>The food stuff they have there isn't halal slaughtered, but since it was prepared by a non-Muslim its permissible to eat.
I am sorry I don't think I understood what you meant.
There are obviously different types of 'physically bad' if you eat fast food like once a week and not in great quantity it won't harm you so it should be Halal in that sense.Sure eating a lot of it would harm your body but it doesn't make small doses of it Haram.