how much protein does the body need a day?
You need protein for your muscles, bones, and the rest of your body. 1  Babies need about 10 grams a day. 2  School-age kids need 19-34 grams a day. 3  Teenage boys need up to 52 grams a day. 4  Teenage girls need 46 grams a day.  Adult men need about 56 grams a day.