For anyone reading this who is starting a doctorate or is already in one, I provide one bit of advice: TAKE CARE OF YOUR BODY. You're (most likely) far too smart to do otherwise. I share this after an annual physical (annual? OK, it's been 5 years) where I learned I have elevated blood pressure and cholesterol levels. It's nothing out of this world, but geez I'm only 34. And since my father dropped dead from a heart attack less than two years ago, I should probably change my ways.
So don't be an idiot like I've been; stop sitting around, OK?