Author M. Kushner explains: Once a medical study was published on the application of caffeine for treating Parkinson's disease, it stirred up a lot of controversy. However, in my opinion, caffeine cannot help without causing harm. Over doing caffeine takes away your dopamine, as I illustrate in my book titled, anequot;The Truth About Caffeineanequot;. An individual will continue to want bigger quantities of caffeine, no matter what amount he started consuming. As with any drug, the body quickly discovers how to render caffeine's effects void, demanding larger quantities to feel any further stimulation. However, high levels of caffeine can be dangerous and even fatal.