How does the human microbiome help with digestion?

The human microbiome, particularly the community of microorganisms residing in the digestive tract, plays a vital role in digestion by performing functions the human body cannot accomplish on its own.1

Key digestive contributions include:

• Fermentation of Fiber: Certain gut bacteria ferment complex carbohydrates and dietary fiber that pass through the small intestine undigested.1
• Energy Production: This fermentation process generates short-chain fatty acids, such as acetate, butyrate, and propionate, which provide essential energy for cells lining the colon and help reinforce the intestinal barrier.12
• Nutrient Synthesis and Breakdown: Gut microbes facilitate the synthesis of vitamin K and various B vitamins. They also assist in breaking down bile acids, cholesterol, and other dietary compounds.1

By breaking down these otherwise indigestible food components, the microbiome ensures the body can extract additional nutrients from the diet. Furthermore, these microbes provide colonization resistance, competing with harmful pathogens for nutrients and attachment sites to maintain a healthy digestive environment.321