Is it true that soy is harmful in excess to boys?

Hell no. "excess'' is always good. Oh, i see; you are right. Moderation. Yeah, don't gamble with their precious, irreplaceable lives. I agree; even girls. You r a smart cookie.
Define excess ?! Since many oriental cultures use soy beans as one of their major protein sources I am truly skeptical to the cult myths that soy is bad. Or that soy will turn boys too feminine, or whatever. Look up tofu and explore the benefits listen.