Most reviews for [Fiber One Chewy bars](http://rads.stackoverflow.com/amzn/click/B008BLFNLG) appear united that the Chicory Root Extract causes great amount of flatulence.

For example:

> 
> Tasted good but had no idea why I suddenly had such painful and relentless gas. This is not normally an issue with me. When I read the label I didn't see anything that seemed like it would cause such a problem. Then I realized that the first ingredient on the list was something I didn't recognize: Chicory Root Extract. I Googled it and discovered that it is actually a mild laxative and well known for causing terrible gastric issues.
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Are these claims exaggerated or is Chicory Root Extract indeed known to cause such symptom?