The DOI matches its Crossref record; 104 of the 107 references it cites were found in a registry or an index.
Glycaemic variability in diabetes: clinical and therapeutic implications
Abstract
Glycaemic variability is an integral component of glucose homoeostasis. Although it has not yet been definitively confirmed as an independent risk factor for diabetes complications, glycaemic variability can represent the presence of excess glycaemic excursions and, consequently, the risk of hyperglycaemia or hypoglycaemia. Glycaemic variability is currently defined by a large and increasing number of metrics, representing either short-term (within-day and between-day variability) or long-term glycaemic variability, which is usually based on serial measurements of HbA 1c or other measures of glycaemia over a longer period of time. In this Review, we discuss recent evidence examining the association between glycaemic variability and diabetes-related complications, as well as non-pharmacological and pharmacological strategies currently available to address this challenging aspect of diabetes management.
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“It also complicates both the achievement of recommended glycated hemoglobin (HbA1c) and time in range (TIR) targets [101, 102].”
From Diabetic gastroparesis: pathophysiology and impact on insulin timing choices (2026) · cites this paper as [101]
In the citing paper
“increased risk of cardiovascular disease18–20”
From Glycemic variability and cardiovascular disease in patients with type 2 diabetes (2021) · cites this paper as [19]
Citations
Cites
Effects of Intensive Glucose Lowering in Type 2 Diabetes
(2008) · New England Journal of Medicine · doi:10.1056/nejmoa0802743 · Cited by 7,888
Monnier, L., Mas, E., Ginet, C., Michel, F., Villon, L., Cristol, J.-P., & Colette, C. (2006) · JAMA · doi:10.1001/jama.295.14.1681 · Cited by 2,444
Self-citationInternational consensus on use of continuous glucose monitoring
Danne, T., Nimri, R., Battelino, T., Bergenstal, R. M., Close, K. L., DeVries, J. H., Garg, S., Heinemann, L., Hirsch, I., Amiel, S. A., et al. (2017) · Diabetes Care · doi:10.2337/dc17-1600 · Cited by 2,069
9. Pharmacologic Approaches to Glycemic Treatment: Standards of Medical Care in Diabetes—2022
American Diabetes Association Professional Practice Committee (2022) · Diabetes Care · doi:10.2337/dc22-s009 · Cited by 1,555
6. Glycemic Targets: Standards of Medical Care in Diabetes—2022
American Diabetes Association Professional Practice Committee (2022) · Diabetes Care · doi:10.2337/dc22-s006 · Cited by 1,403
Ceriello, A., Esposito, K., Piconi, L., Ihnat, M. A., Thorpe, J. E., Testa, R., Boemi, M., & Giugliano, D. (2008) · Diabetes · doi:10.2337/db08-0063 · Cited by 1,310
Self-citationBeck, R. W., Riddlesworth, T., Ruedy, K., Ahmann, A., Bergenstal, R., Haller, S., Kollman, C., Kruger, D., McGill, J. B., Polonsky, W., et al. (2017) · JAMA · doi:10.1001/jama.2016.19975 · Cited by 1,185
Feig, D. S., Donovan, L. E., Corcoy, R., Murphy, K. E., Amiel, S. A., Hunt, K. F., Asztalos, E., Barrett, J. F. R., Sanchez, J. J., de Leiva, A., et al. (2017) · The Lancet · doi:10.1016/s0140-6736(17)32400-5 · Cited by 803
Quagliaro, L., Piconi, L., Assaloni, R., Martinelli, L., Motz, E., & Ceriello, A. (2003) · Diabetes · doi:10.2337/diabetes.52.11.2795 · Cited by 772
Self-citationEfficacy and safety of degludec versus glargine in type 2 diabetes.
