A comparison of two isocaloric diets for a diabetic with blood sugar control as the endpoint. Some carbohydrates in menu 1 were replaced with fat of equal caloric value and insulin was optimised in each case.
The diet with a higher proportion of fat produced much better blood sugar control for Dave. How well will it work for you? The scientific way to test this is to perform an N-of-1 trial.
If you are keen, learn the technique yourself, because most doctors don't have a clue how to do it.