Inclusion Criteria:  age of 18-70 years 12 points or more in the Finnish diabetes risk score or previous gestational diabetes or obese subjects technology skills (computers, smartphones, tablets with internet connection) absence of language barriers ability to provide written informed consent to the study  Exclusion Criteria:  Established diagnosis of diabetes Pregnancy and breastfeeding Renal or hepatic failure Severe cardiovascular, neurological, hematological, endocrinological, gastrointestinal, nephrological or pneumological affections that may interfere with the study Ongoing treatment with antidiabetics, diuretics, glucocorticoids, antypsychoticsoral contraceptives or other drugs known to affect glucose metabolism. History of pancreatitis Alcohol abuse or abuse of psychoactive substances Subjects with mental disorders, or predictably unfit to understand and issue valid written informed consent to the study Subjects with mental disorders, or not suitable for understanding and performing the tasks required by the study Bariatric surgery Current cancer or less than 6 months from the end of cancer treatment