They are also known as "fartichokes" for good reason. Of all the foods that can cause flatulence, this one is by far, to the best of my knowledge, the king. It is because the Jerusalem Artichoke is so full of inulin, higher in percentage than the other flatus inducing foods. Good for diabetics (good for managing blood sugar – inulin is not insulin), but too bad for the world as this would have been a fabulous root crop otherwise.