Macro partitioning

Increasing total protein intake from 0.5 to 3.5 g/kg body weight per day increases lean body mass in a dose-response manner, with the greatest efficiency observed below 1.3 g/kg/day.

To maximize muscle mass, increase your daily protein intake to between 0.5 and 3.5 grams per kilogram of body weight. You will see the biggest gains per gram of protein when you are below 1.3 g/kg. If you are already eating above 1.3 g/kg, adding more protein still helps, but the returns get smaller unless you are also doing resistance training. Aim for this intake consistently over several months.