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Which diet plan is best at promoting sustained weight loss remains a controversial issue. In the A TO Z (Atkins, Traditional, Ornish, Zone) Weight Loss Study, investigators randomized 311 women (age range, 25–50) to one of four diets: Atkins (very low carbohydrate); Zone (low carbohydrate); Traditional (lifestyle, exercise, attitudes, relationships, nutrition [LEARN]; low fat, high carbohydrate); and Ornish (very high carbohydrate). Women in each group received the corresponding diet book and attended eight weekly nutrition classes led by a registered dietician. Dietary intake, physical activity, and anthropometric and metabolic measures were assessed at baseline and at 2, 6, and 12 months.
One-year retention was >75% for all diets. Women lo…