Diabetes & Metabolism Journal

Original Article

Guideline/Statement/Fact Sheet
Diabetes Fact Sheet 2025: Special Edition on Diabetes with Obesity and in Pregnancy: Se Eun Park, Se Hee Min, Jin Hwa Kim, Seung-Hwan Lee, Han Na Jung, Joon Ho Moon, Kyungdo Han, Seung-Hyun Ko, Bong Soo Cha, Sung Hee Choi; Diabetes Metab J. 2026;50(2):255-266. Published online March 1, 2026; DOI: https://doi.org/10.4093/dmj.2025.1162

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Background
We evaluated epidemiologic trends and clinical characteristics in Koreans with diabetes and obesity and in those with diabetes in pregnancy.
Methods
We analyzed Korea National Health and Nutrition Examination Survey data (2012–2023) to assess obesity trends in people with diabetes and used the Korean National Health Insurance Service database (2013–2023) to evaluate diabetes in pregnancy.
Results
Among Korean adults with diabetes (≥19 years), 52.4% had obesity and 61.1% had abdominal obesity. Only 39.9% achieved the glycemic target (glycosylated hemoglobin <6.5%). The obesity prevalence was higher in younger age groups, and abdominal obesity showed an upward trend over the last 12 years. Diabetes in pregnancy increased despite declining total births, with gestational diabetes mellitus (GDM) rising from 7.6% to 12.4%, and pregestational diabetes from 0.9% to 2.1%, reflecting older maternal age and pre-pregnancy obesity. Women with prior GDM had a higher risk of postpartum type 2 diabetes mellitus (hazard ratio, 6.07; 95% confidence interval, 5.97 to 6.17).
Conclusion
Obesity and abdominal obesity are highly prevalent among Korean adults with diabetes, with abdominal obesity increasing over the past decade, and obesity disproportionately affects younger adults. Diabetes in pregnancy has also increased with older maternal age and worsening pre-pregnancy metabolic health, underscoring the need for early weight-focused prevention.

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Diabetes Fact Sheet 2025: Comparative Epidemiology and Clinical Features of Obese and Non-Obese Diabetes in Korea
Jin Hwa Kim, Bongseong Kim, Se Eun Park, Seung-Hyun Ko, Sung Hee Choi, Bong Soo Cha, Kyungdo Han, Seung-Hwan Lee
Diabetes & Metabolism Journal.2026; 50(2): 267. CrossRef
Diabetes in Pregnancy in Korea: Prevalence, Clinical Characteristics, and Postpartum Comorbidities
Joon Ho Moon, Han Na Jung, Bongseong Kim, Seung-Hyun Ko, Soo Heon Kwak, Kyung-Do Han, Sung Hee Choi
Diabetes & Metabolism Journal.2026; 50(2): 280. CrossRef

Review

Guideline/Statement/Fact Sheet
Bridging Evidence and Practice: A Consensus Statement from the Korean Diabetes Association on Diabetes Screening, Pharmacological Treatment and Severe Diabetes: Jong Han Choi, Shinae Kang, Soo-Kyung Kim, Won Jun Kim, Ji Min Kim, Jaehyun Bae, Jae-Seung Yun, Eonju Jeon, Young-Eun Kim, Jae Hyun Bae, Hun Jee Choe, Young Min Cho, Seung-Hyun Ko, Sang Yong Kim, Hae Jin Kim, You-Cheol Hwang, Min Kyong Moon, Suk Chon, Seon Mee Kang, Hyuk-Sang Kwon, Mi Kyung Kim, You-Bin Lee, Se Hee Min, Jung Hwan Park, Woo Je Lee, Bong-Soo Cha, Byung-Wan Lee; Diabetes Metab J. 2025;49(6):1155-1177. Published online November 1, 2025; DOI: https://doi.org/10.4093/dmj.2025.0978

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This Korean Diabetes Association (KDA) consensus statement bridges global evidence with the Korean clinical context, where large randomized and real-world data remain limited. Recommendations required ≥80% agreement by the committee of clinical practice guideline and approval by the board of directors. The statement comprises three domains: diabetes screening aligned with Korean epidemiology; pharmacologic management guided by pathophysiology and comorbidities; and a severity construct of “severe diabetes mellitus” that links complication-based staging with metabolic grading to match therapeutic intensity to disease complexity. Compared with prior KDA guidelines, this statement introduces substantive advances in three areas. First, screening recommendations are streamlined to emphasize risk-aligned, practical implementation rather than prescriptive test sequences. Second, pharmacologic management applies an individualized framework for drug selection that jointly considers pathophysiology and comorbidities. It operationalizes individualized selection by dominant pathophysiology (insulin resistance vs. insulin insufficiency) and coexisting conditions, and formalizes treatment dynamics—early combination, timely initiation of injectables, avoidance of overbasalization, and structured deintensification. It also prioritizes agents with proven cardiovascular and renal protection and elevates management of obesity and metabolic dysfunction-associated steatotic liver disease as central goals; clinically, insulin should be initiated promptly in hypercatabolic states or suspected islet failure, and technology-enabled care—including continuous glucose monitoring and automated insulin delivery—are integral across all stages. Third, the newly introduced severity construct underpins treatment-intensity decisions across domains without reiterating prescriptive algorithms. Collectively, these recommendations provide a coherent, context-appropriate framework for diabetes screening and management in Korea and identify priorities for future evidence generation.

