Antioxidants benefit the body by neutralizing free radicals, which can cause cellular damage and contribute to aging and various diseases. These compounds, found in fruits, vegetables, and whole grains, play a crucial role in maintaining overall health. They support the immune system, reduce inflammation, and can enhance exercise recovery. Consuming a diet rich in antioxidants can help protect the body from oxidative stress, ultimately promoting longevity and reducing the risk of chronic illnesses.