The perfect symbol of society’s growing addiction to sugar isn’t a candy bar or a can of soda. It’s the cupcake: a little ‘treat’ groaning with more sugar than our grandparents would have eaten in a whole month. Middle-class women like to think of sugar addiction as a blue-collar problem, confined to fast food. But they can’t resist biting into a ‘naughty’ cupcake – and they think that, since these cakes have retro charm, it’s fine to feed them to their kids. Sugar addiction is dangerously close to drug addiction: sugar and cocaine excite similar areas of the brain. We read about the problem, but that doesn’t stop us rewarding ourselves with little bursts of sweetness during the day. Until diabetes strikes, that is.