If the juice was interfering with your finiancial situation and/or your relationship I would say the gf/wife. Ultimatims have to do with a control/power type thing and I hate being told what to do just for the sake of being told what to do. If someting were really detrimental to a relationship, lifestyle, or my own health but i wasnt realizing it because i liked it so much, that would be one thing, but being put in an ulitimatim becasue your gf/wife is most likely uneducated about it that's a whole othe thing. I would try to tell her as much as i know about it and i would tell her that if she really doesnt like it for reasons other than "its damaging to the body," cause it isn't, in proper doses, then i would tell her that i would quit for her (if I really loved her).
IS this just a hypothetical or have you been put in this situation? Good luck with everything bro
YUM