alt Hacker NewsOnly strange because everyone who likes to be holier-than-thou claims the problem is all about stuffing your face with candy. Your number is off by as much as a factor of 10, by the way. The average American gains a pound a year or so, which is 1% or even less of a surplus.
Your conclusion is correct but the average weight gain is rather misleading. If people were actually gaining weight at that rate, then obesity would take decades to develop. In reality it's really more of an S curve where people quickly put on a lot of weight and then it levels off afterwards. So the overwhelming majority have stable weight, but a small fraction have very quickly increasing rates at any given time, leading to a small positive average.