It's pretty easy to not know that coffee has monoamine oxidase inhibitors in it.

Most people can't answer the question "Is caffeine a xanthine or a phenethylamine" any better than chance. Good luck explaining there's a second drug that doesn't really get you high, but mildly inhibits the metabolism of a whole bunch of native 'drugs' in your brain as well as the caffeine.

No I mean that, good luck, it's fun to get as far as you can with that stuff. Just wanted to answer your second question.

what are the consequences of that inhibition??