Marso, S. P., McGuire, D. K., Zinman, B., Poulter, N. R., Emerson, S. S., Pieber, T. R., Pratley, R. E., Haahr, P.-M., Lange, M., Brown-Frandsen, K., et al. (2017) · New England Journal of Medicine · doi:10.1056/nejmoa1615692 · Cited by 574
Research works printed but not linked: 4
- Fleisher, 2017, Association of glycemic variability in type 1 diabetes with progression of microvascular outcomes in the Diabetes Control and Complications Trial, Diabetes Care, 40, 777, 10.2337/dc16-2426 · DOI
- Fleisher, 2017, Association of glycemic variability in type 1 diabetes with progression of microvascular outcomes in the Diabetes Control and Complications Trial, Diabetes Care, 40, e164
- Monnier, 2016, Comment on the FLAT-SUGAR Trial Investigators. Glucose variability in a 26-week randomized comparison of mealtime treatment with rapid-acting insulin versus GLP-1 agonist in participants with type 2 diabetes at high cardiovascular risk, Diabetes Care, 39, e186, 10.2337/dc16-1133 · DOI
- 2018, 8. Pharmacologic approaches to glycemic treatment: Standards of Medical Care in Diabetes—2018, Diabetes Care, 41, S73
Cited by
Sorted by citations
Items 501–587 of 587
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Gil, F. M. A. (2023) · Diabetes práctica · doi:10.52102/diabet/pract.proteccionholistica.art3
Balcı, A., & Sarıaltın, S. Y. (2023) · Ankara Universitesi Eczacilik Fakultesi Dergisi · doi:10.33483/jfpau.1384461
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Najafimehr, H., Foroushani, A. R., Yekaninejad, M. S., Yousefifard, M., & Hosseini, M. (2024) · Kesmas National Public Health Journal · doi:10.21109/kesmas.v19i1.7593
Anindhita, B., Singal, A. M., Wardhani, W. I., Manikam, N. R. M., & Aditianingsih, D. (2024) · Majalah Anestesia & Critical Care · doi:10.55497/majanestcricar.v42i1.315 · Cited by 1
Grotta, R. L. (2024) · The Journal of AMD · doi:10.36171/jamd24.27.1.3
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Gökmen, G., Kılıç-Erkek, Ö., Tunç-Ata, M., Altıncık, A., Kılıç-Toprak, E., Küçükatay, V., & Özhan, B. (2024) · Trends in Pediatrics · doi:10.59213/tp.2024.114
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Noskov, S. M., Koksharova, E., Arefeva, A., Banko, V. V., Matvienko, I., Макаренко, И. Е., & Васильевич, Д. Р. (2024) · Meditsinskiy sovet = Medical Council · doi:10.21518/ms2024-345
(2021) · American Diabetes Association eBooks · doi:10.2337/9781580407694.ch07
Zhou, Y., Xie, W., Kong, C., Luo, W., Wei, H., & Zheng, J. (2024) · Biochemical Pharmacology · doi:10.1016/j.bcp.2024.116611
Unger, J. R. (2024) · Contemporary Endocrinology · doi:10.1007/978-3-031-75352-7_1
Klimontov, V. V., Shishin, K. S., Ivanov, R. A., Ponomarenko, M. P., Zolotareva, K., & Lashin, S. A. (2025) · Vavilov Journal of Genetics and Breeding · doi:10.18699/vjgb-24-107
Monnier, L., Colette, C., Renard, É., & Benhamou, P. (2025) · Médecine des Maladies Métaboliques · doi:10.1016/j.mmm.2025.03.010
Self-citationIwamoto, T., Morita, M., Hidaka, S., Sada, K., Iwamoto, M., & Shibata, H. (2025) · Journal of Diabetes and its Complications · doi:10.1016/j.jdiacomp.2025.109081
Dimitropoulou, N. M., Eussen, S. J. P. M., Schalkwijk, C. G., & de Galan, B. E. (2025) · Diabetologia · doi:10.1007/s00125-025-06469-5
