Some dietary fiber is insoluble, it just doesn't break down very well. Examples are things like the skin of tomatoes, some types of lettuce, etc. People with normal GI tracks will on occasion be able to bee food particles. Food particles are of course harder to recognize when the stool is formed. Larger particles can come from lack of sufficient chewing or a too rapid transit time. People with malabsorption problems or too rapid transit times will see more food fragments and/or larger peieces. My transit time was 6 hours at one point [normal 18-36 hours]. I would see large recognizable pieces of mushrooms, carrots, and other fruits and vegetables.
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