PETA has a message for Michael Moore: You’re the Sicko. The animal-rights group is blasting the filmmaker as a hypocrite for criticizing the U.S. healthcare system in his new documentary, “Sicko,” because they say he’s in such poor health himself. “There’s an elephant in the room, and it is you,” PETA president Ingrid Newkirk wrote in a letter to Moore. Newkirk urged the rotund Moore to become a vegetarian, which many nutritionists say is a good way to lose weight, and visit PETA’s Web site GoVeg.com for veggie recipes. Writes Newkirk: “As they say at Nike (sorry!): ‘Just do it.”