The fatties around you aren’t fat because they’re eating butter, they’re fat because they are eating mostly slop made from seed oils and high-fructose corn syrup that is so ultra-processed that it is functionally pre-digested so, on top of being insanely calorie dense, they don’t trigger satiety cues the way actual food, like butter, does.
This makes you feel good and eat less junk. Making you lean.