BBC Four TV took us on a different voyage with Guts: The Strange And Mysterious World Of The Human Stomach.
It's not just digestion going on down there. There's a second brain at work. The nine metres or so of the alimentary canal is studded with hundreds of millions of neurons.
As the BBC put it: "The little brain in our innards, in connection with the big one in our skulls, partly determines our mental state." More scientifically, the enteric nervous system does not just collect information and pass it upstairs. It integrates the data and acts on it.
The gut feelings from my own neurotransmitters include such messages as: Hey, haven't had a beer recently. Is there a strike at the brewery? You guys do remember that a glass of Chateau d'Yquem is an excellent digestif?
My second brain also sends reminders of the healthy side-effects of turmeric, from alleviating arthritis to Alzheimer's. The specific instruction is: send down a curry soonest.
I really must listen more when the intestinal brain says: no processed food, more organic products please.
The stomach sends a vast amount of information upwards to the cerebellum. It is likely that there is some brain function in a downwards direction and many people think out of the backside. Just a theory.
If the stomach has a brain, it's likely other parts of the body have one as well. It will be my liver brain saying no, don't have that beer or glass of Chateau d'Yquem.
There may be a brain in the region just below the stomach but it seems incapable of rational thought.
Footballers' brains are in their feet. Apart, that is, from the Liverpool player who was told by his boss Bill Shankly: "The trouble with you, son, is all your brains are in your head."
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