One of the early things your immune system does as it’s developing is to “learn” what things it encounters are *you*. Unfortunately, this isn’t perfect, either from the very beginning or later in life, and it’ll occasionally fail to delete immune cells that target particular proteins and the like on your own cells.
The list of autoimmune diseases is unfortunately [very long](https://www.webmd.com/a-to-z-guides/autoimmune-diseases) (and that’s not anywhere near a complete list of them), but Type 1 diabetes is one of those.
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