I can't gain weight at all. I am 5'7 and between 111 and 115 lbs now. Would love to hit 130. I eat too. Odd thing is I could keep my weight up with the bag but not the j pouch. Not sure what the difference would be? BTW, 200 cal shakes at Costco, kirkland brand, are like 10 bucks for 24. Pretty affordable and not bad tasting. It's very frustrating trying to gain.
I’m in the same boat. 5’6” with a normal fighting weight of 120-125 for my entire adult life. Dropped down to 93 while sick but now post takedown can’t seem to get above 105. I was able to get back to 115 when I had an end ileo for a year. Weird, I agree. Worry about bone health at this weight. Interestingly (and not to worry y’all featherweights), I recently saw Bo Shen and apparently the very thin and the very fat tend to have poor pouch outcomes. For the thin, it’s floppy pouches that don’t have enough padding for support. Go figure. I’m having a sinus tract repaired with him and he seems to think that may allow me to put on some weight—treating a source of low grade, chronic inflammation. So if you have any concerns about/or have pouchitis, enteropathic arthritis, subclinical infection, etc. could be the cause of the difficulty gaining.