Fresh clues pointing to causes of heart disease appear regularly, and new styles in preventive medicine follow inevitably. Researchers have urged programs of regular exercise and have warned against smoking. Doctors have spelled out the dangers of excess weight; others have worried about weight fluctuation caused by repeated crash diets. More recently, physicians have concentrated on cholesterol and other fats. Now they have tracked down another apparent culprit.
After a six-year study of community health patterns in a small Michigan city, a team of University of Michigan scientists found that blood sugar levels provide a...
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