Background: Studies in children reported an association between increased body mass index (BMI) and risk for developing type 1 diabetes (T1D) . We studied the association between adolescent BMI and incident T1D in young adulthood in a nationwide cohort of 1,462,362 adolescents which was recently used to assess the association between adolescent BMI and early-onset type 2 diabetes (Diabetes Care 2020 Jul;43 (7) :1487-1495) . Methods: All Israeli adolescents, ages 16-19, undergoing medical evaluation in preparation for mandatory military conscription between January 1996 and December 2016 were included for analysis unless they had a history of dysglycemia. Data were linked to information about adult onset of T1D in the Israeli National Diabetes Registry. Weight and height were measured at the study entry. Cox proportional models were applied, with BMI analyzed both as a categorical and as a continuous variable. Islet autoantibody data were available for a subpopulation of the cohort. Results: There were 777 incident cases of T1D during 15,810,751 person-years (mean age at diagnosis 25.2±3.9 years) . BMI was associated with incident T1D. In a multivariable model adjusted for age, sex and socio-demographic variables, the hazard ratios (HRs) for T1D were 1. (95% CI 0.87-1.27) for the 50th-74th BMI percentiles, 1.41 (1.11-1.78) for the 75th-84th BMI percentiles, 1.54 (1.23-1.94) for adolescents with overweight (85th-94th percentiles) , and 2. (1.58-2.66) for adolescents with obesity (BMI≥95th percentile) . One increment in BMI standard deviation was associated with 25% greater risk for incidence of T1D (HR=1.25, 95%CI 1.17-1.32) . Association persisted when the definition of T1D included the presence of islet autoantibodies; when the study population was restricted to those with unimpaired health. Conclusions: Excessively high BMI in apparently healthy adolescents is associated with increased risk for incident T1D in early adulthood. Disclosure I.Zucker: None. D.Tzur: None. C.Melzer cohen: None. O.Pinhas-hamiel: Advisory Panel; Novo Nordisk, Speaker's Bureau; Pfizer Inc. G.Chodick: None. I.Raz: None. A.Afek: None. H.C.Gerstein: Advisory Panel; Abbott, Eli Lilly and Company, Hanmi Pharm. Co., Ltd., Novo Nordisk, Pfizer Inc., Sanofi, Viatris Inc., Consultant; Kowa Company, Ltd., Other Relationship; DKSH, Eli Lilly and Company, Sanofi, Zuellig Pharma Holdings Pte. Ltd., Research Support; AstraZeneca, Eli Lilly and Company, Merck & Co., Inc., Novo Nordisk, Sanofi. A.Tirosh: Advisory Panel; Abbott Diagnostics, AstraZeneca, Boehringer Ingelheim International GmbH, Merck & Co., Inc., Novo Nordisk, Sanofi, Consultant; Bayer AG, DreaMed Diabetes, Ltd., Research Support; Medtronic, Speaker's Bureau; Eli Lilly and Company. G.Twig: None. Y.Zloof: None. A.Bardugo: None. A.M.Tsur: None. M.Lutski: None. Y.Cohen: None. T.Cukierman-yaffe: Research Support; European Association for the Study of Diabetes, Medtronic, Merck Sharp & Dohme Corp., Novo Nordisk, Speaker's Bureau; AstraZeneca, Eli Lilly and Company, Medtronic, Merck Sharp & Dohme Corp., Novo Nordisk, Sanofi. N.Minsky: None. E.Derazne: None. Funding This work was partially supported by an internal grant from the Israel Defense Forces Medical Corps.
Background: We compared glycemic outcomes and participant experience during MiniMed™ 780G Advanced Hybrid Closed Loop (AHCL) system use while announcing all meals vs. announcing meals at will. Methods: Participants with T1DM used the AHCL system at home during two 90 days phases in which they were given instructions first to announce all meals (AM) , and next, for meals containing up to 80 grams of carbohydrates, to announce meals at will (AMW) . Results: Fourteen subjects (males, mean age 44.3±11) with T1DM were enrolled, with a baseline A1C of 6.9±1%. Table 1 summarizes glycemic indices and AHCL data, demonstrating that patients chose to bolus only slightly less during AMW compared to AM (5.5 vs. 5.2 boluses) , without resultant deterioration in glycemic indices (A1c 6.4 vs. 6.5%, TIR 78.1 vs. 78.8%, p=ns) . Subjects surveyed regarding the option not to have to bolus for all meals experienced a significant reduction in reported effort to manage diabetes (p=0.045) and 86% endorsed worrying less about their diabetes. Most (93%) preferred the AMW phase of the study. Conclusion: The MinMed™ AHCL system is designed for optimal performance with meal announcement. Nonetheless, when meals containing < 80 grams of carbohydrates are consumed with announcement of meals at will, there is a slight reduction in the number of daily boluses with no decline in glycemic control, yet markedly less diabetes related distress and improved treatment satisfaction. Disclosure N. Minsky: None. R. Shalit: Speaker's Bureau; AstraZeneca, Boehringer Ingelheim International GmbH, Eli Lilly and Company, Medtronic, Novo Nordisk. O. Cohen: Employee; Medtronic. N. Kurtz: Employee; Medtronic. A. Roy: Employee; Medtronic. B. Grosman: Employee; Medtronic. A. Tirosh: Advisory Panel; Abbott Diagnostics, AstraZeneca, Boehringer Ingelheim International GmbH, Merck & Co., Inc., Novo Nordisk, Sanofi. Consultant; Bayer AG, DreaMed Diabetes, Ltd. Research Support; Medtronic. Speaker's Bureau; Eli Lilly and Company.
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