If you look at diabetes today, many people say that Type 2 diabetes can be reversed if we act on time. This idea did not come suddenly. It came slowly, step by step, over many years. Doctors kept observing patients, noticing patterns, and asking simple questions. This is the story of how our understanding of diabetes changed over the last 100 years.
1921: The Year Insulin Was Found
In 1921, four scientists made a discovery that changed diabetes care forever: Frederick Banting, Charles Best, John Macleod, James Collip. They discovered insulin and found a way to use it safely in humans. Before this, diabetes was very scary. People believed that once someone got diabetes, nothing could really help. After insulin was discovered, doctors saw for the first time that diabetes could be controlled. The first insulin injection was given to a young boy with Type 1 diabetes. His sugar levels were very high, his weight had dropped, and his condition was serious. After insulin was given, he slowly started getting better. This gave hope to doctors and patients all over the world.
Why Insulin Matters in Diabetes Reversal
You may think insulin is only about treatment, not reversal. But insulin discovery helped doctors understand something very important. Once insulin was known, doctors could start asking questions. These questions slowly led to the idea of insulin resistance.
Insulin Sensitivity and Insulin Resistance
A doctor named Harold Himsworth noticed something interesting. Some patients responded well to insulin injections. Their sugar levels came down easily. But other patients did not respond much, even when insulin was given. He explained that some bodies are sensitive to insulin, and some are not. This was the first time doctors talked about insulin resistance. This also helped doctors understand the difference between Type 1 diabetes, where insulin is needed, and Type 2 diabetes, where insulin is present but does not work well.
Measuring Insulin Changed Everything
For a long time, doctors could not measure insulin in the blood. They could only measure sugar. This changed when two scientists, Rosalyn Yalow and Solomon Berson, developed a method to measure insulin levels. When insulin was finally measured, doctors were surprised. In many people with Type 2 diabetes, insulin levels were already very high. This meant the body was producing insulin, but the body was not responding to it properly. This confirmed that Type 2 diabetes is mainly a problem of insulin resistance.
HOMA-IR: Finding Insulin Resistance Early
Later, doctors developed a simple calculation called HOMA-IR to understand insulin resistance. This work is linked to researchers like David Matthews. By using fasting sugar and fasting insulin values, doctors could see how hard the body was working to control sugar. This helped identify people who were at risk of diabetes even before sugar levels became high.
Insulin Resistance Affects More Than Sugar
In 1988, Gerald Reaven explained that insulin resistance does not only cause diabetes. He showed that insulin resistance is linked with: weight gain, high blood pressure, high cholesterol, and heart problems. Most importantly, he explained that insulin resistance is not permanent. It can be reduced. This idea became very important for diabetes reversal.
Finding Diabetes Before Sugar Increases
Another doctor, Joseph Kraft, studied thousands of people using sugar tests along with insulin tests. He found that many people had normal sugar levels but very high insulin levels. This condition showed that the body was already under stress. Diabetes was developing silently. This helped doctors understand that diabetes starts much earlier than people think.
Food, Carbohydrates, and Insulin Resistance
For many years, people believed that fat was the main reason for weight gain and diabetes. One doctor, Robert Atkins, questioned this idea. He noticed that when people reduced carbohydrates, their weight reduced and sugar control improved. Later studies supported this and showed that high carbohydrate intake increases insulin resistance. This shifted focus towards glucose load and food quality.
What All This Means Today
When we connect all these findings, one thing becomes clear. Type 2 diabetes develops because insulin resistance increases over time. Insulin resistance increases because of long-term high glucose load. Insulin resistance can be reduced with the right steps. That is why Type 2 diabetes can be reversed in many cases.
Want to Learn This in More Detail?
If you want to understand this topic more clearly, you can also watch our YouTube video where this entire journey is explained step by step. Seeing and listening often helps connect these ideas better than reading alone.
Watch the animated timeline — from insulin discovery to modern reversal science.
