Chronic diseases, including cardiovascular disorders, diabetes, cancer and neurodegenerative conditions, are among the leading causes of morbidity and mortality globally. These diseases impose a significant burden on healthcare systems and public health. A key factor in their development is oxidative stress which occurs when there is an imbalance between the production of free radicals and the body’s antioxidant defense systems. Free radicals are highly reactive molecules that can damage cells, tissues and DNA, contributing to the onset and progression of various chronic diseases. Antioxidants which are naturally occurring compounds in foods, play a critical role in mitigating oxidative stress by neutralizing free radicals and protecting cellular structures from oxidative damage. Dietary antioxidants, including vitamins C and E, carotenoids, polyphenols and flavonoids, have garnered attention for their potential in reducing oxidative damage and promoting health. These antioxidants are abundant in a wide variety of foods, including fruits, vegetables, nuts, seeds and whole grains. Research has shown that regular consumption of antioxidant-rich foods can support the body’s defense systems, reduce inflammation and lower the risk of developing chronic conditions such as heart disease, diabetes and certain cancers. This review examines the current evidence on the health benefits of dietary antioxidants, including their mechanisms of action, food sources and the role they play in preventing oxidative stress. Furthermore, it explores the potential implications for public health strategies, such as the incorporation of antioxidant-rich foods into dietary guidelines and health policies aimed at reducing the global burden of chronic diseases.