Diabetes & Metabolism Journal

Letter

Impact of Medication Adherence on Cardiovascular Outcomes in People with Type 2 Diabetes Mellitus and Disabilities: Onyou Kim, Myeongcheol Lee, Wonchang Hahn, Chang Hoon Kim, Seohyun Kim, Danbee Kang, Ki Hong Choi; Diabetes Metab J. 2026;50(2):418-421. Published online March 1, 2026; DOI: https://doi.org/10.4093/dmj.2025.1261

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Original Articles

Cardiovascular Risk/Epidemiology
High Waist-to-Height Ratio Increases the Risk of Cardiovascular Outcomes in Adults with Type 1 Diabetes Mellitus: A Nationwide Cohort Study: Kyeong-Jin Kim, Seohyun Kim, Rosa Oh, So Hyun Cho, Myunghwa Jang, You-Bin Lee, Gyuri Kim, Sang-Man Jin, Kyu Yeon Hur, Ji Yoon Kim, Jae Hyeon Kim; Received March 4, 2025 Accepted June 21, 2025 Published online September 4, 2025; DOI: https://doi.org/10.4093/dmj.2025.0179 [Epub ahead of print]

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Abstract PDF Supplementary Material PubReader ePub: Background
Central obesity contributes to an increased risk of cardiovascular disease (CVD) and mortality. The waist-to-height ratio (WHtR) is a practical marker of central obesity across sexes, ages, and ethnicities. However, its association with comprehensive cardiovascular (CV) outcomes in patients with type 1 diabetes mellitus (T1DM) remains unclear.
Methods
From a nationwide cohort database (2006–2020), 16,928 Korean adults with T1DM were included. Participants were categorized by their WHtR values using three criteria: a three-group classification (<0.5, 0.5 to <0.6, and ≥0.6) and two binary classifications (≥0.5 vs. <0.5; ≥0.6 vs. <0.6). The primary outcomes were composite CV events, including heart failure (HF), myocardial infarction (MI), ischemic stroke, and CVD-related deaths, with each component analyzed as a secondary outcome.
Results
During a median follow-up of 6.7 years (interquartile range, 5.2 to 8.8), 4,293 composite CV events occurred. Compared to the WHtR <0.5 group, the adjusted hazard ratios (aHRs) and 95% confidence intervals (CIs) for the composite CV outcome were 1.14 (1.05 to 1.24) in the WHtR 0.5 to <0.6 group and 1.62 (1.38 to 1.90) in the WHtR ≥0.6 group (P for trend <0.001). Increasing trends in aHRs were noted with rising WHtR values for each component of the composite outcome. Compared to the WHtR <0.6 group, the aHRs for the WHtR ≥0.6 group were as follows: HF, 1.49 (95% CI, 1.28 to 1.73); MI, 1.31 (95% CI, 1.02 to 1.68); ischemic stroke, 1.24 (95% CI, 1.02 to 1.51); and CVD-related death, 2.09 (95% CI, 1.49 to 2.92).
Conclusion
High WHtR is associated with an increased risk of CV events in adults with T1DM.

Technology/Device
Current Status of Continuous Glucose Monitoring Use in South Korean Type 1 Diabetes Mellitus Population–Pronounced Age-Related Disparities: Nationwide Cohort Study: Ji Yoon Kim, Seohyun Kim, Jae Hyeon Kim; Diabetes Metab J. 2025;49(5):1040-1050. Published online April 28, 2025; DOI: https://doi.org/10.4093/dmj.2024.0804

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Background
This study aims to identify the status of continuous glucose monitoring (CGM) use among individuals with type 1 diabetes mellitus (T1DM) in South Korea and to investigate whether age-related disparities exist.
Methods
Individuals with T1DM receiving intensive insulin therapy were identified from the Korean National Health Insurance Cohort (2019–2022). Characteristics of CGM users and non-users were compared, and the prescription rates of CGM and sensor- augmented pump (SAP) or automated insulin delivery (AID) systems according to age groups (<19, 19–39, 40–59, and ≥60 years) were analyzed using chi-square tests. Glycosylated hemoglobin (HbA1c) levels and coefficients of variation (CV) among CGM users were also examined.
Results
Among the 56,908 individuals with T1DM, 10,822 (19.0%) used CGM at least once, and 6,073 (10.7%) used CGM continuously. Only 241 (0.4%) individuals utilized either SAP or AID systems. CGM users were younger than non-users. The continuous prescription rate of CGM was highest among individuals aged <19 years (37.0%), followed by those aged 19–39 years (15.8%), 40–59 years (10.7%), and ≥60 years (3.9%) (P<0.001 for between-group differences). Among CGM users, HbA1c levels decreased from 8.7%±2.4% at baseline to 7.2%±1.2% at 24 months, and CV decreased from 36.6%±11.9% at 3 months to 34.1%±12.7% at 24 months.
Conclusion
Despite national reimbursement for CGM devices, the prescription rates of CGM remain low, particularly among older adults. Given the improvements in HbA1c and CV following CGM initiation, more efforts are needed to increase CGM utilization and reduce age-related disparities.

