Because it's carbohydrate that tells the beta cells to produce insulin, the more carbs you eat, the higher your insulin levels, at least until you "burn out" your pancreas and are producing hardly any insulin at all. And constantly snacking keeps your insulin levels high all day long.
If we're expected to take any dietary advice from our physicians at all, we need physicians who have a deeper understanding of nutrition than "this diet good; that diet bad." Getting harmful advice from a physician makes us cynical about their abilities in general, and we might also ignore good advice about getting screened for cancer or getting pneumonia or flu shots.
Nutrition is complex, but so is general medicine. Anyone capable of getting an M.D. degree should be able to deal with the compexities of diets. Medical schools need to emphasize the importance of understanding the fine points of dietary advice. And physicians in training need to listen and remember.
More of Gretchen's posts:
Low-carb or not? Old Ideas and the ADA
Type 1 vs. Type 2: Can't we all just get along?
Need a new diet? A humorous take on diabetes diets.
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