If there is no improvement on hydrolyzed diet trial, what does this imply about dietary allergens?

• A. It conclusively rules out dietary allergens.
• B. It indicates the diet was effective.
• C. It means the patient has a non-food intolerance.
• D. It suggests dietary allergens could still be involved.

Answer: (D)

Hydrolyzed diets aim to reduce exposure to common food allergens by breaking proteins into smaller, less antigenic pieces, but this is not a perfect test. If there is no improvement on a hydrolyzed diet, it does not rule out dietary allergens because some allergenic proteins may remain and provoke reactions, certain individuals react to trace amounts or to components not fully eliminated by hydrolysis, and some responses are non-IgE mediated and may not respond to protein hydrolysis. Other factors such as insufficient trial duration, adherence issues, or multiple dietary triggers can also mask potential benefits. So, dietary allergens could still be involved despite the lack of improvement.