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Source: Nutrition Action
Summary:
64 overweight or obese people average age 67 were assigned to diet only, exercise only, or diet and exercise groups for 16 weeks
Diet only and diet-exercise lost more weight and fat than exercise only group, but diet only lost more muscle than other groups
Both exercise groups used fat stores for energy more than diet only, per article in J. Appl. Physiology
Conclusion: Exercise helps to preserve muscle mass in weight loss programs
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Normal Weight and Excess Fat
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