I am going to honestly admit I did try it. I was laid up from a car accident and without exercising or merely doing my daily work around the house I gained 11 lbs. I hated it. I am chubby enough as it is and of course gaining weight does not help control the bg. So I cut back and felt okay until the third day and I was terribly sick with nausea etc. I will never try that again. It was awful and what I had to do was to eat 300 less calories a day. But I still have the 10-11 lbs and finally now I can exercise some it is coming back off slowly though.
It is tempting because Humalog will put the weight on but it is because all the calories are being utilized now and doc said I had to eat a bit less as my body needed less and was utilizing it better.
Seems like we gain if we have strict control and lose if we don't and hard to find the right number of calories that we actually need.
Don't do it.