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The billions of microbes that live in the human body are an important component to nutrition and health. The microbes in the digestive tract are known collectively as the gut microbiome and can play multiple roles in human health, starting before birth and continuing throughout life. There is not a specific definition of a “healthy” microbiome; rather, the health of the microbiome is individualized to a person based on their exposure to diet, medications, environment, and toxins.