1. Fennel is a hairy food. Generally speaking, hairy food refers to food that can easily cause or induce certain diseases. Fennel belongs to the fever, wind food, the volatile oil component has a certain stimulating effect, eating too much will cause some itching, allergies and other skin diseases.

2, fennel contains some allergens, some friends of the immune system is weak, for pollen, dust and other components of the existence of allergic reactions, so belonging to the allergic group of people do not eat fennel better.