How do they stay thin?

How come all these great chefs like Michael Chiarello, Rachel Ray, Bobby Flay, Dave Lieberman, and Ingrid Hoffman are all tiny....they look like they never eat any of the food they cook. Now Paula Deen and Ina Garten and Mario Batali and Emeril Lage....they look like they actually eat their own cooking! How do these other cooks stay so thin? And speaking of cooks who eat their own food....is Justin Wilson still alive? I miss seeing him.