You're fat because of what you're eating, and how little your moving, sorry dude but that's 100% true. Some of that might be out of your control, but it's reality...
The other option is run faster but intermittently.
It came as a surprise to me that many people are self-conscious about stopping to walk during running -- that's how I've always done it! I never thought anything of it because I have always been in shape as 100m / 200m sprinter... I'd encourage others to try this, because although I love running, I also could never really get into jogging.
American food is shit. Most people have no clue what healthy food is, even if they intend to eat a healthy diet.