I didn't have any issues with weight gain once I started eating properly again (around a week after surgery). I lost a lot before surgery due to ulcerative colitis but I went from 58kg back to my usual 75kg in 6 weeks. A lot of it depends on the underlying issue that caused the stoma and the condition of your remaining gastro intestinal tract.
Do you know if it is a loop ileostomy or an end ileostomy that you had? Loop ileostomies tend to have much higher output and less ability to absorb as they tend to be done much higher up the GI tract and therefore less time for food to absorb.
The Facebook groups I use mainly for information and advice are:
- The real ostomy support group
- Stoma & ostomy support group
- Ostomy lifestyle athletes
If I'm making a sweeping generalisation, the stoma world seems to be broadly split into 2 groups. Those who had ostomy surgery due to underlying intestinal issues (ulcerative colitis, crohns, diverticulitis etc) and those who had surgery but never had previous bowel issues (cancer, accidents, surgical complications etc).
Understandably, those who didn't have previous intestinal issues tend to struggle much more at first with coping as they had never had the previous problems and suddenly ****ing into a bag is a massive shock and has no upside. The underlying issues groups tend to have a much more positive attitude purely because surgery has alleviated a lot of their daily struggles and has given them their life back.
The reason I mention that is there can be a lot of negativity on the Facebook groups as people are going through a lot. Don't take everything as gospel, especially when it comes to what you can and can't eat! There is some great advice out there but also a lot of pseudo science and opinions based on what someone has read online.