On the other hand, if you're eating at McDonald's, I suspect the presence of trans fats in the oil isn't something you're super worried about - it's not like it's junk food loaded up with things you can barely pronounce, specifically designed to make up 75% of your recommended allowance of calories while containing as little meat/veg as possible.

McDonald's, as long as you approach the menu reasonably, is honestly probably one of the better fast food options - not something you should be eating every day, but once every couple of weeks probably isn't going to kill you any faster than anything else you do.