A health condition that shares features of both type 1 and type 2 diabetes is called latent autoimmune diabetes in adults (LADA). It is a form of diabetes that occurs when the body produces antibodies that attack and gradually destroy insulin-producing beta cells in the pancreas. As a result, insulin production declines over time. In most cases, people with LADA begin to experience symptoms in adulthood, and the condition is frequently misdiagnosed as type 2 diabetes due to its slower onset.
LADA is sometimes informally called “type 1.5 diabetes”, reflecting its overlap between autoimmune (type 1) and metabolic (type 2) characteristics. Although many people are unfamiliar with this condition, it is not rare. Research suggests that approximately 4% to 12% of individuals initially diagnosed with type 2 diabetes may actually have LADA. Considering that more than 500 million adults worldwide are living with diabetes, this percentage translates into millions of people who may be affected by LADA but remain undiagnosed or misclassified.
What Are the Symptoms of LADA Diabetes?
The symptoms of this autoimmune condition are similar to those seen in both type 1 and type 2 diabetes, although they often develop gradually. Check for the most common symptoms below:
- Frequent urination (polyuria)
- Vision changes (including blurred or occasionally double vision)
- Extreme tiredness (fatigue)
- Dry or itchy skin
- Polydipsia (excessive thirst)
- Unintentional weight loss
Some individuals may also experience increased hunger, slow-healing wounds, or recurrent infections. Because these symptoms can be mild at first, they are sometimes overlooked or attributed to lifestyle factors. It is important to seek medical attention if any of these symptoms occur. Delayed diagnosis and treatment may lead to serious or even life-threatening complications.
Causes and Risk Factors
Healthcare providers do not fully understand the exact cause of LADA. However, it is believed to be an autoimmune disorder in which the immune system mistakenly attacks the insulin-producing beta cells in the pancreas. As insulin levels decrease, glucose accumulates in the bloodstream, leading to hyperglycemia.
Unlike classic type 1 diabetes, which typically develops rapidly in childhood or adolescence, LADA progresses more slowly. People with LADA may not require insulin therapy immediately after diagnosis and can sometimes maintain adequate blood sugar control for months or even years with oral medications. This gradual progression is one of the main reasons it is often mistaken for type 2 diabetes.
While anyone can develop this condition, several factors may increase the risk. These include:
- Age – Most commonly diagnosed in adults over 30 years old, often between ages 30 and 50
- Genetic factors – Strong associations with certain human leukocyte antigen (HLA) genotypes (such as HLA-DR and HLA-DQ), similar to those seen in type 1 diabetes
- Autoimmunity – Presence of autoantibodies, particularly glutamic acid decarboxylase antibodies (GADAs), which are a key marker of LADA
- Lifestyle and environmental factors – While LADA is primarily autoimmune, factors such as excess body weight, smoking, physical inactivity, chronic (long-term) stress, and poor diet may influence disease progression or contribute to insulin resistance
What Are the Potential Complications of LADA Diabetes?
Early diagnosis and appropriate treatment are essential to reduce the risk of complications. If left untreated or poorly managed, LADA can lead to serious health problems. Check some complications below:
- Diabetic ketoacidosis (DKA) – A potentially life-threatening condition in which the body breaks down fat for energy, producing ketones that accumulate in the blood.
- Cardiovascular disease – Increased risk of heart disease, stroke, and other vascular conditions.
- Microvascular complications – Including diabetic retinopathy (eye damage), nephropathy (chronic kidney disease), and neuropathy (nerve damage).
- Slow wound healing, which increases the risk of infections
- Thyroid disorders – Autoimmune thyroid diseases are more common in people with LADA
- Vision problems – For example, progressive vision loss
This is not a complete list of complications. Consulting a healthcare professional can help identify personalized strategies to reduce risks. Currently, there is no known way to prevent LADA because its exact cause remains unclear. However, early detection and proper management can significantly improve outcomes and quality of life.
Diagnosis
In many cases, individuals with LADA are initially diagnosed with type 2 diabetes. However, suspicion for LADA arises when blood sugar levels cannot be adequately controlled with oral medications (such as Metformin) and lifestyle changes. However, to confirm or rule out LADA, healthcare providers may perform specific blood tests. Examples include:
- Autoantibody tests – These tests are done to check for glutamic acid decarboxylase (GAD) antibodies, which are the most commonly detected in LADA.
- C-peptide test – It is used to measure the level of C-peptide in the blood, which reflects how much insulin the body is producing.
Low or declining C-peptide levels combined with the presence of autoantibodies strongly suggest LADA rather than type 2 diabetes.
Treatment
Managing LADA can be challenging because individuals may initially respond to oral diabetes medications, but this response is often temporary. As insulin production continues to decline, most people eventually require insulin therapy. Treatment typically includes the following options:
- Transitioning from oral medications to insulin injections when necessary
- Regular monitoring of blood glucose levels
- Lifestyle changes, including a balanced diet and regular physical activity
Early initiation of insulin in some cases may help preserve remaining beta-cell function, although this approach varies depending on the individual and clinical guidelines. The duration and intensity of treatment differ from person to person, and ongoing medical supervision is essential for optimal management.
Frequently Asked Questions
What triggers LADA diabetes?
There is no single known trigger for LADA. It develops as a result of an autoimmune response in which the immune system attacks insulin-producing cells in the pancreas. Genetic susceptibility and environmental factors may play a role, but the exact mechanism is not fully understood.
What is the life expectancy of a person with LADA diabetes?
With proper treatment and good blood sugar control, individuals with LADA can have a normal life expectancy. Many people live into their 70s, 80s, or beyond without major complications, particularly when the condition is diagnosed early and managed effectively.
Can LADA diabetes be cured?
Currently, there is no cure for LADA. Treatment focuses on managing blood glucose levels, reducing symptoms, preventing complications, and maintaining overall health and quality of life. Ongoing research continues to explore potential therapies that may slow or halt disease progression.
Is LADA diabetes the same as type 1 diabetes?
No, LADA is not exactly the same as type 1 diabetes, although they share autoimmune features. Both conditions involve the immune system attacking insulin-producing cells in the pancreas. However, type 1 diabetes usually develops quickly and at a younger age, while LADA progresses more slowly and is typically diagnosed in adulthood. People with LADA may not require insulin immediately after diagnosis, unlike those with type 1 diabetes.
Can lifestyle changes help manage LADA diabetes?
Yes, lifestyle changes can play an important role in managing LADA, especially in the early stages. A healthy diet, regular physical activity, maintaining a healthy weight, and avoiding smoking can help improve blood sugar control and overall health. However, because LADA is an autoimmune condition, lifestyle changes alone are not sufficient to stop disease progression, and most people will eventually need insulin therapy.
How quickly does LADA diabetes progress?
The progression of LADA varies from person to person. In general, it develops more slowly than type 1 diabetes but faster than type 2 diabetes. Some individuals may need insulin within months of diagnosis, while others may not require it for several years. Furthermore, factors such as age, genetics, and the level of autoantibodies can influence how quickly insulin production declines. If you have additional questions, ask your healthcare provider.