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Efficacy and safety of adding a fourth oral antidiabetic drug versus metformin dose escalation in patients with type 2 diabetes inadequately controlled on triple oral combination therapy (EFFORT): A 24‐week, randomized, open‐label, multicenter trial
So Ra Kim, Jun Hwa Hong, Sin Gon Kim, Soo‐Kyung Kim, Hyuk‐Sang Kwon, Jun Sung Moon, Jung Hwan Park, Jae Myung Yu, Bong‐Soo Cha, Byung‐Wan Lee
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Cardiometabolic 2.0: Redefining Cardiovascular Prevention Through SGLT-2 Inhibitors and GLP-1 Receptor Agonists
Maria-Daniela Tanasescu, Andrei-Mihnea Rosu, Alexandru Minca, Maria-Mihaela Grigorie, Delia Timofte, Dorin Ionescu
Life.2026; 16(5): 756. CrossRef

Original Articles

Guideline/Statement/Fact Sheet
2025 Clinical Practice Guidelines for Diabetes Management in Korea: Recommendation of the Korean Diabetes Association: Shinae Kang, Seon Mee Kang, Jong Han Choi, Seung-Hyun Ko, Bo Kyung Koo, Hyuk-Sang Kwon, Mi Kyung Kim, Sang Yong Kim, Soo-Kyung Kim, Young-eun Kim, Eun Sook Kim, Jae Hyeon Kim, Chong Hwa Kim, Ji Min Kim, Hae Jin Kim, Min Kyong Moon, Sun Joon Moon, Jun Sung Moon, Joon Ho Moon, Se Hee Min, Jung Hwan Park, Jaehyun Bae, Keeho Song, Ji Yoon Ahn, Jae-Seung Yun, Woo Je Lee, You-Bin Lee, Suk Chon, Eonju Jeon, Sang-Man Jin, Eugene Han, You-Cheol Hwang, Jae Hyun Bae, YoonJu Song, Jeong Hyun Lim, Jae Won Cho, Ji Yeon Choi, Yong Hee Hong, Jieun Lee, Sung Eun Kim, Ji Yun Noh, Bong-Soo Cha, Byung-Wan Lee; Diabetes Metab J. 2025;49(4):582-783. Published online July 1, 2025; DOI: https://doi.org/10.4093/dmj.2025.0469

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Pharmacotherapy
Initial Pharmacological Strategies in People with Early Type 2 Diabetes Mellitus: A Systematic Review and Network Meta-Analysis: Jong Han Choi, Bo Kyung Koo, Ye Seul Yang, Se Hee Min, Jong Suk Park, Sang Youl Rhee, Hyun Jung Kim, Min Kyong Moon; Diabetes Metab J. 2025;49(6):1252-1261. Published online April 29, 2025; DOI: https://doi.org/10.4093/dmj.2024.0660

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Background
Type 2 diabetes mellitus (T2DM) requires stringent glycemic control from an early stage to prevent complications. The most effective treatment regimen for early T2DM remains unclear. The study aimed to compare the efficacy and safety of monotherapies and combination therapies for early T2DM.
Methods
A systematic review and network meta-analysis were conducted following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Randomized controlled trials focused on glycemic control, body weight, and adverse events were included. The primary outcomes were changes in glycosylated hemoglobin (HbA1c) and odds of achieving the target HbA1c after 6 months.
Results
All combination therapies were more effective than monotherapy. Metformin+glucagon-like peptide-1 receptor agonists (GLP-1RA) (weighted mean difference [WMD] –1.50%; 95% confidence interval [CI] –2.04 to –0.96) and metformin+dipeptidyl peptidase-4 inhibitors (WMD –1.46%; 95% CI, –1.96 to –0.95) were the most effective for change in HbA1c. GLP-1RA and sodium- glucose cotransporter-2 inhibitors led to weight reduction. Apart from the increased risk of hypoglycemia with sulfonylureas, no significant differences in adverse events were observed across regimens.
Conclusion
Early combination therapy effectively improved glycemic control in patients with early T2DM without significantly increasing adverse risks. Future studies should explore new combinations, including potent GLP-1RA.

