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Your study showed that people who ate 20% of their calories as protein had no bone loss (or minimal bone loss), so why does your doctor recommend almost twice that? You can get your protein balance measured (by testing what comes out in the urine and feces) to determine your actual needs. The RDA is supposed to be adequate for 97.5% of the population - .83 g/kg. The median requirement is .65 g/kg.
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