Caffeine has been advocated to serve as a weight loss aid for its ability to promote favorable changes in energy balance. It stimulates the sympathetic nervous system which works to suppress hunger and decrease appetite thereby reducing energy intake while also increasing energy expenditure, lipolysis, and fat oxidation. Acting as the main metabolite of caffeine, paraxanthine has been studied to provide the same benefits as compared to placebo, but without the pitfalls associated with caffeine.*