"I hate your guts"

Yeah, well they might hate you right back.

Our guts are the metronome that paces our circadian rhythms.

More research on how our own, personal zoo, the one between our lips and rectum varies throughout the day and night and how it interacts with the rest of "you".

This makes sense.

For example

After fasting for 10 hours we wake up and prep the system with a tonic of tannic acid, partially pyrolyzed oligosaccharides, caffeine and a tiny bit of lactose.  The components that stay soluble and are less reactive race down the gut toward the large bowel.  The caffeine is quickly absorbed and stimulates intestinal motility.

An image of one type of hemicellulose.  Image from HERE

That is followed by a great, big, whacking slug of polymerized glucose rings.  Some are highly soluble.  Some are not soluble but are short enough for my digestive enzymes to cleave.  Other are cellulose and hemicellulose.  Throw in a bit of pectin and anthocyanin,  then pour about 360ml of lactose solution into the bowl.

It is getting a little bit crowded in the reaction vessel.  Decant a slug of the old, mostly spent material.  It served its purpose and there is plenty left in there to be the "sour dough" starter for the next go-around.

...and so the clock is reset.

Every day is a great, swirling, riotous epic.  Each set of players have their moments of triumph when they are relatively competitive.  Each set of players have periods of decline when conditions favor others. Each set of players communicates with each other, with its competitors and with its host...that would be us.

Zoo or farm?
It might be more accurate to think of our personal microbiome as a farm rather than as a zoo.

Zoos provide entertainment.  Granted, being able to fart on command can be entertaining...but there is more to our microbiome than entertainment.

Farms nourish us and agriculture life can pace our lives.

Take care of the farm.