If you're already on insulin you might not get rid of it completely but getting down to a healthy bodyfat percentage (15-20% for men, 20-25% for women) and exercise will greatly reduce the amount of insulin needed as your sensitivity will be increased. Some will get off of insulin entirely if their pancreas isn't already dead.

Here's a good interview with Ted Naiman about it: https://youtu.be/jfzmlXIPccs?si=32DB_MHHP6YzAamu