For some, hummus can cause gas or bloating due to the high fiber content, saponins, and/or oligosaccharides in the chickpeas. Especially if you have Irritable Bowel Syndrome, you may notice this with hummus containing garlic, as garlic also contains a lot of oligosaccharides. Using canned chickpeas, omitting the garlic, and keeping your serving size to about 2 tablespoons of hummus can help to reduce gas and bloating.