Cruciferous Vegetables
Broccoli, cabbage, cauliflower, sprouts, and kale are healthy and common vegetables, but they all tend to cause gas and bloating, particularly when eaten raw. Cruciferous vegetables are rich in sulfur and when broken down in the colon, they release hydrogen sulfide. These also contain a compound called raffinose that can not be broken down by humans, so it goes undigested through the stomach and small intestine. The liver works harder to break it down when raffinose reaches the intestine, contributing to bloating and discomfort.