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American Journal of Clinical Nutrition, Vol. 85, No. 6, 1465-1477, June 2007
© 2007 American Society for Nutrition


ORIGINAL RESEARCH COMMUNICATION

Dietary energy density in the treatment of obesity: a year-long trial comparing 2 weight-loss diets1,2,3

Julia A Ello-Martin, Liane S Roe, Jenny H Ledikwe, Amanda M Beach and Barbara J Rolls

1 From the Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA

Background: Consuming foods low in energy density (kcal/g) decreases energy intake over several days, but the effectiveness of this strategy for weight loss has not been tested.

Objective: The effects on weight loss of 2 strategies for reducing the energy density of the diet were compared over 1 y.

Design: Obese women (n = 97) were randomly assigned to groups counseled either to reduce their fat intake (RF group) or to reduce their fat intake and increase their intake of water-rich foods, particularly fruit and vegetables (RF+FV group). No goals for energy or fat intake were assigned; the subjects were instructed to eat ad libitum amounts of food while following the principles of their diet.

Results: After 1 y, study completers (n = 71) in both groups had significant decreases in body weight (P < 0.0001). Subjects in the RF+FV group, however, had a significantly different pattern of weight loss (P = 0.002) than did subjects in the RF group. After 1 y, the RF+FV group lost 7.9 ± 0.9 kg and the RF group lost 6.4 ± 0.9 kg. Analysis of all randomly assigned subjects also showed a different pattern of weight loss between groups (P = 0.021). Diet records indicated that both groups had similar reductions in fat intake. The RF+FV group, however, had a lower dietary energy density than did the RF group (P = 0.019) as the result of consuming a greater weight of food (P = 0.025), especially fruit and vegetables (P = 0.037). The RF+FV group also reported less hunger (P = 0.003).

Conclusion: Reducing dietary energy density, particularly by combining increased fruit and vegetable intakes with decreased fat intake, is an effective strategy for managing body weight while controlling hunger.

Key Words: Energy density • fruit and vegetables • water-rich foods • fat intake • obesity • weight management




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