It's not a bad theory. Interestingly, there is evidence of inputs into the brain reward system that operate independently of sweetness and that perhaps directl

It's not a bad theory. Interestingly, there is evidence of inputs into the brain reward system that operate independently of sweetness and that perhaps directly encode metabolic value: Rodents that lack the ability to taste sweetness prefer caloric sweeteners such as sucrose to noncaloric sweeteners, such as sucralose[1]. Therefore the brain can detect calories more directly. So in the context of this new study, it could be that the brain notices that a certain rate of eating/drinking is correlated with a decreased rate of satiety and concludes that the correct thing to do is to eat more. 1. http://dx.doi.org/10.1016/j.neuron.2008.01.032 http://dx.doi.org/10.1016/j.neuron.2008.01.032