Aims: To describe weight-change pathways in patients with type 2 diabetes (T2D) and associated healthcare costs using repeated BMI measurements and healthcare utilization data. Methods: Patients with newly-diagnosed T2D with body mass index (BMI, kg/m(2)) at diagnosis and subsequent measures at year 1-3 were identified. Based on three-year BMI change, patients were assigned to one of 27 BMI change pathways defined by annual BMI change: BMI NE arrow (amp;gt;= 1 BMI unit increase), BMI -amp;gt; (amp;lt;1 BMI unit change), and BMI SE arrow (amp;gt;= 1 BMI unit decrease). Mean annual and three-year cumulative healthcare costs were estimated for each pathway by combining Swedish unit costs with resource use from primary care and national patient registers. Results: Cohort consisted of 15,819 patients; 44% women, mean age of 61 years, HbA1c of 6.7% (50 mmol/mol), BMI of 30.6 kg/m(2). Most common BMI pathways (mean costs): BMI -amp;gt;-amp;gt;-amp;gt; ((sic)5,311), BMI SE arrow -amp;gt;-amp;gt;((sic)5,461), and BMI -amp;gt;-amp;gt;SE arrow((sic)6,281). General trends: BMI)-amp;gt;-amp;gt;-amp;gt; linked to lowest, BMI NE arrow -amp;gt;NE arrow linked to highest costs. Conclusion: In patients with newly -diagnosed T2D, weight stability was the most common BMI change pattern over 3 years and associated with lowest healthcare costs. Relationship between weight change and healthcare costs appears complex warranting further investigation. (C) 2017 The Authors. Published by Elsevier Ltd on behalf of Primary Care Diabetes Europe.