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Sports nutritional supplements are the hottest-selling nutritional products on the market today -- racking up hundreds of millions in sales each year, as aging yuppies snap them up, eager to slow the aging process and deep their youthful edge. But as Dateline's investigation revealed, while supplement makers spend millions to cultivate an image of high-tech, scientific effectiveness, they hide this secret: sports supplements don't work any better than a balanced diet and old-fashioned exercise. (October 6, 1996)