I have a question.

If Bad Breath was originating in the gut, intestine, colon due to food being putrified there, then during sleep, due to our reduced breathing, metabolic system, and circulation system, we should expel less of our bad breath.

But how do we explain the fact that we have really horrible breath when we wake up compared to any other time of the day?

Because its a conducive environment for anaerobic bacteria to thrive.

But if the cause of bad breath is due to blood carrying the vsc and mc and other odor producing compounds, then at night due to low rate of circulation and lower breathing rate, we'd produce less odors. But then does it mean, that as we wake up we produce a sudden peak of bodily functions?

I've read that during REM sleep we have similar breathing and heart rate.
But our metabolic system is still in semi - limbo so the osmosis of compounds from and to our blood, or whatever should be still lower so we shouldn't be producing that horrible breath first thing in the morning.

Or is It that we reintroduce ourselves to that smell in the morning?

Otherwise it has to be due anaerobic bacteria, which thrives in less oxygen environments and causing the horrible breath in the morning, and that means there is an imbalance of bacteria some part of our body which need to be corrected.

My point is that I don't think BB breath can originate in the gut area. It can be an indirect cause but not the main issue.

Is my reasoning right?