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LASSBio-1986 as a Multifunctional Antidiabetic Lead: SGLT1/2 Docking, Redox–Inflammatory Modulation and Metabolic Benefits in C57BL/6 Mice
Landerson Lopes Pereira, Raimundo Rigoberto B. Xavier Filho, Gabriela Araújo Freire, Caio Bruno Rodrigues Martins, Maurício Gabriel Barros Perote, Cibelly Loryn Martins Campos, Manuel Carlos Serrazul Monteiro, Isabelle de Fátima Vieira Camelo Maia, Renata
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Metformin beyond Glycemic Control: New Mechanistic Insights and Expanding Therapeutic Horizons
Eugene Han, Jung Ho Nam, Insuk Lee, Cheol Ryong Ku, Yong-ho Lee
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Basic and Translational Research
Macrophage-Specific Progranulin Deficiency Prevents Diet-Induced Obesity through the Inhibition of Hypothalamic and Adipose Tissue Inflammation: Chan Hee Lee, Chae Beom Park, Hyun-Kyong Kim, Won Hee Jang, Se Hee Min, Jae Bum Kim, Min-Seon Kim; Diabetes Metab J. 2025;49(4):784-797. Published online March 11, 2025; DOI: https://doi.org/10.4093/dmj.2024.0486

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Background
Chronic low-grade inflammation in multiple metabolic organs contributes to the development of insulin resistance induced by obesity. Progranulin (PGRN) is an evolutionarily-conserved secretory protein implicated in immune modulation. The generalized deletion of the PGRN-encoded Grn gene improves insulin resistance and glucose intolerance in obese mice fed a high-fat diet (HFD). However, it remains unclear which cells or organs are responsible for the beneficial metabolic effect of Grn depletion.
Methods
Considering the critical role of macrophages in HFD-induced obesity and inflammation, we generated mice with a macrophage-specific Grn depletion (Grn-MΦKO mice) by mating lysozyme M (LysM)-Cre and Grn-floxed mice. Body weight, food intake, energy expenditure, and glucose and insulin tolerance were compared between Grn-MΦKO mice and their wildtype (WT) controls under normal chow diet (NCD)- or HFD-fed conditions. We also examined macrophage activation and inflammation- related gene expression in the visceral adipose tissue and hypothalamus along with insulin and leptin signaling.
Results
Grn-MΦKO mice showed no alteration in metabolic phenotypes under NCD-fed conditions. However, upon HFD feeding, these mice exhibited less weight gain and improved glucose and insulin tolerance compared to WT mice. Moreover, HFD-induced macrophage activation and proinflammatory cytokine expression were significantly reduced in both the adipose tissue and hypothalamus of Grn-MΦKO mice, while HFD-induced impairments in leptin and insulin signaling showed improvement.
Conclusion
Macrophage-derived PGRN and possibly other Grn products play a critical role in the development of HFD-induced obesity, tissue inflammation, and impaired hormonal signaling in both central and peripheral metabolic organs.

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Tissue-specific immune and MAPK signatures in models of reduced Progranulin and Western diet
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Neurobiology of Disease.2026; 220: 107287. CrossRef
The immunometabolic network in obesity-associated insulin resistance: a systemic multi-organ and multi-cellular perspective
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Letter

Association between Type 2 Diabetes Mellitus and Brain Atrophy: A Meta-Analysis (Diabetes Metab J 2022;46:781-802): Se Hee Min; Diabetes Metab J. 2022;46(5):813-814. Published online September 19, 2022; DOI: https://doi.org/10.4093/dmj.2022.0259; [Original]

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Gray Matter Reserve Modulates the Association between Glymphatic System Function and Cognition in Patients with Type 2 Diabetes Mellitus
Wenqing Xia, Xiao Yin, Yujie Zhang, Shenghui Ge, Yuchen Chen, Jianhua Ma
Neuroendocrinology.2024; 115(1): 48. CrossRef

Response

Response: Normal Glucose Tolerance with a High 1-Hour Postload Plasma Glucose Level Exhibits Decreased β-Cell Function Similar to Impaired Glucose Tolerance (Diabetes Metab J 2015;39:147-53): Tae Jung Oh, Se Hee Min, Chang Ho Ahn, Eun Ky Kim, Soo Heon Kwak, Hye Seung Jung, Kyong Soo Park, Young Min Cho; Diabetes Metab J. 2015;39(3):270-271. Published online June 15, 2015; DOI: https://doi.org/10.4093/dmj.2015.39.3.270

