Irritable Bowel Syndrome and Nickel Allergy: What Is the Role of the Low Nickel Diet?

Overview

This Journal of Neurogastroenterology and Motility original article from the Gemelli Hospital allergology, gastroenterology, nuclear medicine, and pulmonology consortium tests whether a low-nickel diet improves gastrointestinal symptoms in IBS patients with nickel sensitization, and characterizes the intestinal permeability profile of these patients using 51Cr-EDTA excretion. The study confirms that nickel-sensitive IBS patients have substantially elevated intestinal permeability versus controls (5.91 percent vs 2.20 percent 51Cr-EDTA excretion) and that all GI symptoms except vomiting improve significantly on a low-nickel diet. The finding positions IBS with nickel sensitization as a candidate subtype of SNAS amenable to dietary intervention.

Key numbers

On low-nickel diet, all GI symptoms except vomiting improved significantly in the Ni-sensitive IBS cohort. Compromised intestinal permeability was documented in all enrolled patients.

Methods (brief)

Single-site prospective study at Gemelli Hospital. Inclusion: IBS by Rome criteria + positive nickel patch test + symptom flare on oral Ni challenge. Intervention: structured low-nickel diet. Outcome: GI symptom response plus pre/post 51Cr-EDTA intestinal permeability quantification.

Implications

• Certification: Establishes the IBS-Ni-allergy-low-Ni-diet axis as a documented clinical subtype with quantitative permeability biomarker support. Mechanistically consistent with the Ni-driven gut-barrier disruption framework in Ghosh et al. 2024.
• Microbiome: Direct evidence that dietary nickel affects intestinal-barrier integrity in humans; the 5.91 percent vs 2.20 percent 51Cr-EDTA difference is a measurable biomarker of the leaky-gut consequence of Ni exposure.
• Courses: Standard reference for IBS-and-nickel clinical management.

Wiki pages updated on ingest

• Nickel
• Nickel in microbial pathogenesis

Update history

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