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January 28, 2013
In Today's Issue
- Overweight? Shocking Proof that it may not be your fault
- Brain Research On Overeating and Obesity
- 1 Quick Technique To Burn More Fat
Overweight? Shocking Proof that it may not be your fault
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Brain Research On Overeating and Obesity
Dear Reader,
The Journal of the American Medical Association, always a fascinating publication, this week brings two intriguing studies that focus on obesity. Everyone knows the dangers of carrying too much weight... heart disease, a stroke, type 2 diabetes and even some cancers. Still we struggle. In one of the research projects appearing online first in the latest JAMA, scientists used state of the art imaging technology to show that fructose (a sugar that's no stranger to the American diet) can also bring changes in the brain that might make overeating more likely. In the second JAMA study, a controversial researcher finds evidence that being a bit overweight might not be so bad for you after all.
For the research on sugar and the brain, experts used magnetic resonance imaging (MRI for short) scans to look at the blood flow in the brain of 20 young subjects, all of normal weight, both before and after they'd consumed a beverage with glucose or fructose in two different sessions that were scheduled several weeks apart.
The scans found that drinking glucose turns off (suppresses) the activity of parts of the brain that are critical for reward and desire for food. Yale University endocrinologist Dr. Robert Sherwin, who led the study, says that with fructose these changes aren't seen and the desire to eat goes on, without getting turned off naturally.
What's intriguing is that the imaging mirrored how hungry the subjects say they were feeling. The work also echoed earlier results in animals. Fructose may be far more trouble, at least in terms of promoting food intake and thus weight gain, than glucose.
It appears that after consuming a fructose drink the brain doesn't register being full as it does when glucose is taken in. The study is small, and is no indictment of fructose or it's often vilified cousin high fructose corn syrup when it comes to carrying too much weight. Still the experts say the findings add evidence that these things might play a part in obesity. Work is ongoing to see if obese subjects react the same way to fructose and glucose.
All sugars aren't the same, even if they do have the same number of calories, simply because they're metabolized in different ways by the body. Doctors agree that no matter what the form, we all eat too much sugar.
It's true that these sugars have been added to many processed foods and drinks, and that consumption of these foods by the American public has risen dramatically since the 1970s. Not coincidentally say many, rates of obesity have gone up during this same time. Today a full one third of American children and teens, more than two thirds of adults, are considered obese or at best overweight.
There are things you can do to limit your sugar intake. Cook more at home and cut back on processed foods that have fructose and high fructose corn syrup. Avoid sugar-sweetened drinks, choose smaller sizes or limit how often you have them. Go for water or teas instead, and up that intake of fruits and vegetables.
Continues below...
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Brain Research On Overeating and Obesity Continued...
As to the second study, a far more controversial bit of research that appears in the same issue of JAMA, researchers found that only severe obesity may bring a high death risk, while a few extra pounds might actually give you a survival edge.
The work comes from a federal expert who is no stranger to controversy, Katherine Flegal of the Centers for Disease Control and Prevention, whose latest analysis bolsters an earlier, rather startling one from 2005. This time she assessed nearly 100 other projects that included nearly 2.9 million subjects the world over, to find that very obese people had the highest risk of death, but that overweight subjects had a 6% lower mortality rate than their thinner counterparts.
She also found that mildly obese subjects had a risk of death that was similar to those of normal weight. Critics are lining up, complaining that the study included people in the thin to fit category in what should be thought of as normal weight - those who might have cancer, another disease and smokers were all part of the research, but some portion of the thin subjects used are thought to be really sick, and the sick tend to die sooner.
A lot to think about... that's for sure.
To your good health,
Kirsten Whittaker
Daily Health Bulletin Editor
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Sources:
Original article:
http://news.yahoo.com/brain-image-study-fructose-may-spur-overeating-210254342.html
CDC info on obesity:
http://www.cdc.gov/obesity/data/adult.html
Yale University endocrinologist Dr. Robert Sherwin:
http://medicine.yale.edu/intmed/people/robert_sherwin.profile
Online first, RS Sherwin, Journal of the American Medical Association, 01.02.13:
http://jama.jamanetwork.com/article.aspx?articleid=1555133
Study abstract, KM Flegal, Journal of the American Medical Association, 01.02.13:
http://jama.jamanetwork.com/article.aspx?articleid=1555137
Research by Katherine Flegal of the Centers for Disease Control and Prevention
http://scholar.google.com/citations?user=D7CrQZkAAAAJ&hl=en
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