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Effect of coffee on distal colon function.

S R Brown1, P A Cann, N W Read

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Summary
This summary is machine-generated.

Coffee consumption can stimulate bowel movements in some individuals. Studies show coffee significantly increases colonic activity in those who experience this effect, unlike hot water.

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Area of Science:

  • Gastroenterology
  • Physiology

Background:

  • Coffee is a widely consumed beverage with various physiological effects.
  • Anecdotal evidence suggests coffee can stimulate defecation, but the underlying mechanisms are not fully understood.

Purpose of the Study:

  • To investigate the effects of coffee consumption on rectosigmoid colonic motility in healthy individuals.
  • To determine if coffee, both regular and decaffeinated, elicits a measurable motor response in the distal colon.

Main Methods:

  • A questionnaire assessed bowel habits and coffee's effect on defecation in 99 healthy volunteers.
  • Rectosigmoid motor responses were measured using multiport manometry in 14 healthy subjects.
  • Subjects included self-reported "responders" and "non-responders" to coffee's laxative effect.

Main Results:

  • Twenty-nine percent of volunteers reported coffee induced a desire to defecate.
  • Coffee ingestion (regular and decaffeinated) significantly increased the rectosigmoid motility index within four minutes in responders (p < 0.05).
  • This increased motility persisted for at least 30 minutes and was not observed in non-responders or after hot water ingestion.

Conclusions:

  • Coffee consumption stimulates distal colon motor activity in a subset of healthy individuals.
  • Both regular and decaffeinated coffee can trigger this physiological response, suggesting a component beyond caffeine.
  • The findings provide objective evidence for coffee's pro-defecation effect on the colon.