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[–]TemporarilyDeceased 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

If I can drink 8 double espressos in an evening and go to bed like nothing happened, caffeine immunity seems likely. There's a protein responsible for metabolizing caffeine. If you have too much or none at all, you can be immune to caffeine. Interestingly, it is the same protein that metabolizes a number of common pain killers and the results are similar which really sucks when I have serious pain to deal with.

HFCS is a great point. Specifically avoiding that may give me the same feeling as avoiding all added sugars... and I can still have (some) chocolate.