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An apple a day keeps the doctor away.

Too much daily soy milk, on the other hand, leads to man boobs.

See Jeremy Piven before and after!

So says nutritionally-challenged Jeremy Piven.

The "Entourage" actor has sworn off the healthful dairy milk substitute -- he chugged 12 cups a day -- because of an unflattering side effect, reports the Huffington Post.

"I was the guy that dabbled in soy milk, but now I've found out soy milk has enough estrogen for me to grow breasts," the Emmy winner explained. "I had to put the soy milk down. It was a very confusing time."

And it's not his first bizarre food-related complaint.

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Earlier this year, he bowed out of a Broadway play crying mercury poisoning. The cause? He says he ate sushi twice a day for 20 years.

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