Cao, L., Chen, S., Xu, Q., Chen, C., Lv, Q., Li, X., & Li, X. (2025) · Clinical and Experimental Pharmacology and Physiology · doi:10.1111/1440-1681.70049
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Massin, P., Dupas, B., Erginay, A., Feldman, S., & Lecleire-Collet, A. (2025) · Elsevier eBooks · doi:10.1016/b978-2-294-78350-0.00007-6
Li, Y., He, M., Hu, Z., Tian, H., Liu, Q., Yu, S., Li, R., Liu, N., Pan, L., Wang, W., et al. (2025) · Diabetes Obesity and Metabolism · doi:10.1111/dom.16638
Liu, S., Wang, D., & Tang, C. (2025) · World Journal of Diabetes · doi:10.4239/wjd.v16.i9.107693
Daher, R. A., Salameh, C., Ghorayeb, N. E., Safieddine, M., & Gannagé‐Yared, M. (2025) · Frontiers in Endocrinology · doi:10.3389/fendo.2025.1682970
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Jude, E. B., Saluja, S., Mannan, F., Heagerty, A. M., & Frier, B. M. (2025) · Diabetes Therapy · doi:10.1007/s13300-025-01813-9
Zhang, J., Hu, Z., & Song, C. (2025) · Scientific Reports · doi:10.1038/s41598-025-26574-0
He, H.-M., Zheng, S.-W., Xie, Y.-Y., Wang, Z., Jiao, S.-Q., Yang, F., Li, X.-X., Li, J., & Sun, Y.-H. (2024) · Figshare · doi:10.6084/m9.figshare.25200738
Seng, J. J. B., Monteiro, A. Y., Kwan, Y., Zainudin, S. B., Tan, C. S., Thumboo, J., & Low, L. L. (2021) · Figshare · doi:10.6084/m9.figshare.14205179
Su, Y., Fan, W., Liu, Y., & Hong, K. (2023) · Figshare · doi:10.6084/m9.figshare.23505265
Su, Y., Fan, W., Liu, Y., & Hong, K. (2023) · Figshare · doi:10.6084/m9.figshare.23505262
Xia, X., Xu, M., Gu, Y., Li, Y., Li, L., & Yin, J. (2024) · Figshare · doi:10.6084/m9.figshare.26598140
Wang, J., Wang, L.-L., Yang, Y.-M., Tan, H.-Q., & Zhu, J. (2024) · Figshare · doi:10.6084/m9.figshare.25770422
寛之, 小., Li, Y., Guo, K., Wu, X., Chen, C., & Lin, X. (2024) · Figshare · doi:10.6084/m9.figshare.24580519
Fang, Q., Shi, J., Zhang, J., Peng, Y. H., Liu, C., Wei, X., Hu, Z., Sun, L., Hong, J., Gu, W., et al. (2023) · Figshare · doi:10.6084/m9.figshare.23639884
Fang, Q., Shi, J., Zhang, J., Peng, Y. H., Liu, C., Wei, X., Hu, Z., Sun, L., Hong, J., Gu, W., et al. (2023) · Figshare · doi:10.6084/m9.figshare.23639881
He, H.-M., Zheng, S.-W., Xie, Y., Wang, Z., Jiao, S.-Q., Yang, F., Li, X.-X., Li, J., & Sun, Y.-H. (2024) · Figshare · doi:10.6084/m9.figshare.26679341
寛之, 小., Li, Y., Guo, K., Wu, X., Chen, C., & Lin, X. (2023) · Figshare · doi:10.6084/m9.figshare.24580406
Fang, Q., Shi, J., Zhang, J., Peng, Y. H., Liu, C., Wei, X., Hu, Z., Sun, L., Hong, J., Gu, W., et al. (2023) · Figshare · doi:10.6084/m9.figshare.23639878
Zhang, F., Shi, T., Feng, X., Shi, Y., Zhang, G., Liu, Y., & Fu, P. (2023) · Figshare · doi:10.6084/m9.figshare.24223777
Seng, J. J. B., Monteiro, A. Y., Kwan, Y., Zainudin, S. B., Tan, C. S., Thumboo, J., & Low, L. L. (2021) · Figshare · doi:10.6084/m9.figshare.14205170
Su, Y., Fan, W., Liu, Y., & Hong, K. (2023) · Figshare · doi:10.6084/m9.figshare.23505259
Seng, J. J. B., Monteiro, A. Y., Kwan, Y., Zainudin, S. B., Tan, C. S., Thumboo, J., & Low, L. L. (2021) · Figshare · doi:10.6084/m9.figshare.14205173
Seng, J. J. B., Monteiro, A. Y., Kwan, Y., Zainudin, S. B., Tan, C. S., Thumboo, J., & Low, L. L. (2021) · Figshare · doi:10.6084/m9.figshare.14205167
