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Articles - Misc. : Weight
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From: Rene  (Original Message)Sent: 10/11/2006 6:47 PM
 


 


Study links added pounds to slightly poorer cognition


TUESDAY, Oct. 10/06 (HealthDay News) - Add another hazard to the pitfalls of being overweight - a few extra pounds might reduce your brainpower.

 
According to a new French study, heftier people score lower on cognitive tests, even when factors such as education level are taken into account.

The effect appears to be quite small, however.

"These tests are sensitive enough to detect small variations in scientific studies. However, in a middle-aged, healthy, active population, these differences in the cognitive performances may be hardly perceived by individuals," said study author Dr. Maxime Cournot, a researcher with the Toulouse University Hospital and the National Institute of Health and Medical Research in France.

The findings are published in the Oct. 10 issue of Neurology.

Following up on previous studies linking weight and cognition, the new study aimed to find out if there is a connection in middle-aged healthy people.

To do so, the researchers analyzed statistics from a survey of 2,223 salaried French workers in 1996 and 2001. The workers were between 32 and 62 years old in 1996.

The study authors first calculated each participant's body-mass index (BMI), a ratio of weight and height. For reference, a 5-foot-5-inch woman weighing 139 pounds has a BMI of 23, which is considered normal. Statistical overweight begins at a BMI of 25, and obesity starts at BMI 30 or over.

The team then compared BMI to the results of cognitive tests.

People with higher BMIs scored lower on cognitive tests that examined memory, attention and thought-processing. For example, people on the thin side - with a BMI of 20 - remembered an average of nine of 16 words in a memory test. On the other hand, those with a BMI of 30 remembered an average of seven words.

Those with higher BMIs also scored lower on the tests five years later.

The differences held up even when the numbers were adjusted for the possible influences of education level, age, gender and other factors.

The cognitive differences were very modest, Cournot said, but "slight consequences" linked to poorer cognition ability are still possible, she said.

How might obesity affect the brain? It's possible that excess weight could help clog the arteries in the brain just as it does in the heart, Cournot said. It's also possible, she added, that obesity could disrupt hormones such as insulin that affect brain cells.

Dr. David Knopman, a professor of neurology at Mayo Clinic College of Medicine, is familiar with the findings. He said the real culprits could be diabetes and high blood pressure, both of which are "more strongly and consistently linked to both cognitive decline and dementia risk."

Interestingly, people who became more overweight slowly over time didn't show higher levels of cognitive difficulties. That could be because the subjects weren't studied long enough or because the study wasn't designed to pick up such gradual changes, Cournot said.

According to Knopman, it's also possible that whatever process links obesity and mental skills had set in much earlier.

The study results need to be confirmed by other researchers, Cournot said, but they still support the general recommendation that people eat right and exercise to avoid obesity.

Knopman agreed. The study findings suggest that "obesity in midlife may have long term consequences for the brain, not just for the heart," he said.

Another study in Neurology echoed the French findings. Researchers at the University of Edinburgh, Scotland, found that mental fitness in old age is closely connected to physical fitness and intelligence levels in childhood.

The study was based on an analysis of 460 Scottish people who took part in a study in 1932 as children and then were tested again at age 79.

"Fitness contributes to better cognitive ability in old age," study author Ian Deary concluded in a prepared statement. "Thus, (of) two people starting out with the same IQ at age 11, the fitter person at age 79 will, on average, have better cognitive function."

 sympatico.MSN.ca   Copyright 2006 ScoutNews, LLC. All rights reserved


 

 


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From: ReneSent: 4/16/2007 10:07 PM
 

Newly Approved Alli Is No Weight-Loss Magic Pill

At nearly 84, my mother, a beautiful but pleasantly plump woman, called me excitedly. When could she start taking Alli, the new over-the-counter weight loss pill that has just been approved by the Food and Drug Administration?

Alli contains a medication called Orlistat that impairs absorption of fat from the bowel into the body. Alli is the same medication as Xenical, a prescription drug that contains twice the dose of Orlistat (120 mg versus 60 mg for the over-the-counter variety). Alli can be taken up to three times daily with a meal containing fat.

The first question my mother asked was whether Alli would cause weight loss if she continued living the way she currently does. She walks, but only from the bedroom to the front door and to the car. Regardless, she prefers to keep her walking to a minimum. She pointed out that although she consumes "plenty of fat," maybe "the fat would merely pass through me like a vacationer in transit rather than someone who planned to stay permanently" -- her words!

Sadly, my mother is not an ideal candidate for Alli. Without lifestyle changes, the benefits will be limited, and there are side effects. Many patients experience increased gas. Diarrhea is common. More importantly, Alli interferes with the absorption of the fat-soluble vitamins (A, D, E, K). Losing these crucial vitamins can lead to skin abnormalities (vitamin A), bone thinning and an increased risk of fracture (vitamin D) and the potential of bleeding (vitamin K). While vitamin E deficiency is not known to have any adverse effects, a healthy amount of vitamin E from dietary sources may protect against heart attack, stroke and Alzheimer's disease. If you take Alli, you will also have to take fat-soluble vitamin supplements that may not be as valuable as those received in the diet.

Alli will only work in combination with calorie restriction and an appropriate exercise program. For every five pounds lost by the diet, an additional two pounds may be lost because of the drug. But does it work in the long term? Experience with the prescription drug Xenical has not been encouraging. With or without medications, most diets fail. Diets -- the ones founded on simple restriction -- don't work. Only through major lifestyle changes can one effectively lose weight, keep it off and sustain a healthy life. Our traditional concept of "dieting" by clinging to the newest fad or celebrity prescription is doomed to failure.

Beyond the question of sustainability, prescribing Alli flies in the face of recent research that discredits very low-fat diets. A prudent amount of the right fats is important to your health. Monounsaturated fats found in olive and canola oil and omega-3 fatty acids found in fatty fish, nuts and avocados have been linked to a lower risk of heart attack, stroke and Alzheimer's disease. In addition, these fats help decrease risk of cancers, including colon, breast and prostate.

Furthermore, there is some evidence, in animal studies, that a high fat content in the colon, caused by Alli, may predispose patients to precancerous lesions. By preventing all fat absorption, Alli cannot discriminate between good fat and bad fat. Despite the additional weight loss, this may not be good for your health.

Alli is not recommended for anyone under the age of 18, and I would strongly urge that it not be attempted if you are over the age of 70. Older people are more prone to developing nutritional deficiencies that can cause serious problems. Never consider Alli if you have a major chronic disease such as heart, lung, kidney or endocrine disease, including diabetes. Additionally, by impairing fat absorption, Alli may interfere with prescription medications.

Lifestyle is everything. Eat right, avoid excessive starch, consume monounsaturated fats and omega-3 fatty acids in moderation, eat lean meat and fatty fish and consume all the fruits and vegetables you want. Exercise -- the more the better -- and you will never, ever need a pill as a crutch to weight loss.

Lifelong Health by Dr. David Lipschitz: is the author of the book "Breaking the Rules of Aging." To find out more about Dr. David Lipschitz, and read features by other Creators Syndicate writers and cartoonists, visit the Creators Syndicate Web page at [www.creators.com]. More information is available at [www.drdavidhealth.com].