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However, athletes trying to build muscle need 0.6 to 0.82 gram of protein per pound of body weight per day, according to a review published in a 2011 edition of the âJournal of Sports Sciences.â For example, a 160-pound man trying to bulk up may need up to 131 grams of protein each day.
The Institute of Medicineâs protein RDAs are calculated using 0.8 grams of protein per kilogram of body weight. This means an adult who weighs 68 kilograms needs at least 54 grams of protein each day. The RDA for pregnant and nursing women is 71 grams of protein per day. Active adults and elderly people likely require more protein than the RDA of 0.8 grams per kilogram.