DOC News July 1, 2004
Volume 1 Number 1 p. 14
© 2004 American Diabetes Association
High-Fiber Cereal and Postprandial Insulin
Recently reported research provides yet another reason for consuming
high-fiber breakfast cereal. A group of investigators from the University of
Toronto and St. Michael's Hospital—under funding from cereal maker
General Mills—studied the effect of two ready-to-eat breakfast cereals
on the plasma glucose and insulin responses on human volunteers.
One cereal, Fiber One, is considered a high-fiber choice, while Country
Corn Flakes is a low-fiber cereal. The study included 78 nondiabetic men who
consumed the cereal on two occasions following a 10- to 14-hour fast. Each
volunteer consumed a test meal containing 25 mg of available carbohydrate.
Blood was drawn at regular intervals for 2 hours following the meal.
Among all subjects, mean plasma glucose levels were significantly lower
after the high-fiber meal at 15, 30, 45, and 60 minutes after eating, and
higher than the low-fiber cereal at 90 and 120 minutes. Data from the 43 men
with high fasting plasma insulin (FPI) on screening were compared to those
from the 35 men with normal FPI. Analysis shows that plasma glucose response
was significantly greater among hyperinsulinemic subjects at 60, 90, and 120
minutes, but not in control subjects.
"This study shows that a ready-to-eat breakfast cereal rich in cereal
fiber elicited lower plasma glucose responses than a low-fiber cereal in both
normal and hyperinsulinemic men but reduced postprandial insulin responses
only in the hyperinsulinemic subjects," the authors observed.
"This supports previous assertions that the relative glycemic effects of
carbohydrate foods are the same in different subjects but suggests that the
relative insulinemic effects of foods are not."
Wolever TM, Campbell JE, Geleva D, Anderson GH: High fiber
cereal reduced postprandial insulin responses in hyperinsulinemic but not
normoinsulinemic subjects. Diabetes Care 27: 1281–1285, 2004.[Abstract/Free Full Text]
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