most things are ok if they are cooked properly and consumed hot.
I've eated maccas (the ones without salad that Tara mentioned) and hot chips, potato cakes etc.
With my last pg I was hungry all the time and ate lots of subway, but I know the one I go to has high turnover as the queues are out the door and down the street.
This time I'm barely hungry so I'm not eating takeaway as often in the first place.

I'm too scared to have focaccias and that sort of thing though, uless I make them at myself home - they are never cooked hot enough.