This, I don't agree with. It's possible that it might cover some troubles, but 'digestive problems' might already be a cover name for a current chronic infection.
Recent research about gliding bacteria show that they can produce a chemical called capnine that can shut down the immune system, which then lets in more aggressive bugs than the gliding bacteria themselves.
Since the gliding bacteria were found when testing artifical joints that had been replaced, the 'digestive problems' are likely at most one of several paths for likely infection. If adding stomach acid helps, then maybe the original problem was an infection that tended to reduce stomach acid levels.
Or.....maybe the problem is some docs tend to over-prescribe things like Pepcid AC, Zantac and other "antacids". We've got a whole generation of people who have been sold on remedies to mask symptoms.... instead of being encouraged to find underlying causes.
The problem is in many cases, that various injuries can interrupt the function of the nervous system, and in particular, the sensation in the stomach that “turns on” the flow of acid. When this happens, any and all types of bacteria have an open door to the blood through the intestines, and can bring on problems like arthritus, bronchial congestion, type II diabetes, cognitive disorders caused by infection of the substantia negra, or other parts of the concavity of the brain, or of the basal ganglia, which can cause massive neurological disfunction anywhere in the body.
Digestion is the gateway of the immune system.