Can Whole Grains Help You Lose Belly Fat?

A recent study in the American Journal of Clinical Nutrition showed that a calorie-controlled diet rich in whole grains trimmed extra fat from the waistline of obese subjects.

Study participants who ate all whole grains (in addition to five servings of fruits and vegetables, three servings of low-fat dairy, and two servings of lean meat, fish, or poultry) lost more weight from the abdominal area than another group that ate the same diet, but with all refined grains.

"Eating a diet rich in whole grains while reducing refined carbohydrates changes the glucose and insulin response and makes it easier to mobilize fat stores," says study researcher Penny Kris-Etherton, PhD, RD, a distinguished professor of nutritional sciences at Penn State University.

"Visceral fat is more metabolically active and easier to lose than subcutaneous fat, especially if you have plenty of it and the right conditions are met, such as the ones in our study."

When you eat refined foods like white bread, it triggers a series of events, starting with elevated blood sugar levels followed by an increased insulin response, which can cause fat to be deposited more readily. But eating a diet rich in whole grains (which also tend to be higher in fiber) helps improve insulin sensitivity. This, in turn helps the body more efficiently use blood glucose, lowers blood glucose levels, and reduces fat deposition.

The U.S. Department of Agriculture's 2005 Dietary Guidelines recommends that half of your grain servings come from whole grains.

"Eating whole grains exclusively may be difficult and unrealistic for many people," says Rosenbloom. Instead, she recommends, "work toward consuming more whole grains, as they tend to be high in fiber, which satisfies hunger for longer periods and helps you eat less than refined grains."