Danica Patrick's Engine Runs on Chocolate Milk

05/08/2009 AT 12:50 PM EDT

What's Danica Patrick's diet secret? Chocolate.

"I want to drink chocolate milk, because chocolate milk is really good for you after you work out. C'mon, who doesn't like chocolate milk?" Patrick says in this video about the making of her Body by Milk ad, which debuts May 11.

Don't believe her? Check out her cover pose in a yellow bikini in Shape magazine's June issue.

As for milk, Patrick, 27, says the mustache ad is something "I've always seen, always noticed, always thought it was so cool and that maybe one day I'd get to do it."

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