Answer: I would rather eat some peanut butter or cheese for a protein fix on hectic days, but there isn't anything wrong with a protein supplement if you don't mind the taste and expense. (Just don't go overboard. Mixing in this concentrated source of protein into a homemade smoothie is enough; no need to sprinkle it over everything you eat or drink.) Check out mypyramid.gov to see how much you need. An average 125-pound woman needs only about 5 ounces of protein a day, according to mypyramid.gov, which equals 1 large egg, 1 tablespoon peanut butter, and 3 ounces chicken.