Effect of test meals of varying dietary fiber content on plasma insulin and glucose response
1981
Potter, Joan G. | Coffman, Kathryn P. | Reid, Robert L. | Krall, John M. | Albrink, Margaret J.
Dietary fiber lessened insulin response to a high carbohydrate meal in 8 healthy males, 22-45 years old. Subjects were fed meals of identical protein, fat and carbohydrate content but of 4 different fiber contents; the 75 g of carbohydrate was given either as liquid glucose formula (containing no dietary fiber), brown rice (2.8 g fiber), pinto beans (16.2 g fiber) or All Bran (18 g fiber). The degree of insulin response inversely correlated with fiber content of the meal. Insulin and glucose responses were highest in subjects fed glucose formula in meals, and lowest when meals containing All Bran or pinto beans were eaten. By blunting the insulin response to glucose challenge, high-fiber diets may result in more stable triglyceride concentration and metabolic state, and thus may be therapeutic in diseases in which excessive insulin response is a factor such as atherosclerosis, obesity and hypertriglyceridemia. However, the mechanisms by which dietary fiber dampens insulin response are not yet known.
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