Other studies have found that eating healthier also works.

https://lifestylemedicine.org/articles/whole-food-plant-based-diet-impact-on-insulin-treated-type-2-diabetes/

“The results showed a reduction in insulin requirements by 39% after one week on the DASH diet, and a 49% decrease in insulin resistance after one week on the WFPB diet, along with other notable improvements in cardiometabolic markers.”

One week!