Typically, how many diet trials are recommended before concluding non-food-related problem?

• A. Three to five trials
• B. Only hydrolyzed trials
• C. Usually one novel and one hydrolyzed trial
• D. No trials

Answer: (C)

To reliably identify whether symptoms are linked to diet, two trials are typically used: a hydrolyzed protein diet trial and a novel protein diet trial. The hydrolyzed trial reduces the allergenicity of proteins, so if symptoms improve on this regimen, it points toward a protein-related reaction rather than a non-food cause. The subsequent novel protein trial tests for causality with a protein source the patient hasn’t consumed before; if symptoms reappear with the novel protein, it strengthens the case for a dietary trigger. Using both approaches gives clearer evidence than a single trial and helps distinguish diet-related issues from non-food problems. So, the usual plan is one hydrolyzed trial plus one novel protein trial.