colleagues were surprised to find there was little difference in benefit between high and moderate intensity activity:

"The good news is that the improvements were seen even with light-intensity activity, which is the equivalent of strolling," said Dunstan.

This would suggest that it is not the amount of effort involved that has an effect, but just the act of standing, moving and reducing sitting time.

Dunstan said we need to accept that our bodies are not designed for prolonged sitting. If you look back twenty years or so, even in office environments people moved around more, throughout the working day.

"Prior to email, people had to collect mail from a pigeon hole, or walk over to people's desks for a chat. I think we've reached a crisis point where we need to step back and acknowledge that sitting for long periods is not what our bodies were designed for."

"The results of this study now provide some direction about what activity can be undertaken to break up sitting time and counteract the negative effects of sitting for long periods, including the frequency of breaks required to improve health outcomes," he added.

The benefit of frequent breaks of activity comes about because when we sit, our muscles are essentially asleep, says Dunstan. But when we are up and moving, they wake up: we contract our muscles, and this is what helps to regulate the body's metabolic system.

The findings also bolster another Australian occupational health and safety recommendation: that employees who sit at desks and look at screens should break every 30 minutes to relieve their eyes.

Dunstan and colleagues are keen to point out that while much of their discussion is around office workers, there are many other settings where people sit for hours on end without a break, such as watching TV, playing video games, using home computers, and driving cars.

They also point out that while their participants were overweight or obese, the findings will apply to anyone who sits for long periods: they could also benefit from breaking up their sitting time.

In an office environment it is not likely that you will find a convenient treadmill but there are other ways to break up sitting time at work, such as standing up regularly, or walking to the printer, using the stairs instead of the elevator. Even standing up while you use the phone can be of benefit, said Dunstan.

Tips for Breaking Up Sitting Time

Here are some tips for breaking up prolonged sitting time, in the office and at home:
  • Start a new trend: hold meetings standing up (you might find they benefit from being shorter too!)
  • Have meetings while walking outdoors (try it with one-to-one meetings).
  • Consider using a desk that you can adjust to use while standing.
  • Stand up and move around when you are on the phone.
  • Go for a brisk walk during your lunch break.
  • Eat your lunch standing up: eg at a high table.
  • Limit TV viewing to no more than two hours a day.
  • Use commercial breaks to get up and do chores.
  • Wherever you are sitting for a long time, whether at home, in the office, on a plane or train, try to get up and move around at least once every hour.
Written by Catharine Paddock PhD

http://www.medicalnewstoday.com/articles/242658.php


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White Rice Raises Risk Of Diabetes Type 2

According to a study published today on bmj.com, consuming to much white rice regularly considerably increases the risk of developing type 2 diabetes.

In order to determine if the risk of developing type 2 diabetes is dependent on the amount of rice consumed and whether the Asian population, who generally consume more white rice than the Western world, have an even greater risk of developing the condition, researchers from the Harvard School of Public Health examined earlier studies and evidence of this association.

The researchers examined the results of four studies conducted in Japan, China, Australia, and the USA. At study baseline, all participants were diabetes free.

White rice has high GI values and is the leading type of rice consumed globally. Diets with high GI values are linked to an increased risk of developing type 2 diabetes. The Chinese population eats an average of four portions of rice per day while the Western population consumes less than five portions of rice per week.

In both Western and Asian countries, the team found a stronger association amongst women than men. In addition they found that the more white rice consumed, the higher the risk of developing type 2 diabetes. Each increased serving of white rice (assuming 158g per serving), increased the risk of developing type 2 diabetes by 10%, according to the teams estimate.

Brown rice contains more nutrients than white rice, including vitamins, fiber, and magnesium, some of which are linked to a lower risk of type 2 diabetes. As white rice has a lower content of nutrients, consuming too much could result in an increased risk of type 2 diabetes.

The researchers conclude:

"Higher white rice intake is associated with a significantly elevated risk of type 2 diabetes."

