I always assumed it was we are taking in more and more high fructose corn syrup which leads to the disease.
Get rid of that and watch the disease nearly go away.
I was idly watching a YouTube travel vid, and noticed easily 80% or more of virtually everyone in the informal group was overweight, obese, or close to morbidly obese. I suppose that’s because the latter group doesn’t to on travel tours.
Also watch a lot of older vids. Nary a fatty to be seen. Where did all the fat people come from??