what is caffeine buildup?
Caffeine works by stimulating the central nervous system (CNS), heart, muscles, and the centers that control blood pressure. Caffeine can raise blood pressure, but might not have this effect in people who use it all the time. Diabetes. 2  Drinking beverages that contain caffeine is linked with a lower risk of developing type 2 diabetes. 3  It appears that the more caffeine that is consumed, the lower the risk. 4  Although caffeine might help prevent type 2 diabetes, it might not be effective in treating type 2 diabetes.