Nutrition experts who were asked by U.S. News & World Report to rank the safety of 29 popular diets gave high scores to the DASH, TLC, Mediterranean, Mayo Clinic and Volumetrics diets. Registered dietitian Andrea Giancoli, a member of the panel, said the diets that got high safety and nutrition scores are similar to one another -- all focus on vegetables, fruits and whole grains with smaller portions of lean protein, nonfat dairy and healthy fats.

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