When most people think of diabetes, they think of Type 1 or Type 2. But there’s another form that sits in between -often misunderstood and frequently misdiagnosed. It’s commonly called Type 1.5 diabetes, medically known as Latent Autoimmune Diabetes in Adults (LADA).
This blog breaks down what Type 1.5 diabetes is, how it differs from other types, symptoms to watch for, and treatment options.
What Is Type 1.5 Diabetes?
Type 1.5 diabetes is a slow-progressing autoimmune disease. Like Type 1 diabetes, the immune system attacks the insulin-producing beta cells in the pancreas. However, unlike classic Type 1, it develops gradually and typically appears in adulthood.
Because it progresses more slowly, many people are initially diagnosed with Type 2 diabetes.
Why Is It Called “Type 1.5”?
The nickname exists because LADA shares features of both major types:
Feature | Type 1 | Type 2 | Type 1.5 (LADA) |
Autoimmune? | ✅ Yes | ❌ No | ✅ Yes |
Insulin resistance? | ❌ | ✅ | Sometimes mild |
Age at diagnosis | Often childhood | Usually adults | Adults (30+) |
Immediate insulin required? | Yes | Not always | Eventually yes |
What Causes LADA?
LADA is an autoimmune condition. The body mistakenly attacks its own insulin-producing cells. Researchers believe a combination of:
Genetic susceptibility
Environmental triggers
Immune system dysfunction
may contribute to its development.
Organizations such as the American Diabetes Association recognize LADA as a distinct autoimmune form of diabetes.
Symptoms of Type 1.5 Diabetes
Symptoms may resemble Type 2 at first but gradually worsen.
Common signs include:
Increased thirst
Frequent urination
Unexplained weight loss
Fatigue
Blurred vision
Slow healing wounds
Because symptoms develop slowly, diagnosis can be delayed.
How Is It Diagnosed?
Doctors may suspect LADA if:
Blood sugar remains uncontrolled despite oral medications
The patient is not overweight
There is a personal or family history of autoimmune disease
Key Tests:
Autoantibody testing (such as GAD antibodies)
C-peptide levels (to measure insulin production)
Fasting glucose and HbA1c
The presence of specific autoantibodies confirms the autoimmune nature of the disease.
Treatment for Type 1.5 Diabetes
Unlike typical Type 2 diabetes, LADA eventually requires insulin therapy.
Early Stage:
Lifestyle changes (diet and exercise)
Sometimes oral medications
Later Stage:
Insulin injections (often within a few years of diagnosis)
Early insulin therapy may help preserve remaining beta-cell function.
Treatment plans should be individualized and monitored by an endocrinologist.
How Is It Different from Type 2 Diabetes?
Many adults with LADA are misdiagnosed with Type 2 because:
They are diagnosed after age 30
They may not initially require insulin
Symptoms progress gradually
However, treating LADA as Type 2 for too long can delay appropriate insulin therapy and lead to poor glucose control.
Living with LADA
Managing Type 1.5 diabetes involves:
Regular blood sugar monitoring
Balanced nutrition
Physical activity
Stress management
Consistent medical follow-ups
