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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