Oct 24, - His doctors are suggesting that hormones in fast food may be to blame. Watch: Does Eating Chicken with Hormones Cause Men to Develop Breasts? cows grow fatter faster, has been linked to breast growth in studies. Aug 22, - So why don't they use growth hormones in chickens? The answer is simple: it would be a complete waste of money, chickens don't need them to grow faster. Chickens in a shed aren't really exercising, and the breast is the.