Is this the woman you’re talking about: https://www.theguardian.com/australia-news/2019/oct/11/health-retreat-run-by-banned-wellness-coach? If so, then firstly I’d like to point out that (from what I’ve seen) when she talks about diabetes in her lectures she’s talking about type 2 diabetes, not type 1 diabetes. They’re two completely different diseases with different treatments. Kind of like how cancers aren’t all the same even though they have similar names. Secondly, I would call your attention to the following excerpt: “The commission’s investigation found O’Neill never held any membership with any accredited professional health organisation and had failed to obtain any relevant health-related degrees or diplomas. She has been permanently barred from providing any health services either voluntarily or in a paid capacity, including giving lectures.”
There are a lot of people in this community who find management of their blood sugars easier when they follow a specific diet (low carb or keto, for example), but there’s no healing or recovery for type 1 diabetics from a change in diet. Type 2 diabetics might recover because their pancreases still produce some insulin. But in type 1 the pancreas does not produce any insulin at all. Talking about insulin resistance is moot at that point. No matter how you change your diet you will still need to use insulin therapy to treat yourself. Dieting might help your body use that insulin more efficiently once you have it in your system, but you’ll still need to get it from an outside source (vial and syringe, insulin pump…).
I’m not “in health” as you put it. I do happen to be a biologist, but I’m just someone who’s been living with the disease for 26 years. If I could have cured myself by changing my diet I would have a long, long time ago. If you’re looking to change your lifestyle I’d recommend you find a licensed nutritionist or certified diabetes educator and work with them. Not this Barbara O’Neill.