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Anthocyans belong to the class of so-called flavonoids: substances in plants that have antioxidant and anti-inflammatory properties. If you eat a lot of fruit and plants with anthocyans this will probably support your lungs, as the study by Mehta et al. found. For example, if your airways become obstructed because of diseases like asthma, COPD or emphysema, or if your lungs become stiff because of fibrosis, you won’t be able to exhale as much air as a healthy person, which can be measured. There’s also a general decline of lung function during the aging process. But if you eat 2 or more servings of blueberries a week, or other food with anthocyans, you might be able to take a positive influence on your lung function.