Abstract
Since the beginning of this century,obesity has became a chronic and metabolic disease,its incidence is rising.Obesity is not only a health-damaging disease,but also are risk factors of many diseases.It can lead to metabolic and cardiovascular diseases.It also has relations with respiratory system diseases,such as chronic obstructive pulmonary disease,bronchial asthma,pulmonary thromboembolism,aspiration pneumonia,and obstructive sleep apnea hypopnea syndrome.A study at Columbia University demonstrated that obesity is a threaten to the health of Americans,and it has been reached the extent of smoking on the respiratory system effects at the same time,the relationship between obesity and respiratory diseases can not be ignored. Key words: Obesity; Respiratory system diseases ; Body mass index
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