Tbh I didn't gain anything after insulin with X's PG. The DE told me to worry about carbs not fats, but I was chubby anyway and didn't want to gain with my type II risk. This time I started lighter and had gained more, but again very little after starting insulin - but also the dietician did want me watching fats as well as carbs this time.
I would definitely ask the dietician HOW to do it if I were you. The other thing is that it might actually be easier for you to gain on insulin cos you often find you can eat well a bit more easily without getting all those BSL spikes. I've heard of some girls (not on here) really restricting their food intake trying to avoid insulin and obviously thats not healthy for you or baby. belfie