Breath Hydrogen and Methane as Biomarkers of Fiber Intake

This study is designed to examine if mobile phone-based breath hydrogen and methane monitors can be used as a biomarker of dietary fiber intake.

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Key information

Conditions

Healthy Eating

Age range

18 year–80 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

University of Oklahoma Health Sciences

Oklahoma City, Oklahoma, 73104, United States

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Must be enrolled in parent trial (NCT07219706)

Exclusion criteria

Not enrolled in parent trial (NCT07219706)

Treatment and study plan

Breath Tester

Other

Participants enrolled in a fiber-focused study will be offered a Food Marble to see if the data provided correlates with self-reported fiber intake

Primary outcomes

Breath methane

Time frame: Measured daily for three months

Measured daily for three months, represented in parts per million (ppm)
Breath hydrogen

Time frame: Daily for three months

Measured daily for three months, represented in parts per million (ppm)

Sponsors and collaborators

Lead sponsor

University of Oklahoma

Other

Registry information

Official study title

Exploring the Utility of Breath Hydrogen and Methane as Biomarkers of Total Dietary Fiber Intake: A Pilot Study

Important dates

Study start: 2026
Primary completion: 2026
Study completion: 2026
First posted: Jan 29, 2026
Registry last updated: Apr 6, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

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