Data on 25 healthy participants who were given about 1,000 excess calories daily showed that those who ate a low-protein diet gained less weight than those who either had a moderate- or high-protein diet. However, those in the low-protein group stored more than 90% of their extra calories as fat and lost muscle mass, while those who ate more protein gained both fat and lean muscle. The findings appear in the Journal of the American Medical Association.

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