Hi - I've no idea why he would say that. The broadest scale studies of diets around the world show that populations with high soy intake (primarily these are people in Asia) have health benefits from this, not health risks.
Soy is a bean, a plant food, and one of the foods with the longest histories of human cultivation and consumption.
I rely on sources such as The China Study (T. Colin Campbell) and the Physician's Committee for Responsible Medicine (http://pcrm.org - and you can actually search their site for studies on soy). I'd ask your doc point blank what he thinks of info from these sources, and where he's getting his conflicting info.
I'm not the authority on soy, I just don't like a lot of the really crazy and scary misinformation I see out there. If there is legit info that overrides the heavy hitting studies in favor of soy, I'd certainly take a look.
Best, H
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