I don't know about gastroparesis, but with IBD you
may be ok
IF in remission.
If your digestive problems have ulcers as a symptom I would be reluctant to recommend as it may cause pain.
I've tried to understand my GI tract for years, but gave up ... I think even my gastroenterologist does not know what
exactly goes on :) (They actually have 2 different opinions). I had periods of sever nausea and vomiting, ulcers and polyps, horrible cramps. But when I was fine – I could eat almost everything – and I consider SN good during such 'remissions'. That's because I personally tested my stomach for my known irritants:
garlic, salt water, pickles, acidic food, magnesium salt, olives, etc. The issues were minor: discomfort and cramps. That's normal and mild for me. Was not debilitating or painful. And my meds helped resolve it quickly. All and all, nothing serious. Now this is during so called 'remissions', when things are clear. It does not say SN is okay but it gave
me good indication. Maybe you'd find this helpful.
[EDIT] My rule was that if I'm generally "okay" = GI bad condition but not debilitating / Can process food without vomiting or pain = fine for me.