To me, it really just depends on a couple variables: the body of the consumer, the drink consumed, and how often you drink it. There has been studies done to show that young children and teenagers should not be drinking things such as Monsters, Red Bull, or any other popular high energy products. I believe it would be in relation to their hearts but I still have yet to find some of that information. Personally, I do not drink these products. Before I was put on thyroid medication, I drank only one Monster and my heart starting to have palpitations and I had this form of lethargy. Now, I am on thyroid replacement medication and these symptoms have exponentialized so I have had no choice but to be the abnormal college student and stay away from the varieties of caffeinated beverages or else...RIP