A single-center randomized trial at an academic medical center in Boston, Mass., studied the health effects of popular diets in overweight or obese adults (mean body mass index of 35; range, 27-42) aged 22 to 72 years with known hypertension, poor cholesterol profiles or high fasting blood sugar. A total of 160 participants were randomly assigned to either the Atkins, Zone, Weight Watchers or Ornish diet groups.
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