What is type 1 diabetes?
Type 1 diabetes is an autoimmune condition in which the body's immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. Without these cells, the body cannot produce insulin — the hormone essential for moving glucose from the bloodstream into cells for energy.
People with type 1 diabetes need to replace this insulin every day, through injections or an insulin pump, for the rest of their lives. Without it, blood glucose rises to dangerous levels very quickly.
Type 1 diabetes can develop at any age, but it most commonly begins in childhood, adolescence or young adulthood. It accounts for around 10 to 15 per cent of all diabetes cases in Australia, and the number of people living with it continues to grow.
What causes type 1 diabetes?
Type 1 diabetes is not caused by diet or lifestyle. This is one of the most important — and most misunderstood — aspects of the condition.
It is an autoimmune disease triggered by a combination of genetic susceptibility and, in most cases, an environmental trigger — possibly a viral infection — that causes the immune system to turn on the body's own beta cells. The exact environmental triggers are not yet fully understood, and research in this area is ongoing.
Having a close family member with type 1 diabetes increases the risk, but many people who develop the condition have no family history of it at all.
How is it different from type 2 diabetes?
While both types affect how the body manages blood glucose, they are fundamentally different conditions with different causes, different biology and different management approaches.
Type 1 is an autoimmune condition. Type 2 is primarily a metabolic condition linked to insulin resistance, and is strongly associated with lifestyle factors and excess weight — though genetics play a significant role there too.
People with type 1 diabetes produce little or no insulin and must replace it externally, every day. People with type 2 diabetes still produce some insulin, and can often manage their condition — at least initially — through lifestyle changes and oral medication.
The two conditions are often confused, and people with type 1 diabetes sometimes encounter assumptions or stigma that doesn't apply to their situation.
What are the symptoms?
The classic symptoms of type 1 diabetes — which can develop quickly, over days to weeks — include excessive thirst, frequent urination, unexplained weight loss, extreme fatigue, blurred vision and in some cases fruity-smelling breath. In severe cases, a life-threatening condition called diabetic ketoacidosis (DKA) can develop if the condition is undiagnosed or insulin is not available.
If you or your child experiences these symptoms, it's important to see a doctor promptly.
How is type 1 diabetes managed?
Managing type 1 diabetes is a constant, around-the-clock process of balancing insulin doses against food, physical activity, stress, illness and a host of other variables that affect blood glucose levels.
Insulin delivery has evolved considerably. Many people now use continuous glucose monitors (CGMs) — small wearable devices that track glucose levels in real time — and insulin pumps that can be programmed to deliver precise doses. Increasingly, these technologies are being integrated into hybrid closed-loop systems, sometimes called "artificial pancreas" systems, that automatically adjust insulin delivery based on continuous glucose readings.
Despite these advances, managing type 1 diabetes remains demanding. It requires constant attention and can take a significant toll on mental health and quality of life — something that is increasingly recognised and addressed within diabetes care.
Regular review by an endocrinologist and diabetes care team, attention to blood pressure and cholesterol, and screening for complications including kidney, eye and nerve problems are all important parts of long-term management.
What are the complications?
Like type 2 diabetes, type 1 diabetes carries a risk of long-term complications if blood glucose is not well managed over time. These include cardiovascular disease, kidney disease, nerve damage, eye disease and foot problems. Cardiovascular risk is particularly elevated in people with type 1 diabetes, making heart health an important focus of care.
The goal of modern type 1 diabetes management is to keep blood glucose as close to the normal range as safely possible, to reduce the risk of these complications while maintaining quality of life. Keeping blood pressure and cholesterol in healthy ranges is also critical.
Is a cure possible?
Research into a cure for type 1 diabetes is one of the most active areas of diabetes science globally. Current approaches include beta cell replacement through transplantation, stem cell-derived beta cells, immune therapies that aim to halt the autoimmune attack in its early stages and, more recently, drugs that may help preserve residual insulin production around the time of diagnosis.
Progress is being made, and there is genuine optimism in the field — though a widely accessible cure remains on the horizon rather than at hand.