Very interesting question. I've been eating a variety of nuts and seeds, except for peanuts (which aren't really nuts). Although I would love to have an excuse to eat Reese's Peanut Butter Cups, peanuts give me boils.
Here's a link to a nutrient chart for nuts and seeds:
Joy - 47 yrs and counting; Dx Colitis Dec 06 (also had IBS); Currently in remission
Figuring out how to reduce a flare or get into remission is a trial and error experience. Don't expect your GI to have all the answers. He was trained in making diagnoses, prescribing medications, and surgically removing the colon. He was not trained in alternative treatments. That's why they are called alternative treatments.
What works for me: Fecal transplantation, Probiotics, Anti-inflammatory foods, No HFCS, No foods high in fructose, No artificial sweeteners, No pro-inflammatory foods when flaring, Vitamins, Lexapro (for stress).