(A) Protein is vital for the maintenance of muscle to aid in breathing. A high-calorie diet using higher fat than carbohydrate content is given because clients are unable to breathe off the excess CO2that is an end product of carbohydrate metabolism. (B) Inadequate nutritional status, in particular, deficiencies in vitamins A and C, decreases resistance to infection. (C) Milk does not make mucus thicker. It may coat the back of the throat and make it feel thicker. Rinsing the mouth with water after drinking milk will prevent this problem. (D) Small, frequent meals minimize a fullness sensation and reduce pressure on the diaphragm. The work of breathing and SOB are also reduced.