This risk applies to both Western Cultures as well as Asian. However, due to the finding indicating that the more rice consumed the higher the risk, the researchers believe Asian countries are at a greater risk. The researchers advise that individuals consume whole grains rather than refined carbohydrates, such as white rice, and that by doing so will hopefully slow down the worldwide diabetes epidemic.

In an associated report, Dr. Bruce Neal from the University of Sydney states that larger studies are required in order to confirm the theory that white rice increases the risk of developing type 2 diabetes.

Written by Grace Rattue
http://www.medicalnewstoday.com/articles/242962.php


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Skin Tone Linked To Fruit And Veg Consumption

Most people know eating plenty of fresh fruits and vegetables is good for long term health, but unfortunately, not that many actually consume the recommended daily amount. Now scientists at the University of St Andrews in the UK are hoping to appeal to another motivator: vanity. They report in a study published recently in the American Journal of Public Health, that eating more fruit and vegetables can change skin tone, lending it a healthier glow, within a matter of weeks.

Apparently it is all down to carotenoids, the orangey-red pigments found in fruits and vegetables.

Study supervisor Professor David Perrett and colleagues found that just two extra portions of fruit and veg a day for six weeks was enough to cause a detectable change in skin tone.

For the study, they recruited 35 students and followed their diet and changes in skin colour over 6 weeks. They also monitored how much of a change in skin colour had to take place before it was noticed by others.

The results showed that participants that increased their consumption of fruits and vegetables over the observation period showed a change in skin colour, toward more of a golden healthy glow. Those whose diet went the other way, with less fruit and veg, showed a reduction in skin tone.

In a media statement released this week, lead author Ross Whitehead, a researcher at St Andrews, said:

"People who eat more fruit and vegetables have a 'golden' skin tone that looks healthy and attractive. Our latest research finds that even small improvements in diet produces visible benefits to skin colour."

He said they were very surprised at how quickly the change occured.

Perrett said:

"Although skin colour varies markedly across the world, we find similar effects across different cultures - for Asians and Europeans alike a good diet is associated with an attractive skin tone."

"The message that a good diet improves skin colour could improve health across the globe," he added.

The researchers note that 75% of Britons do not eat the goverment-recommended "5 a Day": five portions of fruit and/or vegetables. They say this is particularly shocking when you consider that the UK recommendations are lower than those of many other countries: for instance in the US, the government suggests active men should be eating up to "13 a day". However, the Americans appear to be faring as poorly as the Brits in turning the ideal into reality.

Perhaps it is time to appeal to vanity, or something that will yield tangible benefit in a shorter time, argue the researchers.

Co-author Dr Gozde Ozakinci lectures in Health Psychology at St Andrews. He said:

"Appearance can be a powerful motivator. It is being used in other health campaigns to persuade people to avoid smoking, excessive sun exposure and alcohol consumption, all of which may speed up ageing. Our research points to the different benefits of a diet rich in fruit and vegetables on a healthy skin appearance."

Whitehead said:

"Most of us know we should eat plenty of fruit and veg, yet we are not sufficiently motivated to actually go ahead and eat a healthy diet.Government strategies aimed at improving diet typically only offer information about why a healthy diet is good for us. These strategies have, so far, had no real impact on the nation's eating habits."

"We hope that by highlighting the rapidly achievable benefits of a healthy diet on our attractiveness will be a stronger incentive for people to eat more healthily. Knowing you are going to look more attractive in a few weeks may be more persuasive than the promise of health benefits later in life," he added.

He and his colleagues conclude:

"This approach represents a novel direction for the field and is potentially suitable for cost-effective, population-level dissemination through the visual media."

The researchers believe eating much larger amounts of fruit and vegetables could make skin take on an even healthier glow in the long run.

They are currently carrying out trials in Scotland, investigating whether people can be persuaded to change their diets if they can see the positive changes that result.

Funds from the Economic and Social Research Council (ESRC) and Unilever Research & Development USA are helping to pay for the study, while Perrett leads it under a British Academy Wolfson Research Professorship.

