Establishment of Hong Kong Diabesity Register

Inclusion Criteria: 1. Type 2 diabetes; 2. Obesity reaching action level as defined as body mass index (BMI) 27.5 kg/m2 and/or waist circumference (WC) 80cm in women and 90cm in men; 3. Age between 18 and 50 years; 4. Able to conversate with smartphone technology and web-based program. 5. Able to read Chinese and communicate using Chinese. Exclusion Criteria: 1. Type 1 diabetes; 2. Active malignant disease including those with history of malignant disease less than 5 years of disease-free duration; 3. Life expectancy less than 12 months; 4. Any medical illness or condition as judged by the investigators as ineligible to participate the study.