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Evaluation of an alternating-calorie diet with and without exercise in the treatment of obesity
Hill JO, Schlundt DG, Sbrocco T, Sharp T, Pope-Cordle J, Stetson B, Kaler M, Heim C
The American Journal of Clinical Nutrition 1989 Aug;50(2):248-254
clinical trial
4/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

This study examined the effects of calorie alternation and exercise on weight loss. Moderately obese women (130 to 160% of ideal body weight) were randomly assigned to an alternating- or constant-calorie diet with or without aerobic exercise. Both diets provided an average of 1,200 kcal/d over a 12-wk period; daily intake of subjects in the alternating-diet condition varied in a prescribed pattern from 600 to 1,800 kcal/d. Exercising subjects walked 5 d/wk. All subjects participated in an intensive outpatient behavior-modification program. At the end of the study, exercised subjects had greater reductions in body weight and body fat percentage than did nonexercised subjects. The type of caloric restriction did not affect weight or fat loss. Changes in resting metabolic rate did not differ among groups. Alternating calories was neither beneficial nor detrimental as a weight-loss strategy whereas exercise was clearly beneficial in weight-loss therapy.
Copyright by the American Society for Clinical Nutrition.

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