The human body contains trillions of microorganisms living on the skin, in the mouth and especially in the gut. Together, they form the microbiome — a field of research that is rapidly changing views of health.
Scientists have found that these microbial communities may influence digestion, immunity and even aspects of mental wellbeing.
This does not mean bacteria determine health in a simple way, but it suggests the body functions as an ecosystem rather than as human cells alone.
Researchers are investigating links between the gut microbiome and conditions such as Type 2 Diabetes, inflammatory disorders and obesity.
There is growing interest in whether diet, probiotics or targeted therapies could help improve health by changing microbial balance.
However, the science is still developing. Microbiomes differ greatly between individuals, making universal treatments difficult.
Experts caution against exaggerated claims, noting that many commercial products move faster than the evidence.
Even so, microbiome research is expanding one of medicine’s central ideas: health may depend not only on the organs we can see, but also on microscopic communities we carry within us.
