Antioxidants protect the body from cellular damage caused by free radicals, unstable molecules that can lead to oxidative stress. Oxidative stress is linked to various chronic diseases, including cancer and heart disease. By neutralizing free radicals, antioxidants help to mitigate inflammation and promote cellular health. Sources of antioxidants include fruits, vegetables, nuts, and whole grains. Regular consumption of these foods can enhance the body's defense mechanisms and support overall well-being.