"One of the main reasons for caffeine giving you a wake-up call is that it forces the liver to hydrolise glycogen into glucose." (src) Glycogen "is the main form of carbohydrate storage in animals and occurs primarily in the liver and muscle tissue." (src) Granted those two sources are not good references. I need to do additional research. However, if true, would diet caffeinated beverages not work for diabetics (since the caffeine increases their sugar level)? Also, would caffeinated beverages degrade athletic performance by depleting your muscle glycogen supplies? More investigation is called for. Any insight anyone?