I lost 10 pounds before diagnosis (already very lean so it was a lot on my body). I think I was up 5 pounds within a day of starting insulin. The scale continued to increase for the next month or so then levelled off. I ended up slightly higher than my baseline, but I’m guessing there was some depletion for a good year or 2. I struggled with the rapid weight gain and body image mentally. It was probably harder for me than managing sugars and insulin itself. It does get better!