Women ate 575 fewer calories per day, a 24 percent decrease in calories, when the calorie density of the food provided to them was 25 percent less than normal according to research from researchers at Pennsylvania State University in University Park, Pennsylvania, USA.

Eating foods that are high in volume, but low in calories—called low energy-density foods—is an effective strategy for losing weight and helping to prevent weight gain according to a study from Barbara Rolls at Penn State University.

Normal weight people who ate 1.5 medium peeled apples, which contained about 125 calories, ate an average of 187 fewer calories at lunch than people who were given applesauce or nothing according to a study from Barbara Rolls at Pennsylvania State University who has written a lot about how eating bulky foods that are low in calories—low calore dense foods—reduces food intake.

Children ate 34 percent more calories when they were given larger portions of lunch that contained more calorie-dense foods according to a study by Jennifer Fisher at the U.S. Department of Agriculture’s Children’s Nutrition Research Center in Houston, Texas and Barbara Rolls at Pennsylvania State University in University Park, Pennsylvania, USA.

The more fat a meal contains, the more calories people eat. This according to a study from researchers at University of Colorado School of Medicine in Denver, Colorado, USA.

When people consumed a diet containing 23.8 percent fat, they consumed an average of 2748 calories per day.

When they consumed a diet containing 32.7 percent fat, they consumed an additional 235 calories for an average of 2748 calories per day.

When they consumed a diet containing 38.1 percent fat, they consumed an additional 270 calories for an average of 3018 calories per day.

“These results show that energy intake increases as dietary fat content increases across the usual range of dietary fat consumed in the United States,” the researcher concluded.

“Even small reductions in dietary fat could help in lowering total energy intake and reducing weight gain in the population.”

People who reduced the calorie-density of their diets the most, by eating lots of fruits and vegetables, lost the most weight according to a a study from Barbara Rolls at The Pennsylvania State University and others.

Women who ate a salad before a meal reduced the calories eaten at that meal by by 7 to 17 percent according to a recent study by Barbara J. Rolls, professor of Nutritional Sciences at Pennsylvania State University in University Park, Pennsylvania, USA.

Patients following a high-carbohydrate, low-calorie-dense diet lost an average of 8.8 pounds according to a study from the University of Alabama at Birmingham EatRight Weight Management Program.

The calorie intake of children 3- to -5 years-old was reduced 389 calories per day, or 14 percent, by reducing the calorie density of breakfast, lunch and their afternoon snack according to a new study from Barbara Rolls and others at Pennsylvania State University in University Park, Pennsylvania, USA.

“Children consumed a consistent weight of foods and beverages over 2 days in both conditions,” the authors noted, thus their calorie intake was reduced.

Barbara Rolls has done a number of studies showing that reducing the calorie density of food reduces calorie intake.

Children ate 18 percent more calories when they were given an entree that was more calorie dense, that is food that contained more calories for a given amount of food, according to a study by Jennifer Fisher at the U.S. Department of Agriculture’s Children’s Nutrition Research Center in Houston, Texas, USA and colleagues.

The best diet, according to Consumer Reports, is “The Volumetrics Eating Plan” by Barbara Rolls, Ph.D., a professor in the department of nutritional sciences at The Pennsylvania State University.

High fat diets tend to increase calorie intake according to a lot of research. However, a high fat diet may not increase calorie intake more than a low fat or medium fat diet provided the calorie density of the foods are similar.

The calorie density of foods, rather than the fat content, affects how much a person eats according to a recent study.