Fennel seed essential oils increase the release of digestive fluids and enzymes, which helps digestion. Fennel seeds include antispasmodic and anti-inflammatory compounds such as anethole, fenchone, and estragole. They are excellent for constipation, indigestion, and bloating. To have the best benefits, drink fennel tea to maintain your digestive system healthy and happy. Fennel seeds contain fiber as well, and despite their small size, they have a significant fibre content. This can help your gut health even more. Fennel seeds help to better heart health by increasing fibre levels in your diet, since multiple studies have connected higher fibre diets with a decreased risk of cardiac illnesses.