Penn State researchers shows that diets focusing on foods that are low in calorie density can promote healthy weight loss while helping people to control hunger.

Foods that are high in water and low in fat such as fruits, vegetables, soup, lean meat, and low-fat dairy products are low in calorie density and provide few calories per bite.

Eating a diet that is low in calorie density allows people to eat satisfying portions of food, and this may decrease feelings of hunger and deprivation while reducing calories said Dr. Julia A. Ello-Martin, who conducted the study as part of her doctoral dissertation in the College of Health and Human Development at Penn State. Previously, little was known about the influence of diets low in calorie density on body weight.

Such diets are known to reduce the intake of calories in the short term, but their role in promoting weight loss over the long term was not clear, said Dr. Barbara J. Rolls, who directed the study and who holds the Helen A. Guthrie Chair of Nutritional Sciences at Penn State.

We have now shown that choosing foods that are low in calorie density helps in losing weight, without the restrictive messages of other weight loss diets, explained Ello-Martin, whose findings appear in the June 2007 issue of the American Journal of Clinical Nutrition.

The researchers compared the effects of two diets one reduced in fat, the other high in water-rich foods as well as reduced in fat in 71 obese women aged 22 to 60. The participants were taught by dietitians to make appropriate food choices for a diet low in calorie density, but unlike most diets, they were not assigned daily limits for calories.

At the end of one year, women in both groups showed significant weight loss as well as a decrease in the calorie density of their diets. However, women who added water-rich foods to their diets lost more weight during the first six months of the study than those who
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