Both carbs and fats will cause mitochondria disfunction at high doses and lead to disease. There are just some of them that do it faster than others as well. I

Both carbs and fats will cause mitochondria disfunction at high doses and lead to disease. There are just some of them that do it faster than others as well. In the 19th century common folk did not have access to the large amount of calories as we do today. Plus there was much lower air pollution, pesticides, etc. To compare someone's health outcomes in the 19th century to someone living today is impossible. So all we can focus on is the now. And today we have an awful lot more people with metabolic disorders walking around.