I remember years ago watching an interview with a very successful sportsman, whose parents had also been successful in sport. He was asked how much less work he’d had to do, coming into the sport with what was obviously a genetic advantage. His answer was memorable: “Sure, I have the genes to be good in this sport, but if all I did was sit around at home doing jigsaw puzzles, the genes wouldn’t make one jot of difference.”
Okay, so we’re not all world-class sportsmen here – but there’s a powerful grain of truth in his response. Good genes didn’t make him a champion – they only helped. Doing all the hard work was what made him a champion. In terms of the causes of obesity, the same principle applies – genetics make a contribution, but for most of us, they’re not the beginning and end of the story. Other factors also play a part. Some of those factors might have no relationship to the genes, but others might have a direct effect.