Written by Catharine Paddock PhD
http://www.medicalnewstoday.com/articles/242679.php


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Daily Sugary Drinks Raise Heart Disease Risk In Males

Beverages with sugar added raise a man's risk of developing heart disease by 20% if he drinks one per day, while their equivalent "diet" drinks seem not to, researchers from Harvard School of Public Health reported in the journal Circulation. They defined one drink as a 12-ounce portion.

Risk factors linked to heart disease include poor diet, obesity, family history of heart disease, regular tobacco smoking, not enough exercise, high alcohol consumption, and diabetes. According to the American Heart Association, heart disease is the largest cause of death in America.

Lead Author, Frank B. Hu, M.D., Ph.D., said:


"This study adds to the growing evidence that sugary beverages are detrimental to cardiovascular health. Certainly, it provides strong justification for reducing sugary beverage consumption among patients, and more importantly, in the general population."


The authors say that after taking into account all heart disease risk factors, the increased risk still persisted. They gathered data on 42,883 males in the Health Professionals Follow-Up Study.

Participants completed a questionnaire every two years from 1986 to 2008. Questions focused on their health habits and diet. Blood samples were also taken at the beginning, middle and end of the study period. The majority of participants were aged 40 to 75 years, Caucasian, and in health-related jobs.

Soft drink shelf
The consumption of beverages with added sugar has increased considerably over the last twenty years

Individuals who limited their intake to two sugary drinks per week or less had no raised heart disease risk, the researchers found.

They also found that everyday sugary beverage drinkers had higher C-reactive protein (CRP), triglyceride and lower HDL blood levels - all biomarkers or indicators for heart disease.

People who regularly consumed "diet" drinks - artificially sweetened drinks - were not found to have higher heart disease risk, or raised biomarkers for heart disease.

The authors stressed that the health habits of the men in their study may be different from the general population's. They added that a study on women, with data gathered from the 2009 Nurses' Health Study, produced similar findings.

According to the American Heart Association, discretionary calories from added sugars should never constitute over half of such calories consumed. This translates into an average of approximately 150 calories for adult males and 100 calories for females in the USA. Discretionary calories are referred to as an energy allowance after somebody's daily nutrient requirements have been met.

Written by Christian Nordqvist
http://www.medicalnewstoday.com/articles/242842.php


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Trans Fat Consumption Linked To Irritability, Aggression

Might the "Twinkie defense" have a scientific foundation after all? Researchers at the University of California, San Diego School of Medicine have shown - by each of a range of measures, in men and women of all ages, in Caucasians and minorities - that consumption of dietary trans fatty acids (dTFAs) is associated with irritability and aggression.

The study of nearly 1,000 men and women provides the first evidence linking dTFAs with adverse behaviors that impacted others, ranging from impatience to overt aggression. The research, led by Beatrice Golomb, MD, PhD, associate professor in the UC San Diego Department of Medicine, has been published online by PLoS ONE.

Dietary trans fatty acids are primarily products of hydrogenation, which makes unsaturated oils solid at room temperature. They are present at high levels in margarines, shortenings and prepared foods. Adverse health effects of dTFAs have been identified in lipid levels, metabolic function, insulin resistance, oxidation, inflammation, and cardiac health.

The UC San Diego team used baseline dietary information and behavioral assessments of 945 adult men and women to analyze the relationship between dTFAs and aggression or irritability. The survey measured such factors as a life history of aggression, conflict tactics and self-rated impatience and irritability, as well as an "overt aggression" scale that tallies recent aggressive behaviors. Analyses were adjusted for sex, age, education, and use of alcohol or tobacco products.

