Partially right on the food but absolutely wrong on lifestyle changes over the last few decades. Specifically we are talking youth here, in western countries but evidence also supports places like China with more and more youth neglecting exercise and sports to stay inside and consume digital entertainment instead that only compounds with increasingly unhealthy dietary choices. Increasing sugar and carb intake while neglecting other nutrients and vitamins. Both factors are bad on their own but the effect is multiplicitive when combined. And a third factor with the subculture pushing obese acceptance and trying to present overweight people as being just as healthy as those pursuing atheltic and active lifestyles makes people who have fallen into the trap of sedentary lifestyle eating unhealthy foods regularly even less likely to try and change and improve themself, many people giving up cause its hard to break free of something they know and gives them comfort, even if its literally killing them slowly.