Childhood in large parts of modern Britain, at any rate, has been replaced by premature adulthood, or rather adolescence. Children grow up very fast but not very far. That is why it is possible for fourteen-year-olds now to establish friendships with twenty-six-year-olds - because they know by the age of fourteen all they are ever going to know.

Obesity is the result of a loss of self-control. Indeed, loss of self-control might be said to be the defining social (or anti-social) characteristic of our age: public drunkenness, excessive gambling, promiscuity and common-or-garden rudeness are all examples of our collective loss of self-control.