You sir, are a fuckwit.  I was a "chubby" child until the age of about 11, when I had a bit of a growth spurt, and then a very skinny teenager (who later developed bulimia). It was only at around 12 that I realised that I could say no and eat what I wanted. We had very little junk food in our house (my mum is a doctor and banned soda, chips, chocolate, etc except for special occasions, and we never really had take-out), but being of indian heritage there was a lot of rice and homemade, deep-fried goodness. I know now that I was just eating too much, but back then food was on the table and so I ate it. After I hit my 20s, I actually taught my mum how to cook a bit healthier as well, to help with my dad's cholesterol, but nobody in my family has ever been huge, except me as a young child who didn't put down the bloody fork.