> Obesity. Being overweight is directly correlated with an increased risk for over a dozen cancers. And people are fatter than ever.

Doesn't that just move the question to: why are so many people obese now? Including more obese younger people.

I suspect sugar intake has a drastic impact here. We genuinely have too much of it in everything.

But I kind of doubt there's more sugar in food than there was in the 70s.

Late 80's / early 90's was the war on fat, so companies introduced "low fat" versions of their products that replaced fat with sugar

I'm old enough to remember a war on sugar in the 70s. My mom took us off of Lucky Charms/Fruit Loops for breakfast and starting making her own granola circa 1974. She was reading/hearing lots of stuff about the dangers of sugar in the diet.

Risk in the cohorts we're talking about have tripled or even quadrupled. Obesity has not; prevalence is up 10-20%.