What is the human microbiome?
Quick Answer
The microbiome is the vast community of trillions of bacteria, viruses, fungi and other microorganisms that live in and on the human body, especially in the gut.
The Full Story
The human body hosts roughly as many microbial cells as human cells, estimated at around 38 trillion. Most live in the large intestine, where they help digest fibre, produce vitamins like K and B12, train the immune system and protect against harmful pathogens. The composition varies between individuals and is influenced by diet, antibiotics, birth method and environment. Research links the gut microbiome to conditions ranging from obesity and diabetes to depression and autoimmune diseases. The Human Microbiome Project, launched in 2007, has greatly expanded our understanding of this “hidden organ”.
Key Facts
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Suggested video title for this topic:
"The hidden organ — trillions of microbes inside you"