Why are Drs. Roizen and Oz so focused on waist size, not weight? Because pounds only tell you how hefty you are. They don't say a thing about how healthy you are. Waist size does—belly fat is linked to multiple medical problems. So does body mass index, or BMI, a height/weight measure that estimates body fat. The healthier these numbers are, the healthier you are, especially in terms of cardiovascular disease and diabetes.

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