They eat more kcal than they needed per day. And its not a decline of exercise, its [a recent trend](https://dl.dropbox.com/s/2u8m7b6sp1lqzn3/5762476.jpg) since pre-1990 men would still have ‘slowed down’ with age.
Acceptable portion sizes increased as well as regular snacks. They measured the activity levels and kcal expenditure using doubly labelled water(insanely accurate) of the Hadza, a tribe of modern hunter-gathers that have a rough lifestyle in order to secure food. Comparing with city dwelling desk drivers, the difference in overall expenditure was minimal.
https://today.duke.edu/2019/01/living-caveman-won%E2%80%99t-make-you-thin-it-might-make-you-healthy
If you want to look at trends which still include acceptable portion sizes, then look at the japanese.
tl;dr you really can’t outrun over eating.
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