For years, doctors viewed chronic obstructive pulmonary disease, often known as COPD or emphysema, as a condition that could only get worse over time. People living with this condition suffer from damaged air sacs and constant swelling in their breathing tubes, making simple everyday activities feel exhausting. However, a landmark three-year clinical trial led by Dr Panagiotis Keranis and published in the European Respiratory Journal proved that changing what we eat can actually help slow down this damage and support lung health.
In this study, researchers split 120 people with COPD into two equal groups. One group carried on eating their usual daily diet. The second group was asked to make one small change: eat at least one extra portion of fresh fruit or vegetables every single day. Over the three years, the group that did not change their diet experienced a gradual decline in their breathing strength and overall lung capacity, which is the typical path of the disease. In contrast, the patients who ate extra fresh produce managed to hold their ground, showing slight improvements in their lung function over time.
Medical experts believe that the natural antioxidants found in fresh fruit and vegetables play a key role by protecting delicate lung tissues from harmful chemical stress. Modern research shows that these plant-based foods are packed with dietary fibre. Friendly bacteria in our gut digest this fibre and produce helpful compounds called short-chain fatty acids, which travel through the body to soothe inflammation inside the lungs.
Eating more fresh plant foods also naturally pushes out heavier, processed items and red meats that tend to trigger internal swelling and damage cells.
Rather than encouraging people to eat better, some commercial interests took these findings in an odd direction. Tobacco companies looked into adding acai berry extracts directly into cigarettes to see if it would reduce lung damage in laboratory animals, while food manufacturers experimented with adding fruit extracts into burger meat or grape seed powder into sausages to make them healthier.
Unsurprisingly, adding healthy ingredients to processed products or harmful items misses the point entirely. Leading health organisations now agree that simply eating a balanced diet rich in whole fruits, vegetables, beans, and healthy oils offers the best protection for your breathing.
Sources and References:
Keranis, P. et al. (2010). “Impact of dietary shift to higher-antioxidant foods in COPD: a randomised trial.” European Respiratory Journal, 36(4), 774-780.
Valisoltani, A. et al. (2023). “Gut-Lung Axis in COPD: Investigating the Impact of Dietary Fiber Intake on Systemic Inflammation and Lung Function Decline.” Annals of Medicine & Surgery.
Cleveland Clinic (2024). “COPD Diet: Nutrition and Foods To Avoid.” Health Essentials.
PLOS One / Indian Council of Medical Research Studies (2025). “The prevalence and correlates of obstructive lung disease among adults aged 45 and above in India.”