"We found that greater trans fatty acids were significantly associated with greater aggression, and were more consistently predictive of aggression and irritability, across the measures tested, than the other known aggression predictors that were assessed," said Golomb. "If the association between trans fats and aggressive behavior proves to be causal, this adds further rationale to recommendations to avoid eating trans fats, or including them in foods provided at institutions like schools and prisons, since the detrimental effects of trans fats may extend beyond the person who consumes them to affect others."
http://www.medicalnewstoday.com/releases/242886.php


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Thursday, March 8, 2012

Flavanols And Procyanidins Research Provides New Insights Into How These Phytonutrients May Positively Impact Human Health

Collaborative research by Mars, Incorporated and the University of California, Davis has provided important new insights into the distinct roles of flavanols and procyanidins in the human body. Recently published online in the American Journal of Clinical Nutrition, the findings significantly advance understanding of how these phytonutrients may work in the body to exert cardiovascular benefits. In ways not previously possible, the researchers were able to gain novel insights that further our understanding of the metabolic fate of procyanidins, and highlight the need for more careful discrimination between flavanols and procyanidins when examining the health benefits of foods. Taken together, these findings may enable stronger and clearer associations between health and the intake of specific food components, and a more comprehensive understanding of the cardiovascular health benefits of flavanols and procyanidins.

Flavanols and procyanidins are sub-classes of a group of natural compounds called flavonoids. A growing body of evidence demonstrates that foods rich in flavanols and procyanidins, such as cocoa, can have a positive impact on blood vessel function and cardiovascular health. To understand how the flavanols and procyanidins present in certain foods may exert their cardiovascular effects, it is crucial to assess what happens to these compounds in the body following consumption. Previous studies have demonstrated that flavanols are absorbed, enter the body, and directly mediate improvements in cardiovascular function. In contrast, procyanidins have been shown to be poorly absorbed or not at all and evidence for a direct effect of procyanidins on blood vessel function is therefore limited.

Nevertheless, as flavanols are the structural building blocks of procyanidins, it has been proposed that digestive processes in the gut may cause the break-down of procyanidins into flavanols, which may subsequently be absorbed into the body. If correct, this "break-down hypothesis" would mean that procyanidins exert cardiovascular benefits by acting as precursors of flavanols. Answering this question is therefore crucial for a comprehensive understanding of the role of these phytonutrients for human health and nutrition.

"Assessing whether or not procyanidins are absorbed or contribute to the systemic flavanol pool is more than just a technical distinction. In fact, the answers to these questions could have a significant impact on investigations into the mechanisms underlying the cardiovascular health benefits associated with the intake of flavanol- and procyanidin-containing foods," commented Dr. Hagen Schroeter - study author and director of fundamental health and nutrition research at Mars, Incorporated.

As flavanols and procyanidins are commonly found together in foods, such as cocoa, grapes, and apples, up until now it has not been possible to directly assess the individual contribution of procyanidins to the circulating pool of flavanols in the body. Using carefully developed, nutrient-matched cocoa-based drinks, containing flavanols and procyanidins either in combination or individually, the researchers in this study were able to confirm that procyanidins are poorly absorbed. More importantly, the study also demonstrated for the first time that procyanidins do not break-down in the gut to contribute to the flavanols present in circulation. This outcome makes it very unlikely that procyanidins affect blood vessel function, either directly or through a break-down into flavanols. Interestingly, the research also demonstrates that micro-organisms in the digestive system transform both flavanols and procyanidins into another group of compounds called gamma-valerolactones. Further research is needed to investigate if, and to what extent, these compounds formed in the gut contribute to the cardiovascular health benefits observed following the consumption of foods rich in flavanols and procyanidins. In addition, the data of this study do not rule out the possibility that procyanidins may exert biological activities in the digestive system that may be beneficial for human health.

