It’s not just America [1].
Norway’s obesity rate runs at roughly half America’s [2]. But the trend across the world is increasing rates of overweightness, obesity and--most worryingly--child obesity.
[1] https://news.ycombinator.com/item?id=41634611
[2] https://en.m.wikipedia.org/wiki/List_of_countries_by_obesity...
Having read (well, listened to) Attia's excellent OUTLIVE, I've reversed my own (slowly turned bad) trajectory by switching my diet to the basics - all home made meals, making my own breads, lots of milk and eggs, meats (not in excess), exclusively extra virgin oil and pure butter in my cooking (zero blends/veg oil etc), and not buying any (sugar) snacks - combined with exercise. Oh and no alcohol for the past few years either - sacrifices had to be made. :-)
Luckily my own kids are showing zero signs of obesity, they are very healthy.