If you're ancestrally from a tropical climate, the biggest and most efficient fat sources (apart from animals) were coconuts and other highly saturated (sometimes monounsaturated) crops

also, even the animals from tropical climates have lower total fat levels, and within that fat a higher proportion of saturated fat

anyway the issue is more about the person's individual phenotype and the total amount of polyfats. I still eat some nuts and seeds, but I feel awful when I resume eating food cooked in "vegetable oil". (or any high polyfat oil)

I also feel awful eating food cooked in pork grease, but solid pork meat is fine. This is probably because the grease contains a much higher amount of polyfats, while the fat left over on the solid meat is mostly monounsaturated/saturated. (polyfats are liquid at room temperature and even very cold temps, while saturated fats are solid)

Whole foods are definitely different from eating chemically separated oils, they have higher vitamin E which ameliorates the inflammatory effects of polyfats (which turn into prostaglandins especially in African and Indian people's bodies), and they also have much less total fat in general