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On 11 January 1922 , a boy was very ill in a hospital . The hospital was in the city of Toronto . His name was Leonard Thompson . He was very thin and weak . In this illness , the blood has too much sugar . The body needs insulin to use sugar . It comes from the pancreas . The pancreas is an organ near the stomach . In 1922 , Leonard 's kind of diabetes almost always killed people . The main help was a very strict diet . In 1921 , two men in Toronto worked on this . Frederick Banting was a doctor . Charles Best was a student . They took insulin from the pancreas of dogs . Then they tested it on a dog with diabetes . On 11 January , Leonard received the first injection . But it did not work well . The liquid was not clean . His blood sugar went down only a little . James Collip was a chemist . On 23 January , Leonard received the clean liquid . Soon his blood sugar was normal . Leonard lived for thirteen more years with insulin . Today , millions of people with diabetes live with insulin . The first patient was one thin boy in a hospital in Toronto . 
