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The Physicians Committee



BREAKING MEDICAL NEWS October 31, 2003

Whole Grains Improve Insulin Sensitivity

October 31, 2003

Whole grains improve insulin sensitivity, according to a study appearing in tomorrow’s American Journal of Clinical Nutrition. Insulin sensitivity is a measure of the body’s efficiency in clearing sugar from the bloodstream. Individuals with better insulin sensitivity have reduced risk of diabetes, heart disease, stroke, and cancer.

The Insulin Resistance and Atherosclerosis Study included 978 middle-aged adults with either normal or impaired glucose tolerance. Participants whose diets included the most whole-grain foods--dark breads (e.g., whole wheat, rye, pumpernickel), bran or granola cereals, and cooked cereals--had significantly better insulin sensitivity, compared to those who tended to skip these foods.

This effect of whole grains appears to come mostly from their fiber and magnesium. However, evidence suggests that the short-chain fatty acids produced as grains are digested also contribute to the effect.

Liese AD, Roach AK, Sparks KC, Marquart L, D’Agostino RB Jr., Mayer-Davis EJ. Whole-grain intake and insulin sensitivity: the Insulin Resistance Atherosclerosis Study. Am J Clin Nutr. 2003;78:965-971.

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