Type 5 diabetes is a malnutrition-related form of diabetes formally recognized and named by the International Diabetes Federation (IDF) in 2025. It develops when chronic undernutrition — often beginning before birth or in early childhood — leaves the pancreas unable to make enough insulin. It mainly affects lean, undernourished young people in low- and middle-income countries and differs from both type 1 and type 2.
Type 5 Diabetes: The Short Answer
If you want the quick version before the details:
- It is a distinct, malnutrition-related form of diabetes. The IDF formally named it "type 5 diabetes" at its 2025 World Diabetes Congress, giving an old, under-recognized condition a clear label and a global research agenda.
- The core problem is too little insulin, not insulin resistance. Chronic undernutrition appears to impair how the pancreas develops, so the body cannot produce enough insulin — unlike type 2, where the body resists the insulin it makes.
- It mostly affects lean, young people who have faced long-term undernutrition, particularly in parts of Asia and Africa. It is not caused by excess weight.
- It is easy to misdiagnose. Because affected people are thin and young, they are often mislabeled as type 1 or type 2 — and the wrong treatment can be dangerous.
- It is not the same as type 2 diabetes. If you have type 2, this is background context, not a change to your plan — the levers that steady your blood sugar stay the same.
The rest of this article explains what type 5 diabetes is, how it differs from type 1 and type 2, who is at risk, how clinicians are approaching diagnosis and management, and what it means (and doesn't mean) if you have type 2.
What Type 5 Diabetes Actually Is
Type 5 diabetes is diabetes driven by chronic malnutrition rather than by autoimmune damage or excess weight. The condition itself is not new — clinicians in undernourished regions have described diabetes in thin, young patients for decades. What changed in 2025 is that the International Diabetes Federation formally recognized it as its own category and named it "type 5," establishing a working group to define diagnostic criteria and treatment guidance.
There is history behind the name. Malnutrition-linked diabetes was previously called malnutrition-related diabetes mellitus (MRDM) and was included in the World Health Organization's diabetes classification in 1985, only to be removed in 1999 because the evidence at the time was considered insufficient. Renewed research has since strengthened the case that undernutrition-driven diabetes is biologically distinct, which is what prompted the IDF to bring it back with a clearer definition.
The proposed mechanism is different from the more familiar types. Long-term undernutrition — especially during pregnancy and the first years of life — appears to interfere with the development and function of the beta cells in the pancreas that produce insulin. The result is a body that makes too little insulin (an insulin-deficiency problem) rather than one that struggles to use insulin (the insulin-resistance pattern behind most type 2 diabetes). Because affected people are typically thin, low insulin production, rather than insulin resistance, is thought to be the leading driver.
How Type 5 Diabetes Differs From Type 1 and Type 2
The three types share one outcome — blood sugar that runs too high — but the causes and the people affected are quite different. Understanding those differences is exactly why a separate name matters: the right treatment depends on the right diagnosis.
- Type 1 diabetes is an autoimmune condition. The immune system attacks and destroys the insulin-producing cells, so the body makes little or no insulin. It often appears in childhood or adolescence and requires lifelong insulin. The American Diabetes Association describes it as unrelated to lifestyle or body weight.
- Type 2 diabetes is primarily a problem of insulin resistance, where the body no longer responds well to its own insulin and eventually cannot keep up. It is strongly linked to excess weight, inactivity, and genetics, and is the most common form worldwide. The ADA notes it can often be managed with lifestyle changes and medication.
- Type 5 diabetes is tied to chronic undernutrition and appears as impaired insulin production in lean, young people. Unlike type 1, it is not autoimmune. Unlike type 2, it is not driven by excess weight or insulin resistance.
Here is how the three compare at a glance:
| Feature | Type 1 | Type 2 | Type 5 |
|---|---|---|---|
| Main cause | Autoimmune destruction of insulin-making cells | Insulin resistance, often with genetics and excess weight | Chronic malnutrition affecting insulin production |
| Core problem | Little or no insulin | Body resists its own insulin | Too little insulin produced |
| Typical body type | Any; often lean at diagnosis | Often overweight, but not always | Lean, low body weight |
| Typical age | Often childhood/teens | Usually adults, rising in youth | Adolescents and young adults |
| Most affected | Worldwide | Worldwide, rising with obesity | Low- and middle-income regions of Asia and Africa |
| Relation to weight | Not weight-driven | Strongly weight-linked | Linked to undernutrition, not excess weight |
The key takeaway: type 5 sits apart because its root is a lack of adequate nutrition over time, not the immune system and not the weight-and-resistance pattern most people picture when they hear "diabetes."
Who Is at Risk for Type 5 Diabetes
Type 5 diabetes is largely a condition of chronic undernutrition, so risk concentrates where long-term food insecurity is common. The IDF and researchers point to several overlapping factors:
- Long-term undernutrition, especially early in life. Poor nutrition during pregnancy and in the first years of childhood is thought to shape how the pancreas develops, setting the stage for impaired insulin production later.
- Low body weight and a lean build. Affected people are typically thin rather than carrying excess weight, which is one reason the condition is so often missed.
- Adolescence and young adulthood. Type 5 tends to appear in younger people rather than in older adults.
- Living in low- and middle-income regions. The burden falls heavily on parts of Asia and Africa, where chronic undernutrition is more widespread. Researchers estimate that tens of millions of people worldwide may be affected.
