Project

My friend and I were assigned a science fair project for biology. We are thinking of doing an experiment that involves consuming caffeine, but we are not sure of what the purpose/problem should be. Anyone have any suggestions?

Question: If caffeine doesn't seem to do anything to you (i.e. you can have it right before going to sleep), does it still hurt you? Like messing with my circadian rhythm, causing undesirable long-term effects, etc.

I'm mainly concerned regarding the difference between Coca-Cola with vs. without caffeine, as I don't drink Coffee, but I love Coca-Cola, and while it's supposed to be better without caffeine, the truth is it tastes better with.