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Amid growing obsession with protein, how much do we need?
It used to be that only fitness buffs and bodybuilders thought about how much protein they were getting. But now, everybody seems to be looking for more of it in their diet, and just about every food product has added protein, from pancakes to popcorn. But how much protein do we really need? Ali Rogin speaks with New York Times health reporter Alice Callahan for more.
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