Rapid intestinal transit time may explain why it takes you so little time between eating and defecation.
Intestinal transit time refers to the amount of time for food to move from the stomach to the anus after it has been broken down in gastrointestinal tract. If food passes too quickly, inadequate nutrient absorption occurs.
The time needed for food to pass through the gastrointestinal tract depends on a number of factors. Normally, it should take 2.5-3 hours for 50% of stomach contents to empty into the intestines, and 4-5 hours for the stomach to empty completely. A 50% emptying of the small intestine lasts an additional 2.5-3 hours; lastly, transit through the colon takes 16-40 hours. A diet rich on fibers helps transit times.
Other things that decrease the amount of time that stool stays in the intestines:
surgical bypass of part of the intestine
prostaglandins
serotonin
acidic foods
stress and anxiety are also common causes
Zollinger-Ellison syndrome (over-production of acid due to a tumor).
Rapid intestinal transit is suspected when stool color is greenish (from bile) , meaning that the final stages of digestion have not had time to take place (of note that there is no "normal" stool color because it varies from person to person and depends on what was consumed and the digestive process).
Another sign of Rapid Intestinal Transit is chronic diarrhea (lasts for 1-3 months); stools are watery because they don't stay enough time in the colon for the water to get absorbed.
Risk factors for Rapid Intestinal Transit:
Hormones
Hyperthyroidism (increased thyroid hormone)
Stress and anxiety
Supplements and medication
Antacids containing magnesium
Laxatives used regularly
Excess coffee consumption
Having had a small bowel resection: food passes through the intestine too rapidly due to reduced length, so there's not enough time for proper digestion and absorption to be completed
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