Molecular hydrogen in human breath originates from microbial fermentation in the gut
the verdict
SUPPORTED
the evidence backs this
confidence 86/100
Molecular hydrogen detected in human breath is primarily produced through microbial fermentation of carbohydrates within the gastrointestinal tract.
Evidence for · 4
Colonic hydrogen absorption: quantification of its effect on hydrogen accumulation caused by bacterial fermentation of carbohydrates.
1993 · cited by 45
Paper [2] confirms that breath hydrogen originates from bacterial fermentation in the colon after carbohydrate ingestion.
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More for · 3
A proof of concept infant-microbiota associated rat model for studying the role of gut microbiota and alleviation potential of <i>Cutibacterium avidum</i> in infant colic.
2022 · cited by 3
Paper [7] links high levels of excreted hydrogen directly to microbial fermentation by gut bacteria such as Veillonella.
Lactose intolerance and probiotics: from pathophysiological mechanisms to clinical applications.
2026 · cited by 2
Paper [8] explains that undigested carbohydrates reaching the colon are fermented by gut flora, generating gas measurable in breath tests.
The role of intestinal gases in pediatric functional constipation: a narrative review of pathophysiology and emerging therapeutics.
2025 · cited by 0
Paper [10] identifies microbial gas metabolism, including hydrogen produced by the gut microbiota, as a key driver in gastrointestinal physiology.