Dr. Schroeter further commented on the implications of these findings, "The differences between the absorption and metabolism of flavanols and procyanidins, as demonstrated by this research, may prompt changes in how scientists design and interpret epidemiological investigations and in vitro studies to more meaningfully reflect what happens in the body. Furthermore, the fact that our results mean that it is unlikely that procyanidins exert direct effects on blood vessel function, may lead researchers to focus specifically on studying the mechanisms by which flavanols - and perhaps even gamma-valerolactones - affect cardiovascular function."
http://www.medicalnewstoday.com/releases/242602.php


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How Vitamin D May Help Clear Amyloid Plaques Found In Alzheimer's

A team of academic researchers has identified the intracellular mechanisms regulated by vitamin D3 that may help the body clear the brain of amyloid beta, the main component of plaques associated with Alzheimer's disease.

Published in the Journal of Alzheimer's Disease, the early findings show that vitamin D3 may activate key genes and cellular signaling networks to help stimulate the immune system to clear the amyloid-beta protein.

Previous laboratory work by the team demonstrated that specific types of immune cells in Alzheimer's patients may respond to therapy with vitamin D3 and curcumin, a chemical found in turmeric spice, by stimulating the innate immune system to clear amyloid beta. But the researchers didn't know how it worked.

"This new study helped clarify the key mechanisms involved, which will help us better understand the usefulness of vitamin D3 and curcumin as possible therapies for Alzheimer's disease," said study author Dr. Milan Fiala, a researcher at the David Geffen School of Medicine at UCLA and the Veterans Affairs Greater Los Angeles Healthcare System.

For the study, scientists drew blood samples from Alzheimer's patients and healthy controls and then isolated critical immune cells from the blood called macrophages, which are responsible for gobbling up amyloid beta and other waste products in the brain and body.

The team incubated the immune cells overnight with amyloid beta. An active form of vitamin D3 called 1a,25-dihydroxyvitamin D3, which is made in the body by enzymatic conversion in the liver and kidneys, was added to some of the cells to gauge the effect it had on amyloid beta absorption.

Previous work by the team, based on the function of Alzheimer's patients' macrophages, showed that there are at least two types of patients and macrophages: Type I macrophages are

improved by addition of 1a,25-dihydroxyvitamin D3 and curcuminoids (a synthetic form of curcumin), while Type II macrophages are improved only by adding 1a,25-dihydroxyvitamin D3.

Researchers found that in both Type I and Type II macrophages, the added 1a,25-dihydroxyvitamin D3 played a key role in opening a specific chloride channel called "chloride channel 3 (CLC3)," which is important in supporting the uptake of amyloid beta through the process known as phagocytosis. Curcuminoids activated this chloride channel only in Type I macrophages.

The scientists also found that 1a,25-dihydroxyvitamin D3 strongly helped trigger the genetic transcription of the chloride channel and the receptor for 1a,25-dihydroxyvitamin D3 in Type II macrophages. Transcription is the first step leading to gene expression.

The mechanisms behind the effects of 1a,25-dihydroxyvitamin D3 on phagocytosis were complex and dependent on calcium and signaling by the "MAPK" pathway, which helps communicate a signal from the vitamin D3 receptor located on the surface of a cell to the DNA in the cell's nucleus.

The pivotal effect of 1a,25-dihydroxyvitamin D3 was shown in a collaboration between Dr. Patrick R. Griffin from the Scripps Research Institute and Dr. Mathew T. Mizwicki from UC Riverside. They utilized a technique based on mass spectrometry, which showed that 1a,25-dihydroxyvitamin D3 stabilized many more critical sites on the vitamin D receptor than did the curcuminoids.

"Our findings demonstrate that active forms of vitamin D3 may be an important regulator of immune activities of macrophages in helping to clear amyloid plaques by directly regulating the expression of genes, as well as the structural physical workings of the cells," said study author Mizwicki, who was an assistant research biochemist in the department of biochemistry at UC Riverside when the study was conducted.

