Redefining the functional roles of the gastrointestinal migrating motor complex and motilin in small bacterial overgrowth and hunger signaling.
Level 5 - mechanism / opinion, no new human data
Narrative review of physiological mechanisms without systematic search methodology
PubMed 26660537 · doi:10.1152/ajpgi.00212.2015
What was done
This minireview synthesized physiological and historical literature regarding the role of the gastrointestinal migrating motor complex (MMC) and motilin in small intestinal bacterial overgrowth and appetite regulation. No primary experimental protocol or systematic review search criteria were detailed in the abstract.
What was found
The abstract reports no quantitative data or statistical effect sizes. It describes that the MMC exhibits three fasting phases, with phase III being the most active (originating in either the stomach or small intestine). Motilin plasma levels fluctuate in coordination with MMC phases and trigger phase III contractions of gastric onset. These motilin-induced phase III contractions are associated with hunger signaling in healthy individuals and are reported to be disturbed in morbidly obese patients.
Why it matters
It highlights that the MMC functions beyond its traditional role as a gut "housekeeper" preventing bacterial overgrowth, acting additionally as a hormonal and mechanical driver of hunger signaling.
Limits
The abstract provides no sample sizes, numerical metrics, or systematic search details. Findings represent qualitative narrative synthesis of previously published mechanistic and observational studies without risk of bias assessment.
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- contradicts Between meals, a peristaltic cleansing wave moves through the colon, and eating stops this wave.