Constipation affects up to 20 percent of adults, but the culprit is rarely
a broken digestive tract. It usually happens when the colon does its job
a little too well.
When food waste enters the large intestine, it is mostly liquid. The
colon's primary function is water absorption. As rhythmic muscle
contractions - peristalsis - push this waste toward the rectum, the colon draws water out, turning the material into a solid mass.
If the waste moves too slowly, the colon absorbs too much water, leaving behind hard, dry stools that are difficult to pass.
This slowdown typically stems from four major factors:
Dietary Deficits
A lack of dietary fiber and fluid is the most common cause. Fiber provides
the physical scaffolding for a healthy bowel movement. Soluble fiber, found
in oats and apples, absorbs water to form a gel that softens the stool. Insoluble fiber, found in whole grains and leafy greens, adds bulk. This
bulk physically stretches the colon walls, stimulating them to contract
and push waste forward. Without enough fiber and water, the colon lacks
the traction it needs.
Ignoring the Urge
The human body relies on a highly coordinated reflex to signal when a
bowel movement is necessary. Stool entering the rectum stretches the
walls and triggers nerve sensors. When a person repeatedly ignores this
urge due to a busy schedule or avoiding public restrooms - the rectum accommodates the volume and stretches out. Over time, this blunts the sensitivity of the nerve receptors. The urge to go fades, and the stool
sits in the colon longer, drying out further.
A Sedentary Lifestyle
The digestive tract relies on full-body physical movement to stimulate
gut motility. Physical activity decreases the time it takes for food to move through the large intestine. A sedentary routine, such as sitting at a desk all day or prolonged bed rest, reduces the natural muscle contractions in
the bowel, stalling the transit of waste.
Medications and Medical Conditions
Constipation is a frequent side effect of chemical interventions. Opioid painkillers slow down the central nervous system's signals to the gut. Iron supplements, calcium-channel blockers for blood pressure, and
aluminum-based antacids can also severely dry out stool. Additionally, underlying physiological issues˙such as hypothyroidism slowing overall metabolism, or pelvic floor dysfunction preventing the muscles from coordinating during a bowel movement˙can halt the process entirely.
Full story:
https://www.quora.com/Why-do-some-people-suffer-from-constipation
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* Origin: The Hobbhy Line! BBS (999:1/1)