Because these risk factors are so different from the ones most diabetes education focuses on — excess weight, inactivity, family history of type 2 — type 5 has historically flown under the radar. Naming it is meant to help clinicians recognize the pattern and screen for it in the right settings.
How Type 5 Diabetes Is Diagnosed and Managed
This is where the new classification matters most in practice. Because people with type 5 are lean and young, they are frequently mislabeled — sometimes as type 1, sometimes as type 2 — and the wrong label can lead to the wrong care.
- The misdiagnosis risk is real. Treated as type 1, a person may be given full insulin doses their body doesn't need, which can push blood sugar dangerously low. Treated as type 2, the underlying insulin-production problem and nutritional needs can be overlooked.
- A distinct diagnosis guides distinct treatment. Unlike type 1, many people with type 5 are not prone to the rapid, life-threatening ketoacidosis that defines untreated type 1, which is one clue clinicians can use to tell the conditions apart.
- Nutrition is central, not optional. Because the condition is rooted in undernutrition, careful nutritional support — alongside carefully tailored management — is a core part of care rather than an afterthought.
- Formal guidelines are being developed. In 2025 the IDF established a working group to define diagnostic criteria, a global registry, and treatment protocols specific to type 5, so recognition and care can become more consistent.
If you or someone you know may fit this picture — a young, thin person with high blood sugar and a history of chronic undernutrition — the practical step is a conversation with a clinician who can order the right tests and interpret them in context. Do not assume a type based on this article, and never start, stop, or change any treatment on your own.
If You Have Type 2 Diabetes, What Does This Mean for You?
For the vast majority of people managing diabetes day to day, type 5 is important background — not a change to your plan. Type 5 is a specific, malnutrition-related condition concentrated in undernourished populations. Type 2 diabetes, which is far more common, is a different condition with a different cause: insulin resistance linked to weight, activity, genetics, and everyday habits.
If you have type 2, the levers that steady your blood sugar are the same ones they've always been — balanced, higher-fiber meals, movement after eating, muscle, sleep, and stress management. Our guides on how to control diabetes and understanding metabolic health walk through those foundations in detail. The arrival of a new named type doesn't change what works for type 2 — it simply gives an under-recognized group of patients the clarity they've been missing.
Frequently Asked Questions
What is type 5 diabetes?
Type 5 diabetes is a malnutrition-related form of diabetes formally named by the International Diabetes Federation in 2025. It develops when chronic undernutrition — often starting before birth or in early childhood — impairs the pancreas's ability to produce enough insulin. It mainly affects lean, young people in low- and middle-income countries and is considered distinct from both type 1 and type 2 diabetes.
How is type 5 diabetes different from type 1 and type 2?
Type 1 diabetes is autoimmune, where the immune system destroys insulin-producing cells. Type 2 diabetes is mainly insulin resistance, often linked to excess weight. Type 5 diabetes is different from both: it is driven by chronic malnutrition, appears in lean and young people, and involves too little insulin production rather than autoimmune damage or insulin resistance.
What causes type 5 diabetes?
The leading explanation is long-term undernutrition, especially during pregnancy and early childhood. Chronic lack of adequate nutrition appears to interfere with how the insulin-producing beta cells in the pancreas develop and function, leaving the body unable to make enough insulin. This is why the condition is described as malnutrition-related rather than weight- or lifestyle-driven.
Who does type 5 diabetes affect?
Type 5 diabetes primarily affects lean, undernourished adolescents and young adults in low- and middle-income regions, particularly parts of Asia and Africa. Because these individuals are thin and young — not the profile most people associate with type 2 diabetes — the condition is often missed or misdiagnosed. Researchers estimate tens of millions of people worldwide may be affected.
Is type 5 diabetes new?
The condition itself is not new — clinicians have described malnutrition-linked diabetes for decades, and it was included in the World Health Organization's classification as malnutrition-related diabetes mellitus in 1985 before being removed in 1999. What is new is the formal 2025 recognition and naming by the International Diabetes Federation, along with a working group to define diagnostic criteria and treatment.
Why does naming type 5 diabetes matter?
A clear name and definition help prevent misdiagnosis. People with type 5 are often mislabeled as type 1 or type 2, and the wrong treatment can be harmful — for example, giving full insulin doses meant for type 1 can push blood sugar dangerously low. Recognizing type 5 as distinct allows for more accurate diagnosis and nutrition-centered care.
Does type 5 diabetes affect people with type 2 diabetes?
Not directly. Type 5 is a specific, malnutrition-related condition, while type 2 diabetes is a separate and far more common condition driven by insulin resistance. If you have type 2, type 5 is useful context but does not change your management. The same lifestyle foundations — balanced meals, movement, sleep, and stress management — remain the core of steadier blood sugar.
References
- International Diabetes Federation. idf.org
- WHO. Diabetes fact sheet. who.int
- WHO. Malnutrition fact sheet. who.int
- ADA. Type 1 Diabetes. diabetes.org
- ADA. Type 2 Diabetes. diabetes.org
- NIDDK. What Is Diabetes? niddk.nih.gov
Next Steps
Type 5 diabetes is a reminder that "diabetes" is not one condition but several, each with its own cause. For most people, though, the day-to-day work of steadying blood sugar comes back to the same reliable habits — and for type 2 diabetes specifically, those habits are well established and within reach.
If you're living with type 2 and ready to turn those habits into a structured routine, the Done With Diabetes™ program, a holistic approach to type 2 diabetes, brings nutrition, movement, sleep, and stress work together inside a guided 56-day plan. Get started with Vynleads to take the next step.