Patients will be evaluated before the surgery (time zero), 6 months and one year after their surgery. A control group of patients on a waiting list for bariatric surgery will be evaluated at time zero and after 6 months and one year.
At each visit,patients will:
* fill a standardized respiratory questionnaire and a questionnaire on sleep apnea; questionnaires on asthma control will be completed by patients with asthma.
* have a spirometry, pulmonary volumes measures by body plethysmography and methacholine inhalation test with evaluation of symptoms perception.
* an induced sputum will be performed.
* A blood sample will be drawn to evaluate inflammation and measure C-reactive protein concentration in plasma.
* An allergy skin prick test will be done at time zero.
