Processed foods contribute to free radicals in the body. A free radical is basically an unstable rogue oxygen molecule that tries to stabilize itself by glomming onto another stable, healthy molecule. The trouble is, the free radical winds up destroying the once-healthy molecule in the process. Free radicals are a major source of aging. Your body naturally has free radicals and naturally can defend itself—but if you tip the balance in favor of these little monsters, your face and body will start showing the wear and tear. Processed foods include meats and cheeses and anything with a long list of chemical ingredients.