Odd you should ask this question. I 've been wondering lately about the energy drinks. You have to understand that at 64 you do feel alittle bummed out from time to time. There are mornings when you wish you had a little more spunk, or at least another hour in the sack. BUT.... after reading the replies of younger folks compaining of jittery and all that... I think I'll stick with a banana, apple, cereal, and two cups of coffee. My daily allowance or maybe I should say tolerance is 2 cups. Beyond that I seldom go, I just don't need anymore. I need no more high than to be 20 feet up with the sun coming up.