Protein requirements vary based on your activity level, age, and health goals. The baseline recommendation is 0.8 grams per kilogram of body weight daily for sedentary adults. However, if you're physically active, building muscle, or recovering from illness, you'll need more—typically 1.2 to 2.0 grams per kilogram. For a 150-pound person, that's roughly 55-136 grams daily depending on lifestyle.