I've noticed better heat generation (I was recently able to withstand ocean water for an hour--El Nino helped, but I think I would have normally turned blue anyway. I was hot later for at least 24 hrs. like a reaction to the cold. Carbs are supposed to create heat when the carbon mixes with oxygen, but I've been trying to take it easy on carbs, so it all seems paradoxical. Carb heat must not affect body heat? Whatever the case it seems healthier to me to be able to generate some heat. Mary J.