For type 2 diabetes, research had shown that many patients can put the condition into remission through lifestyle changes alone. Nutritional ketosis is very effective in reversing insulin resistance.
https://www.ncl.ac.uk/magres/research/diabetes/reversal/#pub... https://www.diabetes.co.uk/news/2017/dec/newcastle-diet-achi...
Edit: Since I can't reply to another one of your posts below, I'm going to respond here. There's a "honeymoon period" after the initial symptoms of type 1 appear that yes you will still produce some insulin, for most patients it's about a year, but after that, no insulin is produced.
Zero-carb isn't a realistic long term solution. My son was diagnosed at 18 months of age. Feeding him nothing but bacon, steak and chicken is not particularly good idea for a toddler or growing child.
I think you are misinformed about Type 1 diabetes. Maybe you are thinking of some other condition?
In Type 1 diabetes, the pancreas stops producing any insulin. Insulin must be administered regularly (always, not usually) or the person will die. "Other medications" aren't required.
One's diet and exercise are relevant to Type 1 diabetes treatment, but are not a treatment method.
Source: my daughter has Type 1 diabetes
https://doi.org/10.1007%2Fs00125-013-3067-x
Diet and exercise are very effective at treating type 1 diabetes, just usually not sufficient. With a minimal or zero carb diet plus the right exercise regime, some patients find that they can go much longer between insulin doses while still maintaining good blood glucose control. In particular, I think a lot of people don't appreciate the necessity of doing resistance training to build enough skeletal muscle mass as a glucose sink.