As someone who likes a good subway every once in a while, there are definitely a few things you should refrain from ordering.

Chicken comes to mind.

Also, the recipe for bread they use in the US is different from many other countries because in those other countries the American version can’t legally be called bread. (I think it had to do with the sugar content)

Subway also has a history of being pretty hostile towards anyone who speaks against their “healthy fast food” narrative. I mentioned chicken above, well they sued CBC for reporting on a study that found Subway chicken was only about 50% chicken DNA, with the rest being soy protein.

They were also sued a couple years back by someone claiming their tuna wasn’t really tuna, but that case was dismissed by the plaintiff, citing pregnancy complications making it difficult to continue.