We can all be thankful for the present day insulins, devices, and knowledge about diabetes.
This picture was taken in 1930, only nine years after the discovery of insulin. The girl is injecting the animal insulin near her knee, where there is muscle, and very little fatty tissue. There was no fast acting insulin back then, and injecting in the muscle caused the insulin to act much faster. I injected that way for many years, starting in 1945.