Soy is great for you.It can fight cancer.No, soy can be bad for you, especially if you’re a guy.It can lead to growth of breasts or lower testosterone levels.These are some of the conflicting statements about soy and its by products.But what is the low down on soy?Is it really good for you or not? According to Karen Collins, M.S., R.D., C.D.: A study of children fed soy protein formula for more than six months showed no hormonal effects. A study of men in their 50s and 60s found that the men who