Following on from the previous posting about the gut -- our 'second brain', it is interesting to note that our gut is host to about 100 trillion microbial cells and about 1,000 microbial species. This is part of our microbiome -- the bacteria, viruses, fungi and other microorganisms that live on or in all of us. Whereas our bodies are shaped by just 23,000 genes, there are 8 million genes in the human microbiome (for more read 'Living in a Microbial World').

Recently it has been shown that it is possible to carry out a gut microbial transplant.

Maybe they will find the bacteria that are responsible for the 95% production of serotonin which occurs in the gut. I am awaiting the 'happy bug' transplant.