Oxidative stress occurs when there is an imbalance between free radicals and antioxidants in the body. Free radicals are unstable molecules that can damage cells, proteins, and DNA. Antioxidants, found in various foods like fruits and vegetables, help neutralize these free radicals. When the production of free radicals exceeds the body's ability to counteract their harmful effects, oxidative stress can result. This condition is linked to various health issues, including heart disease, diabetes, and cancer. Factors contributing to oxidative stress include environmental pollutants, smoking, and excessive alcohol consumption. Managing oxidative stress through a balanced diet and healthy lifestyle can help reduce the risk of these diseases.