Levi Johnston's diet tip for his upcoming revealing Playgirl shoot? Eat moose.

Word is that Levi Johnston is on a strict high-protein diet to prep for his alleged Playgirl photo shoot. 

And naturally, he's eating a lot of moose. Moose that he's personally hunted and killed.

No soy protein for this boy.

"Moose meat is very good for you, high in protein and very lean," his trainer, Marvin Jones, tells People. "He's an avid hunter, so he has his own."

In addition to eating mucho moose, Johnston works out three hours a day -- six days a week -- in an Alaska gym.

But his trainer says Levi worked so hard that he got sick during his second week of training for Playgirl.

Hey, being a celebrity is hard work. You sure you're up for this, Levi?

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