COPD is a lung disease that makes breathing difficult by damaging the airways and trapping air in the lungs. It involves conditions like emphysema and chronic bronchitis and is usually caused by smoking. Symptoms include shortness of breath, coughing, and weight loss. Treatment involves bronchodilators, steroids, antibiotics and nutritional intervention. For those with COPD and low weight or nutritional risk, dietary supplements are recommended to increase calorie intake. Monitoring quality of life factors like ability to obtain and prepare food is also important for managing COPD.