Suspicion of a specific foodstuff causing symptoms

Foodstuff reintroduced in the diet

Elimination of the foodstuff from the diet (diagnostic avoidance diet)

SYMPTOM DIARY

Symptoms clearly reduced or completely erased

SYMPTOM DIARY

Symptoms not reduced

No allergy to the specific foodstuff

End

Allergy to the specific foodstuff

Therapeutic avoidance diet

Foodstuff reintroduced in the diet (challenge/home experimentation)

Symptoms reappear

Symptoms do not appear