High fructose is bad, and studies do show that. It has a direct relation to Satiety and Insulin. So obviously if you dont get satisfied youll eat more and inslin is related to diabtes, so the correlation btw rise in high frusctose with diabetes/obesity is clear. Also Rat studies show that when one is fed sugar/glucose and the other high fructose the rat that was fed high fructose got way fat and the other not.