My Colleague is studying some kind of social science type OU course and has just learnt all about ramadan and the ideas behind it etc. She then went into the petrol station and whilst chatting to the friendly (indian) guy behind the counter asked how he coped with working whilst fasting. He said it wasn't really a problem for him as it was 23:00 and he was Hindu.
I used to work regularly with a Muslim lad, it was great, he'd bring in loads of food from the night before's feast to share with everyone else. When I asked him wether it bothered him if people ate around him he said that it did and that it made him feel really hungary, but that was kind of the point, focusing on the suffering for his beliefs etc etc. Some quite interesting ideas towards faith for me as a non religious person.