Whilst I haven't done the research to back up such a strong statement, I feel that this form of childhood conditioning is strong & damaging enough to qualify as abusive parenting (semi-forced feeding + impact in later life). Doubling up with sugary rewards (dessert) if they force themselves to eat too much in the first place surely makes it even worse.

Of course, it's not the only factor that leads to obesity, but it's extremely outdated and idiotic practice.