This article previously described a chain — undigested protein feeding bad bacteria and generating toxic gases — as established fact, and cited the wrong study for one point. It was partly rewritten in August 2026. The putrefaction process described below is not something the studies this site cites have tested.
“Gut activity,” involving the daily intake of yogurt, fermented foods, and soluble dietary fiber for purposes like “boosting immunity” or “increasing skinny bacteria,” is booming. However, there is no end to the number of people whose bowel movements do not improve at all, or whose bloating does not subside, despite eating expensive probiotic products every day.
Why is your gut activity failing? The biggest blind spot lies in completely ignoring the “first digestive process of chewing” in the mouth.
It is the “barrier” that absolutely must be cleared before delivering food to the intestinal bacteria. That is the “physical crushing of the food bolus” by the jaw muscles.
The Tragedy of Swallowing Whole: Intestinal Putrefaction Invited by “Undigested Protein”
The human digestive tract is not a single pipe. It is an intricate conveyor belt where perfect handovers take place: “Mouth (physical crushing and initial digestion)” -> “Stomach (sterilization and protein degradation by acid)” -> “Small Intestine (nutrient absorption)” -> “Large Intestine (fermentation by intestinal bacteria and water absorption).”
Here, if the first workers, “the teeth and jaw (chewing),” slack off and swallow the food as large chunks (without chewing well), the stomach and intestines that take over fall into a panic.
- Overwork of the Stomach: Meat and carbohydrates that fall down as chunks cannot be completely dissolved to the core by gastric juice alone. This point previously cited E05 for an “impairment of the digestive secretion process.” E05 is a crossover trial comparing whole walnuts with walnut paste; it did not measure gastric digestion.
- Malabsorption in the Small Intestine: Food that hasn’t turned into a sludgy liquid cannot be smoothly absorbed as nutrients in the small intestine.
- Progression of “Putrefaction” in the Large Intestine: This is the most serious part. The “chunks of undigested protein and lipid” that escaped digestion and absorption in the small intestine flow straight into the large intestine. Good bacteria residing in the large intestine (like Bifidobacteria) cannot use these as food, but bad bacteria (like Clostridium perfringens) devour the undigested protein as their favorite food, generating large amounts of toxic gases like ammonia and hydrogen sulfide.
This is the fundamental reason why your stomach condition does not improve (your intestinal environment remains troubled) no matter how much yogurt you eat.
2 Reasons Why Chewing is the “Best Gut Activity”
If you want to regulate your intestinal environment, before buying expensive supplements, first start by “biting to death” every mouthful of food until it becomes completely liquid (paste-like).
1. Generation of Physical “Prebiotics”
By chewing dozens of times in the mouth, the cell walls of vegetables and the like are physically destroyed, releasing the nutrients and water trapped inside. Furthermore, the sludgy, paste-like food (a proper bolus) is processed smoothly in the stomach and small intestine, and only the “digested residue (like dietary fiber)” that good bacteria rejoice over, rather than “food for bad bacteria (undigested matter),” is accurately delivered to the large intestine.
2. What the Trials Found About GLP-1
Chewing more has been reported to raise GLP-1. E17 (thirty chews per bite) found significantly higher active GLP-1 at 30 minutes, and E19 (gum chewing) also found significantly higher values.
This passage previously cited E14 as the source for that. E14 is a systematic review of chewing and obesity; it covers neither GLP-1 nor intestinal motility.
And no study cited on this site measured whether GLP-1 “controls peristalsis at an appropriate pace” or prevents constipation and diarrhoea. That is outside what we can write.
What This Article Has Not Established
- That chewing changes the balance of the gut microbiota — E06, a systematic review, reports that reduced chewing function may be associated with microbiota changes, but it is not an intervention trial that varied chewing count and measured the microbiota
- That chewing changes the quality of the residue reaching the large intestine — no study measuring that is cited
- That constipation or diarrhoea can be prevented — same
Alongside “what you eat,” “how you chew” is worth looking at. But what can be said today stops at reported associations; we have not identified a trial showing that changing how you chew changes the gut environment.
Chew Better, Live Better.
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