Subway is very expensive. When I was a reporter I worked 60 hours a week and was on call 24-7 with a police scanner running non-stop. I did not have time to cook anything at home, but tried to get salads whenever possible. However, here (US) it is not easy. Everything is supersized. They even made a movie called "Supersize Me" and the guy really got sick from all the  fast food he ate while making the documentary. I was In England and France last summer, and everyone walks. Even to get a London tube train you must walk walk walk in the tunnel to catch the right train. That's why they are so thin. All the walking.