I too had a bad reaction from chicory root. It is listed as the second ingredient in Think Thin Divine bars. I got really bad gas, felt stomach upset, and it lasted several hours. I ate one the next day and sure enough, it was back. I now knew it was from these bars.
I returned them to the store for a refund and will never eat them again. I would rather eat gluten and suffer whatever consequences come my way than eat something that is marketed as healthy from a health food store. I also read that if you have an allergy to ragweed, you should avoid chicory. The fact that they tell you pregnant or nursing mothers should "never" consume chicory, what does that say? I hope this post helps others who may be experiencing the same thing.