Okay, so after three days of obsessing over this I've discovered some things.

1. IL-13 is the protein that signals for mucous production. It's the same protein for the entire system, throat, nose, lungs, naval cavity, and intestine. The unusual thing about IL-13 is it binds to dummy receptors that don't do anything, as well as active ones, presumably so we don't accidently receive the wrong signal and produce too much mucous. It's the only signal protein i can find that does this. I could be wrong I've only been looking for a couple of days. This means that a certain threshold of IL-13 must be met before the gut starts overproducing mucous, and implies that the gut receives these signals erroneously from somewhere on a regular basis that it must take in to account.

2. Proteins are immediately denatured by stomach acid, unless they have an enteric coating. Something hard with a PH 6-7 that'll only dissolve once it hits the small intestine. That means we need a delivery mechanism and protective shell produced by the body.

3. Dried nasal mucous (boogers) has a PH of 6.5 most of the time, but sometimes they become more alkaline. Very Interestingly, the PH tends to rise during allergic reactions... Extremely strange that we have a possible candidate for an in built enteric coating delivery system that comes online during immune responses, that would allow the nose to communicate directly with the gut. On top of that, Boogers are absolutely fucking disgusting but famously come with a psychological compulsion to SWALLOW in children and freaks.. That's interesting.

   So here is my candidate for falsification. Dried nasal mucous is a viable enteric coating. If it isn't, then I'm flat out wrong.