Japan is often cited as a proof that a high carbohydrate diet is the solution to avoid chronic diseases. I think it is a misguided belief.
In the 1950s, Ancel Keys considered his hypothesis (dietary fat causes heart disease) confirmed by the example of Japan, where people ate a low-fat diet, had low cholesterol levels, and had very little incidence of heart disease. It is true. It is also true, that at that time, sugar consumption was also very low and carbohydrates (brown rice, millet, buckwheat, etc) were not processed. So, we could also say that the low incidence of heart disease was a result of the lack of sugar and refined carbohydrates in their diet. Of course, Keys paid no attention to sugar consumption.
