"Because they couldn't afford to eat more."

But people differ in their incomes. While there always were fat rich people, if food prices were the limiting factor, your average noble from the House of Lords of 1930 would be as fat as average people are today. And yet if you look at those black and white photos of important politicians, businesspeople etc., they were way less fat than an average contemporary student.

This is the Pacific War Council in the early 1940s. Do you believe that those people, decision makers whose decisions affected lives of millions, couldn't afford to eat ad libitum?

https://en.wikipedia.org/wiki/Edward_Wood,_1st_Earl_of_Halif...

Today, they would weigh +15 kg each at least, and asking their doctors for tirzepatide.

Guatemala (arbitrary choice) spent 35% of their income on food in 2016, but 66% were overweight or obese.

I don't know what's causing obesity, but it doesn't seem to be income, given everyone worldwide exploded into fatness around 1980.

And I'm not satisfied with flimsy hypotheses, such as a historically unprecedented worldwide diminution in human "willpower."

https://opendataforafrica.org/atlas/Guatemala/topics/Food-Se... https://data.worldobesity.org/country/guatemala-85/#data_tre...