The Institute of Medicine suggests that healthy adults consume daily about 0.4 grams of protein for every pound of body weight. A person weighing 150 pounds would need, for example, about two servings of meat or three eggs each day to be assured of meeting protein requirements. Children and the elderly may require more. Research suggests that bodybuilders require substantially more protein than the average adult. Some scientists are now recommending bodybuilders to consume about 1 gram of protein for every pound of body weight on a daily basis.
Source: Indicator amino acid-derived estimate of dietary protein requirement for male bodybuilders on a nontraining day is several-fold greater than the current recommended dietary allowance. Journal of Nutrition, 2017. And: Protein recommendations for bodybuilders: in this case, more may indeed be better. Journal of Nutrition, 2017.