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Automated insulin delivery systems improve blood glucose control in patients with type 1 diabetes (T1D). However, optimizing their performance requires patient's proper compliance to meal insulin bolus administration. We explored real-life prevalence of delayed prandial boluses (DBs) in adults with T1D on advanced technologies, and their association with glycemic control and fear of hypoglycemia (FH). In the last two-week web-based reports of 152 adults with T1D on Hybrid Closed Loop Systems (HCLS) or Sensor Augmented Pump (SAP), DBs were identified when a steep increase in blood glucose occurred at CGM before the prandial bolus, and CGM metrics were evaluated. All participants completed an online questionnaire on FH. Mean DBs over two weeks were 10.2 ± 4.7 (M ± SD, range 1–23) and more frequent in women than men (11.0 ± 4.6 vs. 9.4 ± 4.7, p = 0.036). Participants with more DBs (>12) showed significantly lower Time-In-Range (62.4 ± 13.8 vs. 76.6 ± 9.0 %) than those with less DBs (<7.7), along with higher Time-Above-Range, GMI, and Coefficient-of-Variation (ANOVA, p < 0.001 for all). Participants with higher FH score showed more DBs (11.6 ± 5.0) than those in lower tertiles (9.57 ± 4.59 and 9.47 ± 4.45, ANOVA p = 0.045). In patients on advanced technologies, delayed boluses are extremely common, and associate with significantly worse glycemic control. Utmost attention is needed to bolus timing, mainly tackling fear of hypoglycemia. • Prandial insulin boluses are frequently delayed in patients with type 1 diabetes. • The delay impairs blood glucose control also in patients on advanced technologies. • Delayed insulin boluses are often related to fear of hypoglycemia. • Clinical care should focus on this issue, including appropriate attention to fear of hypoglycemia. [ABSTRACT FROM AUTHOR]

• Fatty liver is a raising concern in type 1 diabetes. • Type of insulin administration could play a pathophysiological role in fatty liver. • Insulin pump therapy is associated with lower fatty liver indices in women. Non-Alcoholic Fatty Liver Disease (NAFLD) is a raising concern in type 1 diabetes (T1D) patients. We evaluated whether multiple daily injections (MDI) or continuous subcutaneous insulin infusion (CSII) may differentially affect NAFLD. NAFLD was assessed by Fatty Liver Index (FLI) and Hepatic Steatosis Index (HSI) in 659 T1D patients treated by MDI (n = 414, 65% men) or CSII (n = 245, 50% men) without alcohol abuse or other liver diseases. Clinical and metabolic differences between MDI and CSII participants were also evaluated according to sex. Compared with the MDI cohort, CSII users had a significantly lower FLI (20.2 ± 21.2 vs. 24.8 ± 24.3; p = 0.003), HSI (36.2 ± 4.4 vs. 37.4 ± 4.4; p = 0.003), waist circumference (84.6 ± 11.8 vs. 86.9 ± 13.7 cm; p = 0.026), plasma triglyceride (76.0 ± 45.8 vs. 84.7 ± 58.3 mg/dl; p = 0.035), and daily insulin dose (0.53 ± 0.22 vs. 0.64 ± 0.25 IU/kg body weight; p < 0.001). In CSII users, lower FLI and HSI were observed in women (p = 0.009 and p = 0.033, respectively) but not in men (p = 0.676 and p = 0.131, respectively). Women on CSII also had lower daily insulin doses, plasma triglyceride, and visceral adiposity index than women on MDI. CSII is associated with lower NAFLD indices in women with T1D. This may relate to the lower peripheral insulin in the context of a permissive hormonal milieu. [ABSTRACT FROM AUTHOR]