Research published in Epidemiologic Reviews (2001;23(2):268–287) suggests that antioxidant vitamins—particularly vitamin E and vitamin C—may help protect against the development of lung disease. Oxidative stress from free radicals can damage cell membranes and tissues. Free radicals are unstable molecules with an extra electron, often compared to chemical “bullets.” Antioxidant nutrients act like protective vests, neutralizing these reactive molecules before they can injure cells.

The authors reviewed numerous studies and found evidence that:

  • Vitamin C supplementation improved lung function in patients with COPD (chronic obstructive pulmonary disease, including emphysema and bronchitis).

  • Higher consumption of fruits and vegetables may help improve asthma symptoms in children.

Fruits and vegetables contain a wide range of antioxidant compounds, making it difficult to identify a single nutrient responsible for the benefit. The overall pattern suggests that antioxidant-rich diets may support healthier lung function, especially in environments where oxidative stress is high.

While antioxidants appear to offer short-term improvement in lung function, the researchers emphasized that there is not yet enough long-term evidence to conclude that supplementation slows the progression of chronic lung diseases. However, they recommend antioxidant support for individuals with high oxidative stress, including smokers and people exposed to significant air pollution.

Educational only — not medical advice.