Cerebral Blood Flow and Glucose Metabolism in Appetite-Related Brain Regions in Type1Diabetic PatientsAfter TreatmentWith Insulin Detemir andNPH Insulin

OBJECTIVEdTo test the hypothesis that insulin detemir, which is associated with less weight gain than other basal insulin formulations, exerts its weight-modulating effects by acting on brain regions involved in appetite regulation, as represented by altered cerebral blood flow (CBF) or cerebral glucose metabolism (CMRglu). RESEARCH DESIGN AND METHODSdTwenty-eight male type 1 diabetic patients (age 36.9 6 9.7 years, BMI 24.9 6 2.7 kg/m2, A1C 7.5 6 0.6%) successfully completed a randomized crossover study, consisting of two periods of 12-week treatment with either insulin detemir or NPH insulin, both in combination with prandial insulin aspart. After each treatment period, patients underwent positron emission tomography scans to measure regional CBF and CMRglu. RESULTSdAfter 12 weeks, A1C, daily insulin doses, fasting insulin, and blood glucose levels were similar between treatments. Insulin detemir resulted in body weight loss, whereas NPH insulin induced weight gain ( between-treatment difference 1.3 kg; P = 0.02). After treatment with insulin detemir relative to NPH insulin, CBFwas higher in brain regions involved in appetite regulation, whereas no significant difference in CMRglu was observed