Oxidative stress is a natural by-product of cellular metabolism — in simple terms, it occurs when the body produces energy from food and oxygen. During this process, unstable molecules called free radicals  are formed. Oxidative stress can be worsened by exposure to pollutants such as cigarette smoke, alcohol, pesticides, and by a poor diet. The body is equipped with protective mechanisms known as antioxidants , which help neutralise free radicals. Problems arise when there i