Fennel seeds may aid healthy digestion, and treat bloating, gas, or cramps, and may also act as a diuretic. According to herbalists, fennel seed is a compelling guide to digestion. It can help the smooth muscles of the gastrointestinal system relax and reduce gas, bloating, and stomach cramps. Fennel Seeds has diuretic properties; therefore, drinking fennel tea can help remove toxins from the body, which in turn, may contribute to weight loss. Fennel seeds are responsible for kick-starting your metabolism. A good digestive system is a key to lose weight, the healthy way.