Is that a genuine question Mark or are you just having a cheap, smug laugh at the fat people? In case it was genuine, here is an answer for you. 90% of diets fail, because as soon as the dieter stops the artificial way of eating that diets impose, the weight goes back on - with extra because dieting messes up the metabolism. Therefore it's much better to prevent obesity wherever possible, through teaching good eating and exercise habits to young people. Hence all the "fuss" as you call it about obesity.