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800 calories a day less and women never missed them

When Penn State researchers made small changes in young women's meals -- reducing calorie density by 30 percent and serving size by just 25 percent -- the women ate 800 calories less per day and felt just as full and satisfied.

Dr. Barbara Rolls, who holds the Guthrie Chair of Nutrition in Penn State's College of Health and Human Development, directed the study. She says, "We lowered the energy density, or calories per gram, of the participants' meals by incorporating more vegetables and fruit in recipes and also using food products reduced in fat and sugar. The subjects found the smaller, lower energy density meals just as palatable, filling and satisfying as the big, high calorie menu items -- and they didn't compensate for lowered intake on the first day by eating more on the second day of the study."

Rolls detailed the study results Monday, Nov. 15 at the annual meeting of the North American Association for the Study of Obesity (NAASO) in Las Vegas. Her co-authors are Liane Roe, research nutritionist, and Jennifer S. Meengs, research technologist.

In the study, on two consecutive days in each of four weeks, 24 young women, ages 19 to 35, ate breakfast, lunch and dinner in Penn State's Laboratory for the Study of Human Ingestive Behavior. They also received evening snacks to take home.

The same two-day menu was served in all weeks but the foods were varied in energy density and portion size. The meals were either standard or reduced by 30 percent in energy density or reduced 25 percent in portion size or both.

Reducing the energy density of foods by 30 percent led to a 23 percent decrease in daily calorie intake. Reducing the portion size by 25 percent led to a 12 percent decrease in calorie intake. Despite the large variation in intake, there were no significant differences in ratings of hunger or fullness over the two days.

Rolls notes, "This study shows that even small reductions
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Contact: Barbara Hale
bah@psu.edu
814-865-9481
Penn State
15-Nov-2004


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