When I put on weight over Christmas, I tell myself I will burn it off in the summer, when I get out more. When summer comes around, I can’t resist a barbecue and a nice glass of red wine. When I put on weight across the summer, I tell myself I will take it off come September, when I get back to serious business again. The thing is, there is never a time in the future when I can take weight off by simply watching what I eat over a short period of time, so I just have to watch myself all the time. How can I not eat too much, when there is so much good and tasty food around, and when I love my food, as I always have? This chapter considers the misunderstanding that everyone can regulate their appetite and eat only what their share is, for a stable body weight and stable energy balance. It just doesn’t work like that. Some people can very easily overeat without noticeable effect, while many of us cannot and dare not, without putting on weight.