In general, the young leaves are milder in flavor and more tender. Gather those instead of the older leaves. At first, take only enough for a sample. This is a reasonable precaution, since you cannot be sure if you'll like the flavor, or if the plant will agree with your system. A good example is the Jerusalem artichoke.
Inulin is the same thing that causes flatulence from beans.
Therefore, eating them can cause flatulence, in some cases terribly painful flatulence. So don't eat a large helping of them until you know exactly how they react with your body. Day lily tubers can have the same effect. The general rule is to avoid plants that have milky sap . The exceptions to this are dandelion and milkweed.