Citations

Citations to this article as recorded by

Association of perceived diabetes stigma with time below range <3.0 mmol/L and anxiety in adults with type 1 diabetes using continuous glucose monitoring
Seohyun Kim, Soojin Park, Sang‐Man Jin, Jae Hyeon Kim, Gyuri Kim
Diabetic Medicine.2026;[Epub] CrossRef
Suboptimal adoption of diabetes technology despite coverage and the impact on glycemic outcomes in children and adolescents with type 1 diabetes in Hong Kong
Sarah Wing-yiu Poon, Kwong-tat Chan, Betty Wai-man But, Shirley Man-yee Wong, Wing-in Yam, Pik-to Cheung, Wing-shan See, Suk-yan Chan, Ho-chung Yau, Eunice Wai Yu Wong, Lap Ming Wong, Antony Chun-cheung Fu, Elaine Yin-wah Kwan, Janez Heung-ching Tsui, Sin
Journal of Pediatric Endocrinology and Metabolism.2026;[Epub] CrossRef
Sequential use of continuous glucose monitoring, with or without exercise trackers, significantly improves glycemic control in patients with type 2 diabetes
Anushka Lahiri, Suan Tee Lim, Htike Kyu, Yock Young Dan, Chin Meng Khoo
Diabetology & Metabolic Syndrome.2025;[Epub] CrossRef
Efficacy and Safety of Stage 5 Connected Insulin Pens in Type 1 or Type 2 Diabetes: Randomized Controlled Trial Protocol
Ji Yoon Kim, Nam Hoon Kim, Soo Heon Kwak, Chang Hee Jung, Eun Seok Kang, Jun Sung Moon, Sun Joon Moon, So Yoon Kwon, Jee Hee Yoo, Younghoon Kim, Tae-min Lee, Chung-il Yang, Jae Hyeon Kim, Sang-Man Jin
Endocrinology and Metabolism.2025;[Epub] CrossRef

Technology/Device
Comparison of Real-Time and Intermittently-Scanned Continuous Glucose Monitoring for Glycemic Control in Type 1 Diabetes Mellitus: Nationwide Cohort Study: Ji Yoon Kim, Seohyun Kim, Jae Hyeon Kim; Diabetes Metab J. 2025;49(3):436-447. Published online February 27, 2025; DOI: https://doi.org/10.4093/dmj.2024.0160

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Background
This study compares the association between real-time continuous glucose monitoring (rtCGM) and intermittently- scanned CGM (isCGM) and glycemic control in individuals with type 1 diabetes mellitus (T1DM) in a real-world setting.
Methods
Using data from the Korean National Health Insurance Service Cohort, individuals with T1DM managed by intensive insulin therapy were followed at 3-month intervals for 2 years after the initiation of CGM. The glycosylated hemoglobin (HbA1c) levels and coefficients of variation (CVs) of rtCGM and isCGM users were compared using independent two-sample t-test and a linear mixed model.
Results
The analyses considered 7,786 individuals (5,875 adults aged ≥19 years and 1,911 children and adolescents aged <19 years). Overall, a significant reduction in HbA1c level was observed after 3 months of CGM, and the effect was sustained for 2 years. The mean HbA1c level at baseline was higher in rtCGM users than in isCGM users (8.9%±2.7% vs. 8.6%±2.2%, P<0.001). However, from 3 to 24 months, rtCGM users had lower HbA1c levels than isCGM users at every time point (7.1%±1.2% vs. 7.5%±1.3% at 24 months, P<0.001 for all time points). In both adults and children, the greater reduction in HbA1c with rtCGM remained significant after adjusting for the baseline characteristics of the users. The CV also showed greater decrease with rtCGM than with isCGM.
Conclusion
In this large nationwide cohort study, the use of rtCGM was associated with a greater improvement in glycemic control, including HbA1c reduction, than the use of isCGM in both adults and children with T1DM.

