Hi sir I think obesity is a global problem although it's worst in US but it's also a big problem for the world.
A lot of things responsible for this epidemic most of them you covered it can be cured and avoided by proper routine of exercise and controlled diet plan with desciplined eating can be better.
For the case of children it's our full responsibility and we are the culprit if it's not due to thyroid or any hormonal imbalance.
Nice article sir.