Digestion relies on a combination of processes that break down food so the body can absorb nutrients. Two important players in this process are digestive enzymes and the gut microbiome.

Digestive enzymes are produced by the body to break down carbohydrates, fats and proteins during digestion. At the same time, trillions of microorganisms living in the gut — known collectively as the gut microbiome — also help process certain foods that the body cannot digest on its own.

Although digestive enzymes and gut bacteria both play roles in digestion, they perform different functions. Understanding how these systems work together helps explain how the body breaks down food and maintains digestive balance.

Founder Insight

Hanna Sillitoe first became interested in the role of the gut microbiome while naturally treating her psoriasis. During this time she began exploring research showing how gut bacteria influence digestion, inflammation and immune responses.

This discovery led to a deeper interest in how the microbiome supports many systems in the body, including digestion and nutrient metabolism.

What Are Digestive Enzymes?

Digestive enzymes are proteins produced by the body that help break down food into smaller molecules that can be absorbed into the bloodstream.

These enzymes are released at different stages of digestion, including in the mouth, stomach and small intestine.

Key digestive enzymes include:

• Amylase, which helps break down carbohydrates
• Protease, which helps break down proteins
• Lipase, which helps break down fats

Digestive enzymes work by breaking large food molecules into smaller components such as amino acids, fatty acids and simple sugars. These smaller molecules can then be absorbed through the lining of the small intestine.

Without digestive enzymes, the body would struggle to access many of the nutrients contained in food.

The Gut Connection

The Role of Gut Bacteria in Digestion

While digestive enzymes handle much of the early stages of digestion, the gut microbiome plays a crucial role in later stages of the digestive process, particularly in the large intestine.

The microbiome consists of trillions of microbes that help break down substances that human digestive enzymes cannot process.

Breaking down fibre

Humans lack the enzymes required to digest many types of dietary fibre. Instead, gut bacteria ferment fibre in the large intestine.

During fermentation, microbes produce compounds known as short-chain fatty acids, which support gut health and help maintain the intestinal lining.

Producing beneficial compounds

Gut bacteria also produce a range of beneficial metabolites that support the gut environment and interact with immune cells.

Supporting microbial balance

A diverse microbiome helps maintain balance within the digestive system and supports many aspects of digestive function.

Interaction with the immune system

A large proportion of the body's immune cells are located in the digestive tract. Gut microbes interact closely with these immune cells and help regulate immune responses within the gut environment.

Digestive Enzymes vs Gut Bacteria

Although both digestive enzymes and gut bacteria support digestion, they perform different but complementary roles.

Together, these systems help ensure that food is efficiently broken down and processed within the digestive system.

What Research Shows

Research into digestion increasingly highlights the important role of the gut microbiome in metabolic processes within the digestive tract.

Key findings include:

• Microbial fermentation of fibre – Gut bacteria ferment dietary fibre to produce short-chain fatty acids that help support the intestinal lining.

• Microbiome diversity and digestive health – Greater microbial diversity is associated with a more resilient digestive environment.

• Microbial metabolites and gut health – Compounds produced by gut microbes interact with immune cells and influence metabolic signalling.

• Microbiome contribution to digestion – Studies estimate that the gut microbiome contributes a wide range of metabolic functions that complement the body’s own digestive processes.

These findings highlight how digestion depends on both the body’s digestive enzymes and the activity of the gut microbiome.

Sources

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

Koh A et al. From dietary fibre to host physiology: short-chain fatty acids as key bacterial metabolites. Cell, 2016.

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

Gill SR et al. Metagenomic analysis of the human distal gut microbiome. Science, 2006.

Supporting the Microbiome

Supporting a healthy microbiome may help maintain digestive balance.

Eat a wide variety of plant foods

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

Increase fibre intake

Fibre acts as fuel for microbes in the large intestine, supporting fermentation and the production of beneficial compounds.

Include fermented foods

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

Maintain healthy lifestyle habits

Sleep, physical activity and stress management can influence microbiome balance.

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 Digestive Enzymes and Gut Bacteria

Do digestive enzymes replace gut bacteria?

No. Digestive enzymes and gut bacteria perform different roles in digestion and work together within the digestive system.

What happens if the microbiome becomes imbalanced?

Changes in microbiome composition may influence digestion, fermentation and gut balance.

Can probiotics support digestion?

Some studies have explored how probiotics may influence microbiome diversity and digestive function.

Conclusion

Digestion depends on a complex interaction between the body’s own digestive enzymes and the trillions of microbes living in the gut.

Digestive enzymes help break down carbohydrates, fats and proteins during the early stages of digestion, while gut bacteria ferment fibres and produce beneficial compounds in the large intestine.

Together, these systems help maintain balance within the digestive tract and support many aspects of digestive health.

Understanding how digestive enzymes and gut microbes work together highlights the important role of the microbiome in overall digestion.

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.