What Is 'Double Diabetes'?
The term 'double diabetes' describes a situation where a person with autoimmune Type 1 diabetes also develops insulin resistance, the primary characteristic of Type 2 diabetes. In Type 1, the body's immune system mistakenly attacks and destroys the insulin-producing
cells in the pancreas. This means individuals must take insulin to live. Insulin resistance, on the other hand, occurs when the body's cells don't respond effectively to insulin, making it harder for glucose to enter the cells for energy. When these two conditions coexist, managing blood sugar becomes significantly more complex.
Why Does Insulin Resistance Develop?
Several factors can lead a person with Type 1 diabetes to develop insulin resistance. A primary cause is excess body weight, particularly fat around the abdomen, which is a well-known trigger for insulin resistance in the general population. Other key lifestyle factors include physical inactivity and a diet high in processed foods and saturated fats. Additionally, a family history of Type 2 diabetes can increase a person's genetic predisposition. Hormonal changes during puberty or pregnancy can also temporarily affect insulin sensitivity. Even the long-term use of high doses of injected insulin can, over time, make the body less responsive.
Recognising the Warning Signs
For someone with Type 1, the signs of developing insulin resistance can be subtle at first. A key indicator is needing increasingly higher doses of insulin to manage blood sugar levels that were previously stable. Other symptoms include persistent fatigue, as cells struggle to get the glucose they need for energy, and unexplained weight gain, especially around the waist. Some people may notice darkened, velvety patches of skin in areas like the neck or armpits, a condition known as acanthosis nigricans. Persistent high blood sugar readings despite following a careful management plan are a major red flag that warrants a discussion with a doctor.
How Is Double Diabetes Diagnosed and Managed?
Diagnosing double diabetes involves a combination of clinical evaluation and lab tests. A doctor will review the patient's history, including weight changes and daily insulin usage relative to their body weight. Blood tests can confirm the presence of autoantibodies, which are characteristic of Type 1 diabetes, while other tests can assess the degree of insulin resistance.Management requires a two-pronged approach. Insulin therapy remains essential, but the focus shifts to also improving insulin sensitivity. This often involves significant lifestyle changes, such as adopting a diet focused on whole foods, reducing processed carbohydrates, and engaging in regular physical activity. In some cases, doctors may prescribe medications typically used for Type 2 diabetes, such as metformin, on an an 'off-label' basis to help reduce insulin resistance.
The Long-Term Health Implications
Managing double diabetes effectively is critical because the combination of conditions increases the risk of long-term complications. Individuals with double diabetes have a higher likelihood of developing cardiovascular problems like high blood pressure, heart disease, and stroke. The risk of microvascular complications, including kidney disease (nephropathy) and eye damage (retinopathy), is also elevated. Furthermore, the presence of insulin resistance can contribute to conditions like non-alcoholic fatty liver disease. Proactively addressing insulin resistance not only helps with blood sugar control but also mitigates these serious long-term health risks.
