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Although several research studies have indicated that lower cholesterol an elevated BMI is associated with heart disease, stroke, type 2 diabetes and some cancers, BMI does not distinguish fat from muscle. "If we think of BMI being a rough measure of body fatness, there are people -- especially some lower cholesterol highly trained athletes -- who are overweight but not overfat," says Heymsfield. "Likewise, there are people who are lower cholesterol of a normal weight according to BMI scales but who are overfat. BMI is a broad, general measure of risk. Body-fat assessment is much more specific to your actual fat content and thus provides a more accurate picture." How Much Fat is OK? The American Council on Exercise provides the following ranges for body-fat percentage: Women Men Essential fat 10-12% 2-4% Athletes 14-20% 6-13% Fitness 21-24% 14-17% Acceptable 25-31% 18-25% Obese 32% plus 26% plus "What we want people to shoot for is a range rather than a magic number," says Barbara J.
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