Is it true that if you have phobia of anaphylaxis for food, only thing to overcome it is to eat? even if your scared and have no food allergies?

Phobias: I am not a great fan of the "bulldozer" approach to phobias. A consultation with a competent therapist would work much better.

Gradual exposure: Exposure based therapy for phobias or other anxiety disorders does not jump to the most feared thing first, but by working up a hierarchy from less feared to more feared items & continuing to experience the feared stimuli & not have the feared outcome occur, paired with relaxation training, the level of fear decreases & can be eliminated. Find a therapist experienced in exposure based treatment.