I say, not to worry. My girlfriend is Muslim, and although I don't go out of my way to have a lip-smackin' good time with food during Ramadan, my view is that religous observance is a choice, and that it is her choice, but not mine. Why should I feel guilty? I don't feel guilty for driving cars (or operating telephones, or light switches...) on the Sabbath, since I am not orthodox Jewish. Nor do I consider it a faux pas to take aspirin (or mefloquine!), since I am not a Christian Scientist. Finally, I seem to recall you having the occasional beer in front of your Muslim friends, which of course is interdite 365 sur 365.