You can't out-cardio countless grams of crappy carbs. I know that vegetables, fruits, and quality protein are more expensive than wheat and corn products, but cows get fat by grazing on the grain. Don't be like the cow.
There are 168 hours in a week. If you train during five of them, that leaves 163 hours to possibly undo anything you achieved in the gym, so how about giving at least a passing nod to eating right? I suggest that learning the basics of cooking – as simple as learning to use a knife, a slow cooker, and a grill, along with some proactive shopping – will do as much for you as the next great "secret" training protocol.