Lungs are the only organ present in both the respiratory and circulatory systems. They are made up of many different tissues. Lung tissue produces a protective fluid called surfactant, which helps your lungs stay open so you can breathe easily. Lungs need oxygen to work properly. They also need healthy cells that can fight off infection and protect against injury. Eating certain foods may help keep your lungs healthy and support your breathing! Here are 15 delicious foods that can improve your lung health.