Lung fibrosis is a condition characterized by accelerating scarring of lung tissue, which impairs breathing, reduces the oxygen level in the blood, and lowers the cellular energy turnover. Some types of lung fibrosis are very aggressive and there is currently no cure. Healthy omega-3 fatty acids from oily fish and fish oil supplements may delay the progression of the disease and postpone the immediate need for lung transplants, according to a study that is published in the journal CHEST.