The study centered on 270 men and women who were randomly assigned to a low-carbohydrate diet or a low-fat diet for two years. Those on the low-carb diet were told to limit carbohydrates and eat foods high in fat and protein. Those on the low-fat diet cut back on calories and fat and limited protein to about 15% of calories from protein, 30% from fat and 55% from carbohydrate.

Foods such as jelly that are high in sugar were discouraged on the low-carb diet, and high-carb foods such as bagels were banned on the low-carb diet.

Researchers surveyed participants about how often they craved sweets, high-fat foods, carbohydrates and starches and fast-food fats. Participants also were asked about their preferences for certain foods -- this was used to measure how much they liked the foods that were restricted from their diets.

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