Subway sells bread and lettuce. There's no junk there because there's no there there.
That's why it's so easy to lose weight eating their subs.
They make, bar none, the worst subs I've ever had in my 56 years on planet earth.
As far as Subway goes, the only recommendation I can make is to try the cold-cut combo...with double meat.
Everything else pretty much sucks, but I suspect that you dramatically decrease your chances of dropping dead on the spot by eating that as compared to, say, a double Quarter-Pounder with cheese.