Can too much tofu be bad for you?

Tofu: Tofu is high in protein. It is a healthy food. It's never bad to eat healthy.

Doubt it: Much of the Japanese food culture is based on tofu/soy and fish. It has thrived for thousands of years with no problems.There are occasional studies that warn men that the estrogen like property of some soy proteins may make them less fertile, but that doesn't seem to hamper those cultures where it is consumed daily.