There is a 40-something aerobics instructor in a Dallas suburb whose cholesterol level is so low-a sixth that of a normal person-that scientists think she is neatly certain to be spared heart disease, no matter what she eats. In Berlin, Germany a small child arrived at the hospital with amazingly well-developed muscles. At the age of 4 he could hold a 7-pound dumbbell in each of his outstretched hands.
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