Pollan's In Defense of Food is a fascinating treatise on eating and food, taking as its central tenet, "Eat food, mostly plants, not too much," and cutting through all the "nutritionism" science that proposes to feed us on individual molecules instead of whole food. Link (Thanks, Avi!)
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.