Study Maps Normal Gas Levels in Human Gut Including Hydrogen

Scientists looked at what gases are in your stomach and intestines and found that healthy people have pretty similar amounts of five main gases—mostly nitrogen and methane. They also discovered that eating more fiber makes you produce more of certain gases, which could help doctors figure out if something's wrong with your digestion.

Healthy human intestinal gas contains consistent proportions of five main gases: nitrogen (65.1%), methane (14.4%), carbon dioxide (9.9%), hydrogen (2.9%), and oxygen (2.3%), with dietary fiber intake positively correlating with increased production of fermented gases.

This meta-analysis reviewed 11 studies to determine what gases are normally present in the human colon (large intestine) and how diet affects them. Researchers found that healthy adults' intestinal gas is mostly nitrogen (65%), with smaller amounts of methane (14%), carbon dioxide (10%), hydrogen (3%), and oxygen (2%). They also found that eating more dietary fiber increases the amount of gases produced, especially the fermented gases like hydrogen and methane.

This study establishes baseline measurements of intestinal gases but does not directly test hydrogen water or its effects on the body. While it confirms that hydrogen is naturally present in the colon at low levels (around 3%), the research provides context for understanding digestive function rather than evidence supporting any health benefits of consuming hydrogen water. More targeted studies would be needed to determine whether hydrogen water has any physiological effects.

Background: Understanding intestinal gases volume and composition may contribute to diagnosing digestive diseases and the microbiome's status. This meta-analysis aimed to define the composition of human intestinal gases and changes associated with diet. Methods: Studies were identified…

Read the full abstract on PubMed