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Oh Dear I agree that drug addiction is more powerful and requires assistance. I gave up smoking. Still partial to the odd sweet treat and sugary drinks but would prefer they were inaccessible as I lack will power! I believe scientific evidence proves the input=output case. I've seen some fascinating documentaries about this. One twin who simply has a tendency to fidget more can end up stones lighter than his identical twin. It is only natural for people to overeat and under exercise as these are states of comfort in the modern world. Therefore most people need to make conscious choices about what they eat and how much they move about in order to maintain a healthy body condition. In my experience the one or two lessons on nutrition at primary school were far outweighed by the everyday peer pressure at lunchtimes and teachers do not often practice what they preach so they sometimes give out mixed messages unfortunately. But that's nothing compared to secondary school with the temptations of the canteen, tuck shop and vending machines. Not to mention the endless cake sales!