The consistencies for the bowel movements depends on the speed of the peristalsis
(the rate of speed that food is pushed through the bowel system). If a person has diarrhea, the food will move very quickly therefore causing less for the food and nutrients to be removed. So that will cause the stool to be very liquid.
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You could have a pencil thin bowel movement if you have colon problems. There is something restrictive in your colon or anus.