Zanam, I just read the post about your Father's experience. I'm so sorry he has had such a hard time. My prior post was based on my personal experience. I do understand the outcome I had is not typical.
Becoming an insulin dependent diabetic overnight, with added issues of surgery and total dependency on Pancreatic enzymes for food digestion is a huge challenge.
Hope my first post did not sound insensitive. It wasn't intended that way.
I hope you Dad's situation improves soon.