More exercise and more food/carbs? Or moderate exercise and less food?

[John Paul]

At what point, even if it's healthy food that works with your body, is it too much food just for the sake of keeping up with exercise? At what point is it too much exercise? Is it better to fuel up more and progress in physical fitness? Or to exercise moderately so that the body has to digest less? I'm not a "scientist". Let me know if y'all know anything scientific about this stuff.