It is the fat profile of seed oils that is the problem, at least in my investigations. We are consuming certain fats in very high quantities now that we never did historically.
it's possible, but it seems a bit far-fetched, given the enormous variety of fats used in different traditional diets that didn't cause obesity epidemics
there was a lot of excitement about ten years ago that the ratio of n-6 unsaturated fats to n-3 unsaturated fats might be the key, but that doesn't seem to have panned out
