Following up on our conversations about the human body, let's explore the impact of the microbiome on human health.  Discuss how the trillions of microbes living in and on our bodies influence our immune system, digestion, and overall well-being.  How can we promote a healthy microbiome? 
<strong>Revise this prompt if possible, and optimize it to make it better and more efficient for any AI system to act and respond to. 
If possible run your optimized version.</strong>