Latent Autoimmune Diabetes in Adults (LADA)
A slow-developing autoimmune diabetes in adults, sometimes called type 1.5
Quick Facts
- Type: Autoimmune diabetes (adult-onset)
- Also called: Type 1.5 diabetes
- Onset: Adulthood, develops slowly
- Eventually needs: Insulin
Overview
Latent autoimmune diabetes in adults (LADA) is a form of diabetes that has features of both type 1 and type 2, which is why it is sometimes called "type 1.5 diabetes." Like type 1 diabetes, it is autoimmune: the immune system gradually attacks the insulin-producing cells of the pancreas. But unlike classic type 1, it develops slowly and appears in adulthood.
Because LADA begins gradually in adults and may initially be managed without insulin, it is often mistaken for type 2 diabetes at first. Over time, however, the body's insulin production declines and insulin becomes necessary. Recognizing LADA helps guide appropriate treatment and monitoring.
Symptoms
Early symptoms resemble those of other forms of diabetes and develop gradually:
- Increased thirst and frequent urination
- Fatigue
- Blurred vision
- Unintended weight loss
- Increased hunger
People with LADA are often adults who are not overweight and who may not respond as expected to type 2 diabetes treatments over time. As insulin production falls, blood sugar becomes harder to control, and the need for insulin emerges. Very high blood sugar with nausea, vomiting, and confusion is a warning sign that needs urgent care.
Causes
LADA is caused by an autoimmune process in which the immune system slowly destroys the insulin-producing beta cells of the pancreas. The reason this happens is not fully understood, but it is thought to involve:
- Genetic susceptibility, with overlap to the genes seen in type 1 diabetes
- Autoimmunity, marked by specific antibodies against the pancreas
- Environmental factors that may contribute in susceptible people
Unlike typical type 2 diabetes, LADA is not primarily driven by insulin resistance from excess weight, although a person can have both processes.
Risk Factors
- Adult onset of diabetes, often in someone of normal weight
- A personal or family history of autoimmune conditions
- Family history of type 1 diabetes
- Diabetes that does not respond well over time to typical type 2 treatments
Diagnosis
LADA can be hard to distinguish from type 2 diabetes early on. Clues and tests that help include:
- Autoantibody testing: The presence of certain antibodies, such as GAD antibodies, indicates an autoimmune process and supports LADA.
- C-peptide measurement: A test that estimates how much insulin the body is still making; in LADA it tends to decline over time.
- Clinical picture: Adult onset, often without obesity, and a gradual loss of blood sugar control despite treatment.
- Standard blood sugar tests (A1C, fasting glucose) confirm diabetes.
Treatment
Treatment evolves as the condition progresses, with the central goal of keeping blood sugar controlled:
- Early management: Some people are initially managed with lifestyle measures and non-insulin medications, similar to type 2 diabetes.
- Insulin: Because insulin production declines, most people with LADA eventually need insulin, often sooner than those with typical type 2 diabetes.
- Blood sugar monitoring to guide treatment adjustments.
- Healthy lifestyle: Balanced diet, physical activity, and not smoking.
- Managing related risks: Blood pressure and cholesterol, and screening for diabetes complications.
Working with a healthcare team helps ensure insulin is started at the right time and complications are prevented.
Prevention
LADA cannot currently be prevented because it results from an autoimmune process. However, complications can be reduced by:
- Keeping blood sugar in the target range
- Attending regular check-ups, including eye, kidney, and foot exams
- Managing blood pressure and cholesterol
- Staying physically active and not smoking
- Recognizing and promptly treating low and high blood sugar
When to See a Doctor
See a doctor if you have symptoms of diabetes such as increased thirst, frequent urination, fatigue, or unexplained weight loss, or if diabetes that was being treated as type 2 is becoming harder to control. Seek urgent care for:
- Very high blood sugar with nausea, vomiting, deep breathing, or confusion
- Severe low blood sugar with confusion or loss of consciousness if you take insulin or other glucose-lowering medicine
Frequently Asked Questions
What is LADA, or type 1.5 diabetes?
LADA stands for latent autoimmune diabetes in adults. It is a slowly developing autoimmune diabetes that appears in adulthood and shares features of both type 1 and type 2 diabetes, which is why it is sometimes called type 1.5. The immune system gradually destroys insulin-producing cells.
How is LADA different from type 2 diabetes?
Type 2 diabetes is mainly driven by insulin resistance, while LADA is autoimmune, with the body's immune system attacking insulin-producing cells. People with LADA are often adults of normal weight, and their blood sugar control tends to worsen over time until insulin is needed.
How is LADA diagnosed?
Beyond standard blood sugar tests, doctors may check for autoantibodies such as GAD antibodies, which indicate an autoimmune process, and measure C-peptide to gauge the body's remaining insulin production. Adult onset without obesity and worsening control on type 2 treatments also raise suspicion.
Will I need insulin if I have LADA?
Most people with LADA eventually need insulin, often sooner than those with typical type 2 diabetes, because the pancreas gradually loses the ability to make insulin. Some are initially managed with other medicines before insulin becomes necessary.
Can LADA be prevented?
No. Like type 1 diabetes, LADA results from an autoimmune process that currently cannot be prevented. Management focuses on controlling blood sugar and preventing complications through monitoring, healthy habits, and timely insulin treatment.
References
- American Diabetes Association.
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).
- MedlinePlus, U.S. National Library of Medicine.
- Centers for Disease Control and Prevention (CDC). Diabetes.