I don't think that the videos you posted support your claims, at least not the first one. In the suggested diet, almost 2/3 of the carbohydrates don't come fro

I don't think that the videos you posted support your claims, at least not the first one. In the suggested diet, almost 2/3 of the carbohydrates don't come from sugar. From the foods listed, most of these carbohydrates should come from the oats and the rice. In these foods, the carbohydrates come almost exclusively from starch, which the body splits into glucose. And glucose is the ideal power source for your body, as Lustig shows at 44:52 in the first of the youtube videos you linked. Now, about the suggars, at 1:13:55 in the same video, he states that we "should eat our carbohydrates with fibers, and thats why fruits are ok". The diet in the article contains plenty of fibres, so that should be ok.