It's definitely more complex than that. I'd say we have an obesity epidemic because of social disunity born from diversity and corporate amorality born from a lack of concern for the disparate under classes mega corp CEOs are disgusted by. The simpler truth is that we developed our OG food pyramid from a scarcity mindset and most of our food habits come from a scarcity mindset. Ultra cheap junk food is probably good for venezuela but we have 0 reason for not banning HFCS other than the corruption of lobbying and the bogeyman of dust explosions. We all look at the fat acceptance movement and cringe but through passive fat acceptance obesity was normalized by the 90s, not by some great effort but by the vast majority of society growing decadent and tolerant, cowed and afraid of judging others because their egos or their achievements were too fragile to stand up to judgement. Society began abandoning all standards through mass personal cowardice. Because cowardice was convenient, people feed kids junkfood because it was convenient, people kept quiet about the decline of our civilization because the consequences of speaking out were inconvenient. I wish this was all as simple as telling fatties to eat less and workout but in the real world its been proven that our dietary problems have created epigenetic and other health consequences, our social malaise has caused economic troubles which re-feed the obesity epidemic. Now metastasized decadence has come to resist us educating the youth to prevent obesity through poor diet and low self opinion. Hell the endocrine poisoning of our society feeds into the obesity problem. The high sugar diet we expose children to feeds gut bacteria which will release chemicals to make them crave more sugar and cause a feedback loop of weight gain and an inability to controll their impulses and sabotage their ability to delay gratification over their lives. Tree huggers should care because the grains, sugars, and excess body weight itself are each wasting an obscene amount of fuel. The solution is going to require people to develop as people, admit their flaws, gain control over their weaknesses and cultivate personal strength and convictions, and we all know that shit ain't happening so we're just gonna have to restrict the offending components of modern diets by legislation, specifically high fructose corn syrup and sugared drinks being available to children. Otherwise were waiting on some miracle of modern medicine.