Obesity is simple, if you take in more energy than your body expends you will put on weight it's a natural thing for when time are hard, there comes a point where it is damaging for your overall health weight to carry to energy expended, however there has always been larger people and not so large people, so what I fail to understand why it is now an issue, the issue if there is one is with us as parents and consumers, we allowed it to happen, most of my family is larger than I am but most of my family is older than me, as for smaller portions when younger yea it was the case but i always remember being hungry but maybe from the energy expended whilst out or the fact I was growing.