Fennel seeds indeed contain numerous flavonoid anti-oxidants like kaempferol and quercetin. These compounds function as powerful anti-oxidants by removing harmful free radicals from the body thus offer protection from cancers, infection, aging and degenerative neurological diseases.
Fennel seeds too are rich source of dietary fiber, 100 g seeds provide 39.8 g of fiber. Much of this roughage is metabolically inert insoluble fiber, which helps increase bulk of the food by absorbing water throughout the digestive system and easing constipation problems.
It helps lower serum LDL cholesterol levels. Together with flavonoid anti-oxidants, fiber composition of fennel helps protect the colon from cancers.
Fennel seeds are concentrated source of minerals like copper, iron, calcium, potassium, manganese, selenium, zinc, and magnesium.