IME overeating whole foods is not impossible but it leaves a distinct and vaguely unpleasant stuffed feeling, unlikely to become a habit. The most I've ever managed is probably in the 3000-3200 kcal range, and that's on days with~40mi of cycling or following a 24-36hr fast.
Contrast with the US "bar food" template of dry starches used as soybean oil sponges. 2-3 bites, minimal chewing, astonishing energy content. Or cinema concessions--1000-2000 kcal easily and people are still in the mood for dinner 90 minutes later.
Lots of: urban hiking, cycling, sprinting
Lots of: fresh meat, seafood, eggs, organs, tubers, starch fruits, vegetables, meat fat, dairy fat, oil fruits
Some: cured meat, dairy protein, sweet fruits, rice, pulses, tree nuts, oil seeds
Minimal: soy, refined proteins, sugar, liquid carbohydrate, grains, refined oils, peanuts