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Prevalence of Impaired Glucose Tolerance/Prediabetes in Local Adult Obese Population Presenting to A Tertiary Care Hospital
Niktash Khan Hadi, Muhammad Salman Aamir, Tahir Ghaffar, Sulaiman Khan, Siraj ul Islam, Shafiullah Khan, Nizamuddin ., Muhammad Ali
Pakistan Journal of Health Sciences.2023; : 84. CrossRef

Original Article

Normal Glucose Tolerance with a High 1-Hour Postload Plasma Glucose Level Exhibits Decreased β-Cell Function Similar to Impaired Glucose Tolerance: Tae Jung Oh, Se Hee Min, Chang Ho Ahn, Eun Ky Kim, Soo Heon Kwak, Hye Seung Jung, Kyong Soo Park, Young Min Cho; Diabetes Metab J. 2015;39(2):147-153. Published online March 9, 2015; DOI: https://doi.org/10.4093/dmj.2015.39.2.147

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Background

Subjects with normal glucose tolerance (NGT) who have a high 1-hour postload plasma glucose level (≥155 mg/dL; NGT 1 hour-high) have been shown to be at higher risk for type 2 diabetes than subjects with NGT 1 hour-low postload plasma glucose level (<155 mg/dL). We compared β-cell function in subjects with NGT 1 hour-high, NGT 1 hour-low, and impaired glucose tolerance (IGT).

Methods

We classified subjects into NGT 1 hour-low (n=149), NGT 1 hour-high (n=43), and IGT (n=52). The β-cell function was assessed based on insulinogenic index (IGI), oral disposition index (DI), and insulin secretion-sensitivity index-2 (ISSI-2).

Results

Insulin sensitivity was comparable between the subjects with NGT 1 hour-high and NGT 1 hour-low. The β-cell function with/without adjusting insulin sensitivity was significantly different among the three groups. The IGI (pmol/mmol) was 116.8±107.3 vs. 64.8±47.8 vs. 65.8±80.6 (P=0.141), oral DI was 3.5±4.2 vs. 1.8±1.4 vs. 1.8±3.1 (P<0.001), and ISSI-2 was 301.2±113.7 vs. 213.2±67.3 vs. 172.5±87.5 (P<0.001) in NGT 1 hour-low, NGT 1 hour-high, and IGT, respectively. Post hoc analyses revealed that oral DI and ISSI-2 were significantly different between NGT 1 hour-low and NGT 1 hour-high but comparable between NGT 1 hour-high and IGT.

Conclusion

Among Korean subjects with NGT, those who have a higher 1-hour postload glucose level have a compromised insulin-sensitivity adjusted β-cell function to a similar degree as IGT subjects.

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One‐hour postload plasma glucose concentration in people with normal glucose homeostasis predicts future diabetes mellitus: a 12‐year community‐based cohort study
Tae Jung Oh, Soo Lim, Kyoung Min Kim, Jae Hoon Moon, Sung Hee Choi, Young Min Cho, Kyong Soo Park, HakChul Jang, Nam H. Cho
Clinical Endocrinology.2017; 86(4): 513. CrossRef
An elevated 1-h post- load glucose level during the oral glucose tolerance test detects prediabetes
Martin Buysschaert, Michael Bergman, Donald Yanogo, Ram Jagannathan, Benoit Buysschaert, Vanessa Preumont
Diabetes & Metabolic Syndrome: Clinical Research & Reviews.2017; 11(2): 137. CrossRef
Delayed insulin secretion response during an OGTT is associated with an increased risk for incidence of diabetes in NGT subjects
Yun Sun, Junfeng Han, Ziwei Lin, Lige Song, Chen Wang, Weiping Jia
Journal of Diabetes and its Complications.2016; 30(8): 1537. CrossRef
Postprandial Hyperglycemia
Tae Jung Oh
The Journal of Korean Diabetes.2016; 17(4): 233. CrossRef
β-Cell Function and Insulin Sensitivity in Normal Glucose-Tolerant Subjects Stratified by 1-Hour Plasma Glucose Values
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Diabetes Technology & Therapeutics.2016; 18(1): 29. CrossRef
Response: Normal Glucose Tolerance with a High 1-Hour Postload Plasma Glucose Level Exhibits Decreased β-Cell Function Similar to Impaired Glucose Tolerance (Diabetes Metab J2015;39:147-53)
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Diabetes & Metabolism Journal.2015; 39(3): 270. CrossRef
Letter: Normal Glucose Tolerance with a High 1-Hour Postload Plasma Glucose Level Exhibits Decreased β-Cell Function Similar to Impaired Glucose Tolerance (Diabetes Metab J2015;39:147-53)
Hee Kyung Kim
Diabetes & Metabolism Journal.2015; 39(3): 268. CrossRef

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