After 3 years, researchers discovered that copd patients that ate foods rich in antioxidants (fruits and vegetables) showed an increase in lung function, compared to patients that were on a standard diet. researchers suggest that a diet rich in antioxidants may bring favorable outcomes to improved lung function in patients suffering from copd. Flavonoids, vitamin e, and vitamin c all help the lungs function at their best. apples are rich in all of these and those who eat several a week have healthier lung function foods healthy lungs. apples are rich in antioxidants which can help keep your lungs healthy. 9. grapefruit. naringin, a flavonoid in grapefruit, inhibits the activation of a cancer-causing enzyme. The Most Effective Foods To Cleanse Your Lungs Research There are several factors that can affect lung health, including physical activity levels, genetics and environmental conditions. diet also plays a key role in respiratory health, and incorporating a few of the best foods for...