"Toffee Crisp was my downfall. I once ate five at a sitting." He wasn't fat, he says, because he was unhappy, just self-indulgent. "Do you really need that third helping, Harry?" his mother would say, but leave it at that. "My parents didn't overfeed me, nor did they make an issue of it. That's when things go wrong. It doesn't have to be a problem for children to be fat, but it does affect you: you aren't as happy in that skin."