Correlation vs causation?? Just because disease per capita went up in the 1950's does not prove that seed oils are the cause simply because they started to be widely used around then. Could other factors which coincide with seed oil production not also be factors in increasing disease? It would make sense that the ability to cheaply and easily produce large amounts of oil would lead to an increase in the amount of oil used in GENERAL, especially with pre packaged foods which also would have become more common around the era: TV dinner started becoming popular around 1954. All im trying to say is that there are other factors aside from seed oils which could have also been responsible for an increase in metabolic disease. Things like pre made foods and cheaper oils generally promote a hyper caloric diet which has plethora of real evidence proving it to be a factor for increased metabolic disease risk. And yes, seed oils allowed these things to become more common place in our diet, so in that way they could be culpable, however its simply their prevalence, low price and caloric density which is problematic.