There are several citations in those posts, and a bazillion in the book I posted below.

Your attitude is all wrong though, and that is what needs fixing, above and beyond your knowledge. You ask straw man questions - you know I'm talking about added sugar. As for oil, why don't you look at the label of any processed food and then do some research on how these oils are produced? You'd discover how much worse americans health has gotten as these processed oils have largely replaced butter and animal fat as sources of lipids.

Also you do not appear familiar with how nutritional studies work and the difficulties of establishing causation. You cannot simply lock someone in a room and force them to only eat certain foods, and it is really really expensive to do longitudinal studies. We really know next to nothing based on controlled experiments on chronic conditions simply because of their limitations - but you combine the correlationary studies with evolutionary theory (especially natural selection) and studies in medical anthropology (as cited in those links) and you have as clear-cut a case as you can get in nutrition.

Groups that don't eat processed crap get cancer and the metabolic syndrome in ridiculously high numbers. Groups that don't eat processed crap don't get these diseases.

Groups that don't eat processed crap, but then suddenly are introduced to sugar and flour find their chronic health conditions going to the shithole. There is not example that I know of the contrary.

That's all the proof I need.