The best man at my sister's wedding was diagnosed as type 1 and stuck to the advice he was given - for decades he was always going hypo, lost his job as a HGV driver, the house, family - almost lost his mind.
When his consultant retired he got an early morning phone call from the new one telling him to stop the insulin.
He visited my brother in law in his man cave - the garage under the house, talked to him all afternoon, then left and has not been heard of since.