Fat kids is almost always down to parents. I see it as a form of neglect, which the parents should be sanctioned on. The dog analogy is a good one. If allowed, kids like dogs will eat much more than is good for them. The owner/parent has full responsibilty.
These are different days to when I grew up and my ma actually cooked every night of the week. A lot of mums nowadays don't know how to cook, just heat up salt & sugar laden processed rubbish. Takeaways are a staple now for many folk, rather than a rare treat.
And when I was a kid chocolate biscuits didn't last, and it was a wait