Bloating is a common digestive complaint that affects many people from time to time. It is often described as a feeling of abdominal fullness, pressure or swelling, sometimes accompanied by gas or discomfort.

While occasional bloating can be linked to diet or digestive changes, researchers are increasingly exploring how the gut microbiome may influence digestive symptoms such as bloating.

The trillions of microbes living in the digestive system help break down food, ferment fibre and regulate many processes within the gut. Scientists are now studying how changes in microbiome composition may influence gas production, digestion and gut sensitivity.

Understanding the relationship between bloating and the microbiome may help explain why supporting gut health is becoming an important area of interest in digestive wellbeing.

Founder Insight

Hanna Sillitoe first became interested in the role of the gut microbiome while researching treatment options for her psoriasis. During this time she began exploring emerging research into how gut bacteria influence digestion, inflammation and immune responses.

This experience sparked a long-standing interest in how the microbiome may influence many aspects of health, including digestive comfort and gut balance.

What Is Bloating?

Bloating refers to the sensation of fullness or swelling in the abdomen. It may occur after eating or develop throughout the day.

For some people, bloating is simply caused by temporary digestive changes. However, it can also be linked to factors such as gas production in the digestive tract, slower digestion or increased gut sensitivity.

Common causes of bloating include:

• gas produced during digestion
• changes in gut motility (how food moves through the digestive tract)
• sensitivity within the digestive system
• certain foods that are more difficult to digest

Because digestion involves both the body’s own enzymes and the activity of gut microbes, researchers are exploring how the microbiome may influence bloating and digestive symptoms.

The Gut Connection

The Microbiome and Gas Production

One of the primary ways gut microbes influence digestion is through fermentation.

When bacteria break down certain carbohydrates and fibres that humans cannot digest on their own, they produce gases such as hydrogen, methane and carbon dioxide. This process is a normal part of digestion.

However, changes in microbiome composition may influence how much gas is produced and how it is processed within the digestive system.

Fermentation of dietary fibre

Many fibres and complex carbohydrates reach the large intestine intact, where they are fermented by gut bacteria.

During this process, microbes produce beneficial compounds called short-chain fatty acids, which support gut health. At the same time, fermentation also produces gas.

Microbiome balance

A healthy microbiome typically contains a wide variety of bacterial species that help maintain balance within the digestive system.

When this balance is disrupted — a condition known as dysbiosis — fermentation patterns and gas production may change.

Gut sensitivity

Researchers are also exploring how the microbiome may influence gut sensitivity and communication between the digestive system and the nervous system, often referred to as the gut–brain axis.

This may influence how people experience digestive sensations such as bloating.

What Research Shows

Scientists have increasingly studied how the gut microbiome may influence digestive symptoms such as bloating.

Key research findings include:

• Microbiome differences in digestive conditions – Studies have found that people with digestive symptoms may show differences in gut microbiome composition compared with healthy individuals.

• Gas production and fermentation – Research shows that gut microbes ferment certain carbohydrates and fibres, producing gases as a natural part of digestion.

• Gut–brain communication – The microbiome interacts with the nervous system through the gut–brain axis, which may influence how digestive sensations are perceived.

• Microbiome diversity and digestive balance – Greater microbial diversity is often associated with a more stable gut environment.

Although research continues to evolve, these findings highlight the growing interest in how the gut microbiome may influence digestive comfort and bloating.

Sources

Flint HJ et al. Links between diet, gut microbiota composition and gut metabolism. Proceedings of the Nutrition Society, 2012.

Gasbarrini A et al. Methodology and indications of hydrogen breath testing in gastrointestinal diseases. Gut, 2009.

Bowe WP & Logan AC. The gut–brain–skin axis. Gut Pathogens, 2011.

Sender R et al. Revised estimates for the number of human and bacterial cells in the body. PNAS, 2016.

Supporting the Microbiome

Several lifestyle habits may help support microbiome diversity and digestive balance.

Eat a wide variety of plant foods

Plant diversity provides fibre and nutrients that help nourish beneficial gut bacteria.

Increase fibre gradually

Fibre helps feed gut microbes, but increasing intake gradually may help the digestive system adapt.

Include fermented foods

Fermented foods such as kimchi, kefir and sauerkraut contain naturally occurring microorganisms that may support microbiome diversity.

Support healthy digestion

Eating slowly, staying hydrated and maintaining regular meal patterns can help support digestive function.

Consider probiotic support

Some people choose to support their microbiome with probiotics — live microorganisms designed to help maintain microbial balance within the digestive system.

Common Questions About Bloating and Gut Health

Can gut bacteria cause bloating?

Gut bacteria naturally produce gas during digestion, particularly when fermenting certain carbohydrates and fibres.

Why do some foods cause bloating?

Some foods contain carbohydrates that reach the large intestine where they are fermented by bacteria, producing gas as part of digestion.

Can probiotics help with bloating?

Researchers are studying how probiotics may influence microbiome balance and digestive symptoms. Results vary depending on the strain and individual factors.

Conclusion

Bloating is a common digestive experience that can be influenced by many factors, including diet, digestion and gut sensitivity. Increasingly, research suggests that the gut microbiome may play a role in how food is fermented, how gas is produced and how digestive sensations are experienced.

Maintaining a healthy and diverse microbiome may therefore help support overall digestive balance and gut wellbeing.

Understanding the role of gut bacteria in digestion highlights how the trillions of microbes living in the digestive system contribute to many aspects of digestive health.

Some people choose to support their microbiome with probiotics — live cultures designed to help maintain a healthy balance of gut bacteria. Learn more about our Multi-Strain Biotic and how it supports gut health.