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How was insulin discovered?

In 1920, Dr. Frederick Banting investigated whether diabetes might be related to pancreatic function. Two years later, he tested an insulin extract on a 14-year-old boy with severe diabetes who was close to death. The boy responded well to the treatment, as did other volunteers. Banting found that adjusting blood glucose levels helped the insulin work more effectively. For the first time in history, doctors had a treatment for diabetes. In 1923, Banting was awarded the Nobel Prize in medicine.

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