Danica McKellar talked about how she lost her baby weight so quickly after giving birth to her son, Draco, in September. Over the weekend at the LA Book Festival, The Wonder Years alum said her diet secret is math, telling fanzine Number Zen, "I don't really have time to eat as I'm too busy working on my math or with Draco . . . It's such a diversion to be constantly thinking of better ways I can teach people math that my hunger is for that really."