DiaMester Pilot RCT: E-health Lifestyle Program for Type 2 Diabetes

Inclusion Criteria: * Written informed consent * Men and women aged ≥ 18 years * Type 2 diabetes of duration 0-6 years (diagnosis based on 2 recorded diagnostic-level tests, HbA1c and/or blood glucose) * HbA1c ≥ 48 mmol/mol at the last routine clinical check, within last 12 months if on diet alone * HbA1c ≥ 43 mmol/mol if on treatment with oral hypoglycaemic agents or GLP-1 RA treatment * Body Mass Index (BMI) \>27 kg/m2 * Stable body weight during the last 6 months with or without the use of weight-reducing drugs * Self-reported desire to lose weight * Owns a smartphone Exclusion criteria: * Current insulin use * \> 5% weight change or started treatment with weight reducing drugs\* within the last 6 months. \*orlistat (Xenical), bupropion-naltrekson (Mysimba), fenteramin-topiramat (Qsimba), semaglutid (Wegovy, Ozempic), tirzepatid (Mounjaro), liraglutid (Saxenda, Victoza), dulaglutid (Truicity). * Recent routine HbA1c ≥108 mmol/mol * Recent eGFR \<30 ml/min/1.73 m\^2 * Known cancer * Myocardial infarction within previous 6 months * Severe heart failure defined as equivalent to the New York Heart Association grade 3 (NYHA) * Pregnancy/considering pregnancy or exclusively breastfeeding * Substance abuse (drugs, alcohol) * Diagnosed eating disorders or suspected ED based on screening questionnaire * Learning difficulties or unable to understand, speak and read Norwegian or English * Patients who have required hospitalization for depression or are on antipsychotic drugs * People currently participating in another clinical research trial