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For type-2 diabetes, various forms of dietary therapy such as nutritional ketosis have proven extremely effective in reducing or even eliminating many patients' need for exogenous insulin. But we usually refer to that as putting the condition into remission rather than a "cure".

https://doi.org/10.1530/EDM-22-0295

This.

I was diagnosed with type 2 diabetes about two and a half years ago. After doing some research, I put myself on a strict keto diet. Within about a month, my A1C went from over 13 to hovering around 6 and has stayed there. Never took any diabetes medication.

I do give myself a "vacation" from the diet about once a month, which I usually reserve for a special occasion.

Do you find that this requires an unusual amount of self-control? I have no reason to manage my food intake, but in the limited times where I have I've found it quite difficult
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> But we usually refer to that as putting the condition into remission rather than a "cure"

Because that’s accurate. Someone following this treatment plan is still at elevated risk of recurrence. Once you’re cured of the flu, your ex ante chances of catching it again are no higher. (We don’t have a cure for diabetes per se. Insulin controls but doesn’t cure it.)

I need someone who control his type 2 diabetes with the ornish diet which is fat vegetarian no sugar or simple carbs...

And maybe the secret is the no sugar nor simple carbs

The secret is lots of veggies, fruits, and whole grains. The calorie density is low so it's easy to stay in a normal calorie range or even a deficit which is key for reducing risk of type 2 diabetes. Fat, especially Saturated fat causes insulin resistance. Many studied show this. Please show me any long term studies or a culture that are metabolically healthy on long term keto diets. Take a look at Virta health. Tons of money spent on low carb diets that achieved very little.

Try a book like "fiber fueled". That's a diet that is actually sustainable.

There is no "secret" here. While saturated fat might play some role in type-2 diabetes (there appears to be a genetic factor for some patients), the immediate cause of insulin resistance is excessive carbohydrate intake. The Virta Health approach of nutritional ketosis appears to be quite effective and sustainable for many patients.

https://doi.org/10.1007/s13300-018-0373-9

https://doi.org/10.1016/j.nut.2014.06.011