Protein in NutritionProtein is an improtant part of a balanced diet, because it provides a person with essential amino acids that the human body cannot manufacture itself. The most recent recommendations prescribe that adult women should consume 46 grams of protein daily to avoid a deficiency, while adult men need at least 56 grams per day. Additional protein is needed for growing children, those who are pregnant, or preparing or recovering from illness, trauma, or surgery.