Subway is junk that I don't eat, but it gets a lot of grief in a joking way that people take seriously. It isn't "bread" because it has more sugar than Irish law allowed, meaning it is more like US white bread than what anyone else says is bread. And I find it doubtful Subway makes their own tuna. It is entirely possible they are buying the cheapest stuff possible from China though, which would be their fault. All in all, there are less meme reasons to not eat there, like the fact that it is mostly empty carbs and fats that will not help your health at all.