Disease prevention The main focus is on avoiding high-risk factors for the onset of disease. Avoidance or prevention of dust, smoke and harmful gas inhalation, especially smoking cessation. Smoking is the most important risk factor for COPD, and smoking cessation is the measure that has so far proven to be effective in slowing down the progressive decline of lung function. Pulmonary function monitoring should be performed regularly for people at high risk of COPD in order to detect COPD as early as possible and intervene in a timely manner. Dietary considerations A diet high in protein and low in carbohydrates is recommended. Because a high-carbohydrate diet can increase respiratory work, a low-carbohydrate diet is recommended. And one of the common comorbidities in patients is skeletal muscle damage and weakness, which can be helped by a high-protein diet.