Antioxidants are molecules that help protect the body from oxidative stress by neutralizing free radicals, which can damage cellular structures like DNA, proteins, and lipids. They play a crucial role in maintaining cellular health and preventing chronic diseases, including cardiovascular diseases, cancer, and neurodegenerative disorders. Antioxidants can be obtained from various dietary sources, including fruits, vegetables, nuts, and grains. The body also produces some antioxidants, such as glutathione. Consuming adequate antioxidants through a balanced diet is essential for mitigating the effects of aging and promoting overall well-being.