According to the team, one of the next stages of research would be a clinical trial with vitamin D3 to assess the impact on Alzheimer's disease patients. Previous studies by other teams have shown that a low serum level of 25-hydroxyvitamin D3 may be associated with cognitive decline. It is too early to recommend a definitive dosage of vitamin D3 to help with Alzheimer's disease and brain health, the researchers said. They add that ongoing studies are showing that vitamin D3 may be beneficial in reducing the incidence of a growing number of human diseases.
http://www.medicalnewstoday.com/releases/242610.php


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Study Finds Most Weight Loss Supplements Are Not Effective

An Oregon State University researcher has reviewed the body of evidence around weight loss supplements and has bad news for those trying to find a magic pill to lose weight and keep it off - it doesn't exist.

Melinda Manore reviewed the evidence surrounding hundreds of weight loss supplements, a $2.4 billion industry in the United States, and said no research evidence exists that any single product results in significant weight loss - and many have detrimental health benefits.

The study is online in the International Journal of Sport Nutrition and Exercise Metabolism.

A few products, including green tea, fiber and low-fat dairy supplements, can have a modest weight loss benefit of 3-4 pounds (2 kilos), but it is important to know that most of these supplements were tested as part of a reduced calorie diet.

"For most people, unless you alter your diet and get daily exercise, no supplement is going to have a big impact," Manore said.

Manore looked at supplements that fell into four categories: products such as chitosan that block absorption of fat or carbohydrates, stimulants such as caffeine or ephedra that increase metabolism, products such as conjugated linoleic acid that claim to change the body composition by decreasing fat, and appetite suppressants such as soluble fibers.

She found that many products had no randomized clinical trials examining their effectiveness, and most of the research studies did not include exercise. Most of the products showed less than a two-pound weight loss benefit compared to the placebo groups.

"I don't know how you eliminate exercise from the equation," Manore said. "The data is very strong that exercise is crucial to not only losing weight and preserving muscle mass, but keeping the weight off."

Manore, professor of nutrition and exercise sciences at OSU, is on the Science Board for the President's Council on Fitness, Sports and Nutrition. Her research is focused on the interaction of nutrition and exercise on health and performance.

"What people want is to lose weight and maintain or increase lean tissue mass," Manore said. "There is no evidence that any one supplement does this. And some have side effects ranging from the unpleasant, such as bloating and gas, to very serious issues such as strokes and heart problems."

As a dietician and researcher, Manore said the key to weight loss is to eat whole grains, fruits, vegetables and lean meats, reduce calorie intake of high-fat foods, and to keep moving. Depending on the individual, increasing protein may be beneficial (especially for those trying to not lose lean tissue), but the only way to lose weight is to make a lifestyle change.

"Adding fiber, calcium, protein and drinking green tea can help," Manore said. "But none of these will have much effect unless you exercise and eat fruits and vegetables."

Manore's general guidelines for a healthy lifestyle include:
  • Do not leave the house in the morning without having a plan for dinner. Spontaneous eating often results in poorer food choices.
  • If you do eat out, start your meal with a large salad with low-calorie dressing or a broth-based soup. You will feel much fuller and are less likely to eat your entire entrée. Better yet: split your entrée with a dining companion or just order an appetizer in addition to your soup or salad.
  • Find ways to keep moving, especially if you have a sedentary job. Manore said she tries to put calls on speaker phone so she can walk around while talking. During long meetings, ask if you can stand or pace for periods so you don't remain seated the entire time
  • Put vegetables into every meal possible. Shred vegetables into your pasta sauce, add them into meat or just buy lots of bags of fruits/vegetables for on-the-go eating.
  • Increase your fiber. Most Americans don't get nearly enough fiber. When possible, eat "wet" sources of fiber rather than dry - cooked oatmeal makes you feel fuller than a fiber cracker.
  • Make sure to eat whole fruits and vegetables instead of drinking your calories. Eat an apple rather than drink apple juice. Look at items that seem similar and eat the one that physically takes up more space. For example, eating 100 calories of grapes rather than 100 calories of raisins will make you feel fuller.
  • Eliminate processed foods. Manore said research increasingly shows that foods that are harder to digest (such as high fiber foods) have a greater "thermic effect" - or the way to boost your metabolism.
http://www.medicalnewstoday.com/releases/242611.php



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