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【medical-news】饮食减少糖尿病风险与否
July 28, 2008 -- Diabetes is on the rise in the U.S, and three new studies shed more light on how diet affects your odds of developing type 2 diabetes.
Each study covers a different aspect of diet. Together, the studies show that diabetes risk may rise if you drink too many sodas and sweetened fruit drinks, fall if you eat more fruits and vegetables, and may not be affected by how much fat you eat.
But there's another key theme that runs through the studies: There's no getting around calories. Blow your calorie budget and you'll gain weight, which makes type 2 diabetes more likely.
"Until we have more information, we have to assume that calories trump everything else, and that our No. 1 goal for the reduction of new cases of type 2 diabetes should be to reduce the intake of high-energy, low-benefit foods," especially in young people at high risk of diabetes, write Mark Feinglos, MD, CM, and Susan Totten, RD, from Duke University Medical Center.
Here's a quick look at each of the studies, published with Feinglos and Totten's commentary in the Archives of Internal Medicine.
Increased Risk With Sugary Drinks?
Sugary sodas and fruit drinks may be linked to increased risk of type 2 diabetes in African- American women, the first study shows.
The study included nearly 44,000 African-American women who were followed from 1995 to 2005. They completed dietary surveys when the study began and again in 2001.
None of the women had diabetes at the study's start; a decade later, the group had reported 2,713 new cases of type 2 diabetes.
Women who drank at least two regular soft drinks per day were 24% more likely to be diagnosed with type 2 diabetes than women who drank less than one soft drink per month. Weight gain appeared to account for some of the increased risk in soda drinkers.
Women who drank at least two sweetened fruit drinks per day were 31% more likely to be diagnosed with type 2 diabetes than women who drank less than one sweetened fruit drink per day, the study also states.
The researchers, who included Julie Palmer, ScD, of Boston University, note that sweetened fruit drinks "are often marketed as a healthier alternative to soft drinks" but may have at least as many calories as a regular soda.
Diet sodas, orange juice, and grapefruit juice weren't linked to increased risk of diabetes. It's possible that the natural sugars contained in orange and grapefruit juice may have different metabolic effects than the high-fructose corn syrup that is added to regular sodas and most sweetened beverages.
Beverage Industry Reaction
WebMD contacted the American Beverage Association, the trade group representing companies that make and distribute nonalcoholic beverages in the U.S, for its response to the study.
"We agree that type 2 diabetes is an important public health problem, particularly among African- American women, but it is important to recognize that beverage consumption is not an identified risk factor for the disease," says Maureen Storey, PhD, the American Beverage Association's senior vice president for science policy.
Storey points out that the study recommends that women trying to lose weight may find it easier to do so if they switch from regular sodas to diet sodas. She also notes that the study's link between fruit-drink consumption and type 2 diabetes "is very weak or nonexistent. Therefore, avoiding these drinks may have no effect on diabetes risk."
Lastly, Storey says it's not clear whether the researchers controlled for total energy intake -- the total number of calories the women consumed from all sources. An imbalance between energy intake (calories consumed) and energy output (calories burned) can lead to weight gain over time, "and that, aside from family history, is the most important factor in development of type 2 diabetes," says Storey.
Fruits and Vegetables May Cut Diabetes Risk
Eating more fruits and vegetables may cut diabetes risk, according to another study in the journal.
The study included nearly 22,000 adults in Norfolk, England. When the study started, they got a checkup, provided blood samples, and completed a diet and lifestyle survey.
Over the next 12 years, 735 of the participants developed diabetes.
After controlling for multiple other lifestyle factors, including vitamin supplement intake, the diagnosis of diabetes was 62% less likely in people with the highest blood levels of vitamin C and 22% less likely in those with the highest intake of fruits and vegetables. Participants with the highest vitamin C levels ate five to six servings of fruits and vegetables per day.
"Because fruit and vegetables are the main sources of vitamin C, the findings suggest that eating even a small quantity of fruit and vegetables may be beneficial and that the protection against diabetes increases progressively with the quantity of fruits and vegetables consumed," write the researchers, who included Anne-Helen Harding, PhD, of Addenbrooke's Hospital in Cambridge, England.
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作者:admin@医学,生命科学 2011-08-06 05:14
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