First, I'd be specific about type 1 in the post, because type 2 is far more common. So common that almost everyone thinks of diabetes as type 2 nowadays.

I've heard that newly diagnosed type 1's have a few options to prevent it from fully manifesting, but not sure what those options are. I found two studies that show mebendazole cured it for newly diagnosed type 1s. Fenbendazole is a drug with similar action. I have had T1D for many years, and based on that study did a 3 month course of mebendazole which unfortunately didn't work. Also did a bunch of antiparasitic treatments just to see. So far no luck.

That said, check out faustmanlab.org, especially the papers published around March - June 2020. Dr Faustman had effectively proven that it's caused by certain TB vaccines. And she has a cure that has proved extremely promising... but it's stonewalled in a long approval process, not approved yet. It's one injection, and then it takes 3.5 years. Anyway, look it up.

While on a long waitlist to participate in one of her phase 3 studies, I've gone on a full carnivore diet. Cuts down total insulin use by a lot, and there's some tantalizing anecdotes out there. Jordan Peterson in one interview said he knew someone cured of longstanding T1D by the carnivore diet. I don't have the link, but it's a Joe Rogan interview from about 5 years ago.

Also check out Dr Valter Longo. He promotes a "fasting mimicking diet" but when you look at the studies that back up his work, there are some mouse studies that show complete restoration of insulin production using repeated fasting, like a 5-fay fast 3 different times over 3 months. If I figure it out and end up curing it, I'll post. If you figure it out, come back and make a post. Good luck. WWG1WGA.