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What about obese adults that used to be obese children?

Regardless of the cause of the obesity epidemic, it should be addressed compassionately and efficaciously. What makes that difficult (at least in the US) is that the most efficacious treatments aren't aligned with how the healthcare system works. Maybe you won't blame being fat on diet and exercise, but there's almost certainly a diet and excercise plan that will make you lose weight.

First-line treatment should be, - Walk/jog 30 min, 3x per week. Pace for a mildly elevated heart rate. - Eliminate super sweet foods from regular diet. No more than 3x per week. This could be VERY hard for sugar-addicted folks, so start small and work up. - Fast occasionally. Intermittent is great, but longer is even better. - Take a multivitamin.

The end goal is to replace your sweet craving with a fat craving and be ok feeling hungry for periods of time.