INS and type 2 diabetes mellitus: <h4>Aims</h4>To characterize changes in continuous glucose monitoring (CGM)-derived time in tight range (TIR) measures in individuals with prediabetes or non-insulin-treated type 2 diabetes undergoing dietary weight loss intervention and to quantify the association between weight loss and TIR improvement.<h4>Methods</h4>Data from the Personal Diet Study, a 6-month behavioural weight loss intervention in adults with prediabetes or non-insulin-treated type 2 diabetes [HbA<sub>1c</sub> ≤ 8.0% (64 mmol/mol), managed with diet alone or with metformin], was analysed.