The History of Insulin: Diabetes Treatment Since 1922
Before Insulin, a diagnosis of Type 1 Diabetes was often a rapid, heartbreaking decline. Doctors had few options beyond extreme dietary restriction, and even that couldn’t replace what the body was missing. Understanding the history of Insulin isn’t just a science story—it’s the turning point in the broader history of diabetes management.
Introduction to Insulin in Diabetes Treatment
Insulin is a hormone made by the pancreas that helps glucose move from the bloodstream into cells for energy. When the body makes little or no Insulin—or can’t use it well—blood glucose rises, leading to serious short- and long-term complications.
Let’s be real: it’s hard to overstate the importance of Insulin in modern diabetes care. For people with Type 1 Diabetes, Insulin is essential for survival. For many people with Type 2 Diabetes, it becomes a key therapy when other treatments aren’t enough.
Who Discovered Insulin?
The discovery of Insulin is often credited to a team effort in Toronto in 1921–1922. Frederick Banting and Charles Best are the names most people recognize, working in the lab of J.J.R. Macleod. Biochemist James Collip later helped refine the extract so it could be used more safely in humans.
It’s also important to acknowledge the wider scientific groundwork. Researchers had long suspected the pancreas played a role in diabetes. The breakthrough was isolating a pancreatic extract that could reliably lower blood glucose without causing severe toxicity.
For a readable overview, see the American Diabetes Association’s history piece: https://diabetes.org/blog/history-wonderful-thing-we-call-Insulin and Diabetes UK’s summary: https://www.diabetes.org.uk/our-research/about-our-research/our-impact/discovery-of-Insulin.
The First Person Treated with Insulin: Leonard Thompson
In January 1922, Leonard Thompson—a 14-year-old with severe diabetes—became the first person to receive Insulin injections successfully. Early attempts weren’t perfect. The first injection caused side effects because the extract wasn’t pure enough. After further refinement, a subsequent injection improved his condition and reduced dangerous metabolic markers.
That moment matters because it moved Insulin from theory to real-world Insulin treatment. It also set the stage for scaling production so more patients could access it.
The Transformation of Diabetes Management with Insulin
Once Insulin became available, the entire arc of diabetes care changed. People who previously had little hope could survive and plan a future—school, work, families, all of it. That’s a win, even if Insulin therapy still requires constant attention.
Over time, Insulin evolved from early animal-derived preparations to highly purified forms, then to human Insulin made with recombinant DNA technology, and later to Insulin analogs designed to better match the body’s needs. These developments sit among the most meaningful diabetes breakthroughs in medicine.
From a single extract to tailored regimens
Modern Insulin therapy usually includes basal Insulin (background coverage) and bolus Insulin (mealtime correction). Dosing is personalized and influenced by food, activity, illness, stress, and more.
Monitoring changed the story, too
Insulin works best when paired with glucose monitoring—first urine testing, then fingersticks, and now Continuous Glucose Monitoring (CGM). Honestly, the combination of better Insulin options and better data is what makes today’s care feel dramatically different from the early decades.
Some medicines can affect glucose readings or how you feel—always double-check labels and ask your clinician when you’re unsure.
The Centennial Impact: 100 Years of Insulin
The FDA’s historical exhibit on “100 Years of Insulin” highlights how regulation, manufacturing, and innovation shaped access and safety: https://www.fda.gov/about-fda/fda-history-exhibits/100-years-Insulin.
A century after Insulin 1922, Insulin remains a cornerstone therapy. Yet big challenges persist: affordability, global access, and the day-to-day burden of managing dosing and monitoring. The science progressed fast; the systems around it haven’t always kept up.
If you want to talk with others about navigating Insulin therapy now—beyond the history—community discussions can be helpful: https://www.reddit.com/r/DiabetesDiary/.
Conclusion: The Legacy of Insulin in Modern Medicine
The discovery of Insulin turned diabetes from a near-certain tragedy into a manageable condition for millions. Its legacy isn’t just the first injection or the Nobel Prize headlines—it’s the everyday reality of people living longer, fuller lives with diabetes.
If you’re tracking Insulin, meals, and glucose trends, Diabetes diary Plus can be a practical way to keep records organized for you and your care team.
