...don't we? According to [0], the amount of food (by energy intake) people get is very diverse worldwide. People can survive famine situations for a long time, and people' problems with obesity is linked to exactly those survival genes.

Granted, some animals are much better at it, crocodiles and bears and stuff can go without food for months.

[0] https://en.wikipedia.org/wiki/List_of_countries_by_food_ener...