The microbiome affects brain and behavior, but what affects the microbiome? Well, brain and behavior also do-it’s a two way street-but dietary deficiencies can also affect the microbiome! It turns out that a magnesium deficiency affects the microbiome in a way that produces depression. Make sure you get enough magnesium, as deficiency can also affect your muscles.
To learn how the microbiome affects the brain and behavior, and many other concepts about our bacterial gut symbionts, please check out my book The Symbiont Factor: http://tinyurl.com/pgl98sj
Reference:
The Symbiont Factor Blog 
Thank you.
I have been reading more and more about how the gut bacteria has on health.