Citations

Citations to this article as recorded by

Beneficial Analysis for Glucose Variability by Continuous Glucose Monitoring (CGM)
Sanae Mima, Hiroshi Bando, Akemi Tamura, Yukari Okino, Takumi Yamada, Yoshiyuki Abe
Asploro Journal of Biomedical and Clinical Case Reports.2025; 8(2): 193. CrossRef
Islet Tissue Macrophages in Immunity Homeostasis and Type 1 Diabetes
Yan Wang, Zhaoran Wang, Wenya Diao, Tong Shi, Jiahe Xu, Tiantian Deng, Chaoying Wen, Jienan Gu, Tingting Deng, Sixuan Wang, Cheng Xiao
Clinical Reviews in Allergy & Immunology.2025;[Epub] CrossRef
Continuous glucose monitoring in Korean pediatric patients with type 1 diabetes: current landscape and clinical implications
Hwa Young Kim, Jaehyun Kim
Clinical and Experimental Pediatrics.2025; 68(11): 842. CrossRef
Dispositivi indossabili per la gestione del diabete
Filippo CARLUCCI, Antonella TABUCCHI, Marcello FIORINI, Lucrezia GALASSO, Alessandro TERRENI
Biochimica Clinica.2025;[Epub] CrossRef
Efficacy and Safety of Stage 5 Connected Insulin Pens in Type 1 or Type 2 Diabetes: Randomized Controlled Trial Protocol
Ji Yoon Kim, Nam Hoon Kim, Soo Heon Kwak, Chang Hee Jung, Eun Seok Kang, Jun Sung Moon, Sun Joon Moon, So Yoon Kwon, Jee Hee Yoo, Younghoon Kim, Tae-min Lee, Chung-il Yang, Jae Hyeon Kim, Sang-Man Jin
Endocrinology and Metabolism.2025;[Epub] CrossRef

Metabolic Risk/Epidemiology
Metabolic Dysfunction-Associated Steatotic Liver Disease and All-Cause and Cause-Specific Mortality: Rosa Oh, Seohyun Kim, So Hyun Cho, Jiyoon Kim, You-Bin Lee, Sang-Man Jin, Kyu Yeon Hur, Gyuri Kim, Jae Hyeon Kim; Diabetes Metab J. 2025;49(1):80-91. Published online August 28, 2024; DOI: https://doi.org/10.4093/dmj.2024.0042

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Background
Given the association between nonalcoholic fatty liver disease and metabolic risks, a new term, metabolic dysfunction- associated steatotic liver disease (MASLD) has been proposed. We aimed to explore the association between MASLD and all-cause, cause-specific mortalities.
Methods
We included individuals with steatotic liver disease (SLD) from the Korean National Health Insurance Service. Moreover, SLD was defined as a fatty liver index ≥30. Furthermore, MASLD, metabolic alcohol-associated liver disease (MetALD), and alcoholic liver disease (ALD) with metabolic dysfunction (MD) were categorized based on alcohol consumption and MD. We also analyzed all-cause, liver-, cancer-, hepatocellular carcinoma (HCC)- and cardiovascular (CV)-related mortalities.
Results
This retrospective nationwide cohort study included 1,298,993 individuals aged 40 to 79 years for a mean follow-up duration of 9.04 years. The prevalence of MASLD, MetALD, and ALD with MD was 33.11%, 3.93%, and 1.00%, respectively. Relative to the “no SLD” group, multivariable analysis identified that MASLD (adjusted hazard ratio [aHR], 1.28; 95% confidence interval [CI], 1.26 to 1.31), MetALD (aHR, 1.38; 95% CI, 1.32 to 1.44), and ALD with MD group (aHR, 1.80; 95% CI, 1.68 to 1.93) have a significantly higher risk of all-cause mortality. Furthermore, MASLD, MetALD, ALD with MD groups showed higher liver-, cancer-, and HCC-related mortality than “no SLD” group. While all-cause specific mortalities increase from MASLD to MetALD to ALD with MD, the MetALD group shows a lower risk of CV-related mortality compared to MASLD. However, ALD with MD group still have a higher risk of CV-related mortality compared to MASLD.
Conclusion
SLD is associated with an increased risk of all-cause, liver-, cancer-, HCC-, and CV-related mortalities.

Citations

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Treatment approaches for alcohol use disorder with metabolic dysfunction
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Pharmacology & Therapeutics.2026; 277: 108957. CrossRef
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KASL clinical practice guidelines for the management of metabolic dysfunction-associated steatotic liver disease 2025
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Clinical and Molecular Hepatology.2025; 31(Suppl): S1. CrossRef
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Jordi Gratacós-Ginès, Edilmar Alvarado-Tapias, David Martí-Aguado, Hugo López-Pelayo, Ramón Bataller, Elisa Pose
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Synergistic benefit of thiazolidinedione and sodium-glucose cotransporter 2 inhibitor for metabolic dysfunction-associated steatotic liver disease in type 2 diabetes: a 24-week, open-label, randomized controlled trial
Minyoung Lee, Sukchul Hong, Yongin Cho, Hyungjin Rhee, Min Heui Yu, Jaehyun Bae, Yong-ho Lee, Byung-Wan Lee, Eun Seok Kang, Bong-Soo Cha
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Eva Juárez-Hernández, Montserrat Berrospe-Alfaro, Misael Uribe, Iván López-Mendez
Journal of Clinical and Experimental Hepatology.2025; 15(6): 103114. CrossRef
MetALD: new insights and unraveling therapeutic potential
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So Hyun Cho, Gyuri Kim, Kyu-na Lee, Rosa Oh, Ji Yoon Kim, Myunghwa Jang, You-Bin Lee, Sang-Man Jin, Kyu Yeon Hur, Kyungdo Han, Jae Hyeon Kim
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