OK to give fish oil to diabetic+IBD cat?

I've been seeing posts online about fish oil being good for IBD cats. Angel has both diabetes and IBD, and I was considering giving him fish oil a few times a week. Would appreciate any thoughts on this. Thank you . (I give it to our arthritic civvie Akie, so thought maybe Angel could get some too...)

 

Hmmm. This article seems to imply that it is not a good idea: https://onlinelibrary.wiley.com/doi/full/10.1111/jvim.12033