Seng, J. J. B., Monteiro, A. Y., Kwan, Y., Zainudin, S. B., Tan, C. S., Thumboo, J., & Low, L. L. (2021) · Figshare · doi:10.6084/m9.figshare.14205176
He, H.-M., Zheng, S.-W., Xie, Y.-Y., Wang, Z., Jiao, S.-Q., Yang, F., Li, X.-X., Li, J., & Sun, Y.-H. (2024) · Figshare · doi:10.6084/m9.figshare.25200647
Fang, Q., Shi, J., Zhang, J., Peng, Y. H., Liu, C., Wei, X., Hu, Z., Sun, L., Hong, J., Gu, W., et al. (2023) · Figshare · doi:10.6084/m9.figshare.23639887
Su, Y., Fan, W., Liu, Y., & Hong, K. (2023) · Figshare · doi:10.6084/m9.figshare.23505256
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Song, J., Wang, J., Wan, J., Lu, Y., Wang, W., Li, L., Wang, J. B., Wei, L., & Yin, J. (2026) · Frontiers in Nutrition · doi:10.3389/fnut.2025.1733037
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Development of the health economic model for type 2 diabetes considering glycaemic variability
Gu, Z., Chen, L., Zhan, K., Xi, X., & Wang, J. (2026) · Diabetes Obesity and Metabolism · doi:10.1111/dom.70451
Kim, J., Jang, E.-H., & Lee, S. (2026) · Clinical Nutrition Research · doi:10.7762/cnr.2025.0027
Imataka, K., Ida, S., Tanaka, T., Azuma, K., & Murata, K. (2026) · Diabetes Metabolic Syndrome and Obesity · doi:10.2147/dmso.s555812
Yan, X., Liang, C., Guo, M., Jiang, J., Ji, Y., Wu, A.-S., & Wei, C. (2026) · Perioperative Medicine · doi:10.1186/s13741-026-00666-5
Arethiya, N., Krammer, L., David, J. A., Bakshi, V., Basuchoudhary, A., Bhuiyan, U., Sen, S., Mazumder, R., & McNeely, P. M. (2026) · medRxiv · doi:10.64898/2026.03.04.26347604
Fluit, R. C., van der Bie, S., van den Akker, J. P. C., van Lelyveld, S. F. L., Short, K. R., Stads, S., Spronk, P. E., Bethlehem, C., Takken, R., den Uil, C. A., et al. (2026) · BMC Infectious Diseases · doi:10.1186/s12879-026-13221-w
Distinct meal timing and frequency patterns contribute to daily glycemic variability
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Chen, Y., Wan, J., Shu, W., Yang, X., Ke, H., He, W., Zhu, Y., Lu, N., & Xia, L. (2026) · Lipids in Health and Disease · doi:10.1186/s12944-026-02970-x
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Yang, W., Zhang, X., Geng, G., Qian, X., & Lu, X. (2026) · Australian Journal on Ageing · doi:10.1111/ajag.70179
Shi, X.-L., Lifang, B., Chen, J.-P., Bi-Rong, Z., Xu, D.-M., & Xu, L.-Q. (2026) · Journal of Visualized Experiments · doi:10.3791/70774
李, 晓. (2026) · Advances in Clinical Medicine · doi:10.12677/acm.2026.1652017
Xiang, X.-J., Sun, X.-L., Ma, D.-Y., Ma, L., Liu, M.-Y., Li, J.-F., Zhang, W., Wang, Y.-D., & Xie, P. (2026) · BMC Cardiovascular Disorders · doi:10.1186/s12872-026-06005-2
Jiao, Y., & Ma, J. (2026) · British Journal of Hospital Medicine · doi:10.31083/bjhm54062
Gu, J., Cook, C., Blonquist, T., & Khoo, C. (2026) · Journal of Functional Foods · doi:10.1016/j.jff.2026.107362
Ma, Y.-H., Wei, X.-H., Liu, Y., Gu, L.-P., Shen, T.-T., Fan, T.-T., Qin, Q., Zhang, A., Wang, R.-P., & Wang, Y.-F. (2026) · World Journal of Diabetes · doi:10.4239/wjd.119913
Nam, K., Kwon, H., & Lee, Y.-S. (2026) · BMJ Neurology Open · doi:10.1136/bmjno-2025-001505
