Woody Harrelson would like to contribute:
"I was on a bus and some girl sees me blowing my nose," Harrelson is saying of his early years trying to make it as an actor in New York. "I had acne all over my face, which I'd had for years and years. And she's like: 'Hey, you're lactose intolerant. If you quit dairy, all these symptoms you got will be gone in three days.' I was like twenty-four. And I was like, No way. But three days later: gone."
He also doesn't eat sugar or flour.