WHEN STUDIES CONFOUND

Since January, major government studies and reports in prominent medical journals have overturned some long-held assumptions about health and diet, questioning the effectiveness of low-fat diets for preventing heart disease among women; the usefulness of vitamin D and calcium supplements; and the benefits of glucosamine and chondroitin for arthritis sufferers. In March, The Wall Street Journal published

Since January, major government studies and reports in prominent medical journals have overturned some long-held assumptions about health and diet, questioning the effectiveness of low-fat diets for preventing heart disease among women; the usefulness of vitamin D and calcium supplements; and the benefits of glucosamine and chondroitin for arthritis sufferers. In March, The Wall Street Journal published a feature titled "The Case Against Vitamins," which cited "a troubling body of research ..

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