The Recognition of Type 5 Diabetes: A Controversial Development in Global Health

Type 5 diabetes, also known as malnutrition-related diabetes, has been officially recognized by the International Diabetes Federation (IDF) after decades of debate. This condition, which primarily affects individuals in low- and middle-income countries, is believed to impact approximately 20-25 million people worldwide. It is characterized by insulin deficiency without resistance, typically arising from chronic undernutrition, often beginning in early childhood. The IDF's recognition occurred during the World Diabetes Congress in April 2023, prompting calls for other health authorities, such as the World Health Organization (WHO), to follow suit.

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Initially described in Jamaica in 1955, type 5 diabetes was acknowledged by the WHO in the 1980s but was removed from its classifications in 1999 due to insufficient evidence linking malnutrition directly to diabetes. The ongoing debate has centered on whether malnutrition causes diabetes or is a consequence of it, as well as the diagnostic challenges associated with identifying this form of diabetes. Critics argue that the lack of consensus on diagnostic criteria and treatment protocols has hindered recognition and research efforts.

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The IDF is currently developing standardized diagnostic criteria and treatment guidelines for type 5 diabetes, which is essential given the unique metabolic profile of affected individuals. Unlike type 1 and type 2 diabetes, patients with type 5 diabetes present as young, lean, and insulin-deficient but maintain insulin sensitivity. This distinct profile necessitates careful management of insulin treatment to avoid complications such as hypoglycemia, particularly in regions where food insecurity is prevalent.

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Dr. Meredith Hawkins, chair of the IDF Type 5 Diabetes Working Group, has been a vocal advocate for the recognition of this condition. She stated, "Malnutrition-related diabetes is more common than tuberculosis and nearly as common as HIV/AIDS, but the lack of an official name has hindered efforts to diagnose patients or find effective therapies." Hawkins emphasizes the urgency of addressing this neglected disease, which can be fatal if mismanaged.

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Despite the IDF's recognition, some experts remain skeptical. They argue that the diagnostic ambiguity surrounding type 5 diabetes complicates its classification and treatment. Concerns persist regarding the reliability of current diagnostic markers and the potential for misdiagnosis, which could lead to inappropriate treatment strategies. Critics assert that without robust evidence and clear guidelines, the recognition of type 5 diabetes may be premature.

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The IDF's working group is tasked with establishing a global research registry and creating training for healthcare professionals to better understand and manage type 5 diabetes. As more clinical evidence emerges, the ongoing debate may either resolve or deepen, depending on the clarity of diagnostic criteria and treatment efficacy.

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• “Malnutrition-related diabetes is more common than tuberculosis and nearly as common as HIV/AIDS, but the lack of an official name has hindered efforts to diagnose patients or find effective therapies. I'm hopeful that this formal recognition as type 5 diabetes will lead to progress against this long-neglected disease that severely debilitates people and is often fatal.” — Dr. Meredith Hawkins, Chair, IDF Type 5 Diabetes Working Group

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• “Inappropriate insulin treatment could induce hypoglycaemia, which can be a particular risk in settings with food insecurity and where glucose monitoring might not be affordable,” — Dr. Meredith Hawkins, Albert Einstein College of Medicine

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The recognition of type 5 diabetes marks a significant step in addressing global health disparities, yet it also underscores the complexities of diabetes classification and treatment in the context of malnutrition.

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