I eat nutritional yeast all the time without any issues. I love it on kale chips and made into cheezy/pesto sauce served on zucchini noodles.
I once read somewhere on kickas, it can be an issue for people with Crohns, but I have Colitis (currently in remission) and never had any issues with nutritional yeast.
Rawking Raw Food Living! http://bettyrawker.com/
Enjoying a plant based mostly raw vegan diet 90% of the time, with a few raw or cooked seafoods every now and then. Taking curcumin daily and combined with a super Low Starch Diet am pretty much pain free!