6.4 Colonic Propulsion

Colonic propulsion determines how long stool remains in the colon and therefore how much water can be recovered before output.

Slower propulsion can increase water recovery and stool hardness. Faster propulsion can reduce water recovery and loosen stool.

Not every stool issue is primary motility disease. Clinical motility disease belongs to the clinical boundary layer. Feline FBM backtraces propulsion to upstream food structure and water-handling variables.

Output variable linking propulsion to constipation and loose stool.

Water entering the colon from upstream segments.

Secretion-opposed to recovery depending on regulation state.

Later-segment regulatory input from fat handling.

upstream food structure

↓

water recovery and colonic regulation variables

↓

colonic propulsion

↓

stool water content

↓

constipation index or loose stool index

Constipation index and loose stool index are observable outputs—not root causes and not default motility disease labels.