The general algorithm that more activity, better quality food and less total food will lead to weight decrease holds for even those unfortunate individuals who

The general algorithm that more activity, better quality food and less total food will lead to weight decrease holds for even those unfortunate individuals who have genetic disadvantages and/or a history of obesity. Yes, they may need to do much more activity and eat much less food or in different ratios than others to see results, but that doesn't change the fact that the same algorithm is: 1. the only known way to make progress, 2. well understood. I was trying to sidestep the very issue (and same old tired conversation) you're trying to avoid: blaming individuals. Because while it's arguable that a given hypothetical person might be overweight due their own choices and failings, it's next to impossible to argue that massive society-wide changes in health, in a single generation, are simply the result of huge swaths of a society all making the same bad personal decision, all at the same time.