Low respiratory function (asthma): obesity leads to the thickening of chest wall and abdominal fat, which reduces vital capacity and vital capacity and affects the normal ventilation function of the lungs. Moreover, due to insufficient ventilation, it may cause an increase in red blood cells and cause vascular embolism. In severe cases, pulmonary hypertension, cardiac enlargement and infarct heart failure may occur. Because of the accumulation of fat, it may also affect the activity of cilia in the trachea, making it unable to function normally.