Hydrogen breath testing explained

Breath Testing and Digestive Health

Breath testing to investigate digestive incompatibilities was first proposed in the 1970s.

Today, breath testing is carried out in some of the world’s leading hospitals. The primary use of these tests is to help identify food intolerances, which may be contributing to digestive difficulties.

Over the years, many studies have supported the science behind breath testing — and also behind FoodMarble’s devices, AIRE and AIRE 2.

How Breath Testing Works

When food isn’t fully broken down by the digestive system, it passes into the colon, where bacteria break it down in a process called fermentation. This process produces gases, mainly hydrogen and methane.

These gases can build up in the colon, sometimes leading to symptoms such as pain, bloating, and diarrhea. They are also absorbed into the bloodstream and eventually released in the breath. By measuring these gases in the breath, it’s possible to see whether the body is struggling to digest certain foods.

Making Breath Testing Accessible

Traditionally, breath testing was available only in hospital settings. With FoodMarble, breath testing is now accessible at home. This empowers you to explore how your body responds to different foods in a way that is personal, convenient, and informative.

A Note on SIBO

A growing number of hospitals now use breath testing to help diagnose Small Intestinal Bacterial Overgrowth (SIBO).

SIBO occurs when bacteria that normally live in the large intestine begin to grow in the small intestine. This can interfere with digestion and lead to symptoms such as bloating, abdominal pain, diarrhea, or constipation. During a clinical breath test for SIBO, a patient drinks a sugar solution (often lactulose or glucose), and the levels of hydrogen and methane gases in their breath are measured over time. Abnormal gas patterns may suggest that bacteria are fermenting food in the small intestine instead of where they should be - in the colon.

It's important to clarify that FoodMarble consumer devices are not designed to diagnose, treat, cure, or prevent SIBO. It is vital to work with a healthcare provider if you suspect SIBO and wish to formally diagnose this medical condition or any other for that matter.

Healthcare at FoodMarble

The FoodMarble Healthcare team can connect you with a qualified healthcare provider from our registered network. These providers are experienced in guiding patients through SIBO breath testing, interpreting the results, and advising on appropriate treatment options.

Reach out to our team for information on the next steps: healthcare@foodmarble.com

Updated on: 17/09/2025