2.1 The day before the participants go to hospital for the second interview. 2.1.1 Any drink, food and strenuous activity should be avoided at least 8 hours before the second interview; 2.1.2 The standard form of daily activity should be brought. 2.2 During this interview: 2.2.1 Physical examination：blood pressure, heart rate, height, bodyweight, waist and hip circumference; 2.2.2 The details of participants taking medicine, following the diet and exercise regime should be asked; 2.2.3 Laboratory examination: level of adiponectin, leptin, resistin, C-reactive protin, insulin, fasting blood glucose, haemoglobin A1c, triglycerides, total cholesterol, LDL cholesterol, HDL cholesterol; 2.2.4 20ml blood sample is collected to measure the level of adiponectin, resistin, leptin and the expression of obese related genes; 2.2.5 Abdominal MRI should be made; 2.2.6 Any discomfort of the participants should be recorded and medical treatment should be provided when it is necessary; 2.2.7 The previous standard form of daily activity are hand over to the CRA and blank forms are provided; 2.2.8 The untaken drugs should be retrieved, packed and a record should be maed; 2.2.9 Drugs of the next month should be distributed and a relevant record should be made.