Breast milk is gaining traction as the latest performance aid among some bodybuilders. But this particular trend probably does far more harm than good, even outside the “ew” factor. “People think breast milk is good for you because it is a ‘natural’ source of hormones and antibodies and is nutrient dense and high in protein,” says Kelly Pritchett, R.D., a spokesperson for the Academy of Nutrition and Dietetics. “But there is no scientific evidence that suggests there are benefits for adults.” And since it’s a bodily fluid, breast milk can carry disease or infections. A far smarter option: Rely on foods such as Greek yogurt, cottage cheese, nut butters, and chocolate milk to amp up your results, she says.