How does insoluble fiber in cucumbers promote bowel regularity?

By adding bulk to stool

The digestive support offered by cucumbers is significantly tied to their fiber content, which includes both soluble and insoluble types depending on the section consumed. Insoluble fiber functions mechanically within the gastrointestinal system, often described metaphorically as an 'internal broom.' Its primary mechanism is not to dissolve or become viscous, but rather to remain relatively intact as it passes through the large intestine. By adding physical bulk and volume to the fecal matter, it stimulates peristalsis and helps ensure that waste moves efficiently through the digestive tract, which is the crucial action required to promote regularity and actively work toward the prevention of constipation. This bulking action is synergistic with the high water content, ensuring smooth transit.