Liu, Y., Shen, Q., Liu, H., Lip, G. Y. H., & Hong, K. (2026) · BMC Cardiovascular Disorders · doi:10.1186/s12872-026-06338-y
Ghafri, M. A., Awaidy, S. T. A., & Wesonga, R. (2026) · Dr Sulaiman Al Habib Medical Journal · doi:10.4103/dshmj.dshmj_21_26
Chen, Y., Xing, Z., & Hu, J. (2026) · Frontiers in Endocrinology · doi:10.3389/fendo.2026.1906084
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Xu, W., Sakal, C., Zhang, W., Chen, T., Wang, C., Zhao, Q., & Li, X. (2026) · BMC Medicine · doi:10.1186/s12916-026-05105-2 · Cited by 1
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Ra, S., Miura, H., & Iwata, T. (2026) · The Journal of Nutritional Physiology · doi:10.1016/j.jnphys.2026.100042
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Hu, J., Bo, J., He, K., Yang, L., Zhang, M., Ge, T., Ning, B., Li, G., Zou, R., & Fan, X. (2026) · Reviews in Cardiovascular Medicine · doi:10.31083/rcm50449
Yao, J., Tai, E. S., Sim, X., Müller‐Riemenschneider, F., & van Dam, R. M. (2026) · Metabolism · doi:10.1016/j.metabol.2026.156782
Li, S. J., Nuyujukian, D. S., McClelland, R. L., Reaven, P. D., Zhou, J., Zhou, H., & Li, G. (2026) · The Annals of Applied Statistics · doi:10.1214/26-aoas2218
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Tumminia, A., Papa, G., Cannarella, R., Galeano, F., Oteri, V., Amato, V., Baratta, R., Condorelli, R. A., Palazzolo, R., Gusmano, C., et al. (2026) · Diabetes Research and Clinical Practice · doi:10.1016/j.diabres.2026.113613
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Tang, M., Nathan, D. M., Wexler, D. J., Putman, M. S., Higgins, J. M., Zheng, H., Rhee, E. P., de Boer, I. H., & Kalim, S. (2026) · Journal of Diabetes and its Complications · doi:10.1016/j.jdiacomp.2026.109439
Zhu, J., Yang, Q., Meng, H., Lu, J., Ling, H., Chen, Z., & Heng, B. (2026) · Biosensors · doi:10.3390/bios16110598
Burlacu, A., Kumar, V. D., Geman, O., & Brinza, C. (2026) · Physiologia · doi:10.3390/physiologia6040062
Metadata
- Authors
- Ceriello, A., Monnier, L., & Owens, D.
- Affiliations
- Centro de Investigación Biomédica en Red Diabetes y Enfermedades Metabólicas Asociadas (ES)
- Université de Montpellier (FR)
- Swansea University (GB)
- Corresponding author
- Ceriello, Antonio
- Venue
- The Lancet Diabetes & Endocrinology
- Publisher
- Elsevier BV
- Published
- 2019-03
- Volume
- 7
- Issue
- 3
- Pages
- 221-230
- ISSN
- 2213-8587 (ISSN-L)
- OpenAlex
- W2886853964
- Cited by
- 588
- References
- 107
- Citations by year
- 2026: 58 · 2025: 71 · 2024: 78 · 2023: 81 · 2022: 81 · 2021: 96 · 2020: 87 · 2019: 36
- FWCI
- 8.42
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Lancet Diabetes & Endocrinology (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hyperglycemia and glycemic control in critically ill and hospitalized patients
- Keywords
- glycemic variability, diabetes mellitus, glucose homeostasis, glycaemic excursions, hyperglycemia, hypoglycemia, diabetes complications, HbA1c, diabetes management, glycemic control
- MeSH terms
- Blood Glucose, Diabetes Mellitus, Glycated Hemoglobin, Humans, Hyperglycemia, Hypoglycemia, Hypoglycemic Agents, Blood Glucose Self-Monitoring, Monitoring, Ambulatory, Diabetes Complications
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