Insulin helps put the nutrients into your cells. I had lost a significant amount of weight before diagnosis and was skin and bones. Once starting on insulin I gained a lot of mucpscle tone back Andy the weight I needed to gain.
As others have said, after your body heals and is well nourished the hunger should subside.
What insulin are you on? Basal and bolus? Did they just tell you to take a certain amount per meal and eat certain meals? How many times a day donyiu test your blood sugar?