Fennel seeds have been used in India for very long to help digestion. The oil has various positive benefits on weight loss including help speed up metabolism and suppress appetite. By increasing the metabolic rate, it helps the body burn calories faster and accelerates weight loss. Fennel also has the ability to help minimise fat deposits in the bloodstream by using stored energy sources. Holistic healing practitioners recommend adding small amounts of fennel into your diet with other foods and in teas.