I think what worked for Jarad the most was
not what he ate - but rather -
what he did not eat - while exercising the self-discipline to eat only what he got from Subway. Obviously, eating better more-nutritious food was the foundation. However, what he "gave up" in order to stick to the Subway diet probably had the greatest direct amount of change over time. In general, one can eat all of nutritious food they want and loose "the extra" - it is the "other stuff" we eat that gives us "the extra"...
Ultimately, it is about self-discipline and eating right. And, there is no escape from this if you want to be [truly] healthy.