Diabetes is one of these illnesses that really throws medical history into perspective. It's so common, everyone knows someone who has it, people live pretty normal lives with it. And yet, a hundred years ago, it was an instant death sentence. And then we were able to treat people with insulin and yet - it was extremely disabling. The insulin was extracted from animal pancreas had severe side effects, even with how similar the hormones are, there is always an averse reaction to proteins from foreign species, especially during long-term treatment. Injections had to be given every few hours, at-home-tests were only available from the 70s onwards. Insulin pumps entered the market in the 80s. Genetically produced insulin - humanized insulin - was first available in the US in 1982, in many countries only around the year 2000.
In 1930, having diabetes type I would basically mean being hospital bound, being woken every few hours for regular injections.
In 1965, you'd be able to live at home and get by with a very strict diet and a few timed injections. You'd struggle with chronical side effects. Having children wasn't done - passing on your genes would be immoral, and it might not even be legal for you to marry.
In the year 2000, you'd have a device clipped to your belt that would measure your blood sugar and distribute insulin, you only need to change the needle a few times a day. You might even be allowed to join in P.E. class
In 2025, you stick on two patches that do the same thing. They're synchronized through your phone.
That wasn't fate. It's not natural development that made diabetes a common chronic illness. It was hundreds of people who cared. It was the people who created the keto diet. It was the people who came up with tests. The ones who went through different species, trying to figure out the closest analogon to human insulin. It was the people who fought in court to get genetically produced insulin approved for medical use. It was people who looked at a rare, incurable disease and said "but what if it wasn't?"