Do you? I dare say, if you're a parent, you probably don't. "Eat your carrots, then we'll see about pudding", says she who had a flapjack for lunch. "If you don't get to bed you won't be ready for school in the morning". Pah! From she who regularly has a laptop on her person 2 hours past the headlines being read which she promised to go up after. As for, "too much chocolate will spoil your teeth" - don't get me started, and sharing - moi?? Forget it!
Then there's my job, which definitely gives me a wholly unfair disadvantage, as I end up preaching rather a lot. "Phoebe Doyle finds out about surfing, eating for vitality, running back- to-back marathons, being a goddamn saint!!" go the strap-lines. Yeah, she does. Largely from the comfort of her desk, getting tired at the very prospect!
So do you practise what you preach?