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Complications and type 1 diabetes
What the long-term risks of type 1 actually are, how far they have fallen, and what the evidence says you can do about them.
This is the part of type 1 many people dread most. There are no photographs of wounds or amputations and no worst-case stories. The aim is to make an existing fear the right size, not to add a new one. Four things before you start:
- These are risks, not destinies. Nothing here is something that will happen to you. Every number describes a group of people over decades, and every one of those numbers has fallen.
- The numbers online are old. Most published rates come from people diagnosed between 1950 and 1990, before A1C testing, modern insulins, pumps and sensors. They are not a forecast of your life.
- Complications are not a verdict. They happen to people who did everything asked of them. Biology, access, cost, other illnesses and luck all play a part.
- You are probably already worried. Worry about future complications is the most commonly reported problem among people living with type 1. These pages are here to make that fear accurate, not bigger.
Tone matters here: hopeful information given at diagnosis still shapes how people manage their diabetes one to five years later.
- What the DCCT showed, and what it costThe 1983–1993 trial that proved managing glucose lowers the risk of complications, the 30-year follow-up, and the trade-off it came with.
- Eyes, kidneys and nervesWhat happens to eyes, kidneys and nerves in type 1, how common it is, how far the rates have fallen, and what can improve.
- Heart, feet, DKA and lost hypo warningsHeart disease, foot care, diabetic ketoacidosis and hypoglycemia unawareness: what matters most, and how much of it can be prevented or reversed.
- Screening, targets and the five leversThe Canadian screening schedule for type 1, what guideline-level success really looks like, and the five risk factors that shape long-term outcomes.
- A complication is not a verdict on effortWhy complications happen to people who did everything asked of them, how cost and access shape care in Québec, and why diabetes distress is normal.
- Disordered eating, and what families can sayHow fear of complications can feed insulin restriction, and the words that help or hurt when you support someone with type 1.