1.6 Grams of Protein a Day Per Kilogram of Weight
To answer the simplest question of whether taking in more protein during weight training led to larger increases in muscle size and strength, the researchers added all of the results together.
[...]
But those who did ramp up their protein gained an extra 10 percent or so in strength and about 25 percent in muscle mass compared to the control groups.
The researchers also looked for the sweet spot for protein intake, which turned out to be about 1.6 grams of protein per kilogram of body weight per day. In practical terms, that would amount to about 130 grams of protein a day for a 175-pound man. (A chicken breast has about 45 grams of protein.)
Beyond that point, more protein did not result in more muscle benefits.
Notes:
Folksonomies: health strength longevity
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Lift Weights, Eat More Protein, Especially if You’re Over 40