Diabetes was a death sentence in the days before insulin was discovered and purified for human use. Frederick Banting, who taught at both the University of Toronto and Western University, came up with the idea of extracting insulin from the pancreas. He worked with Charles Best, J.J.R. Macleod and J.B. Collip in a lab at the University of Toronto to obtain insulin in a form consistently effective for treating diabetes. Banting and Macleod would go on to receive the 1923 Nobel Prize for their efforts.
Although not a cure for diabetes, insulin has enabled millions of people with the condition to live healthy lives.