I don't have a comprehensive answer for that, but sometimes diabetes sneaks up on you along with pancreatic cancer. It's worth getting checked for if you don't already know your status. It takes a fine balance of enzymes and insulin for your body to get proper nutrition out of the foods you eat. I lost about 15 pounds (from 175 to 160) after Whipple, but that's where I wanted to be anyway.

While on Folfirinox, I regained the 30 pounds I had lost prior to diagnosis, so I had pounds to spare at that point. Since losing the 15 pounds post-Whipple, I've been stable as a rock at 160. I'm eating a LOT of calories every day, which would probably be fattening me up a good bit more if I had a full, functioning pancreas.