Story perspectives

Study Reveals Nocebo Effect in Gluten Sensitivity Claims

10/15/2025

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Summary

Story summary

A study published in The Lancet Gastroenterology & Hepatology assessed wheat and gluten effects on irritable bowel syndrome symptoms.
It found no differences in symptom flare-ups among wheat, purified gluten, or a gluten-free sham bar.
The study observed a strong nocebo effect, where expectation of symptoms triggered adverse reactions regardless of actual intake.
Even after results were shared, many participants stayed on a gluten-free diet, reflecting entrenched beliefs about triggers.

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Story summary

A study published in The Lancet Gastroenterology & Hepatology assessed wheat and gluten effects on irritable bowel syndrome symptoms.
It found no differences in symptom flare-ups among wheat, purified gluten, or a gluten-free sham bar.
The study observed a strong nocebo effect, where expectation of symptoms triggered adverse reactions regardless of actual intake.
Even after results were shared, many participants stayed on a gluten-free diet, reflecting entrenched beliefs about triggers.