Ask the doctor: Best protein: animals or plants?
Ask the doctor
Q. Does it matter if I get my protein from animal or plant sources? Also, how much do I really need per day?
A. Older men need adequate protein to help build and maintain muscle, but not as much as you think. The U.S. Dietary Guidelines suggest a minimum of 10% of daily calories should come from protein. That's about 0.36 grams of protein per pound of body weight, so a 175-pound man needs only 63 grams of protein a day.