How and what you eat is an important part of your treatment plan for chronic obstructive pulmonary disorder (COPD). One reason -- certain foods can further irritate your airways and make your COPD symptoms worse. People with COPD may have trouble eating or keeping their weight on, so don't be surprised if your doctor talks about adding calories to your diet. Because every calorie counts, and because you need to be nourished to withstand a condition that can make you feel weak or tired, avoid the empty calories in sugary drinks or sweets and refined flours. Another no-no -- added salt, which can make you retain fluids and interfere with your lungs' ability to work well. And adding fiber to your diet -- from whole grains, fruits, and vegetables -- could be a lifesaver.