but a more useful way to look at the connection between food and exercise is not that they are equal partners. A more practical view is that food is the fuel that makes exercise possible. When you eat simple carbs for lunch, you find yourself wanting a nap more than you want to spend an hour on the treadmill. If you stuff yourself for dinner, you might cancel your plans to go for a run. If you manage your diet right, you’ll want to exercise more, and that will translate into doing so.