Hitting on the how does fiber affect the body part of the question. Fiber does two main things when you eat it, slowing digestion and cleaning your pipes.
If you were to eat a large amount of fiber and then eat some sugar (say a bunch of broccoli and then some skittles), the sugar from the skittles would enter your body slower than if you ate them on an empty stomach. Due to the slowing of digestion, you tend to stay fuller longer and feel less hungry shortly after eating. You know that “I just ate 30 minutes ago why am I starving” feeling? It’s because the meal lacked fiber and fats, which do similar things.
As for cleaning the pipes, there is soluble and insoluble fiber. Soluble fiber becomes a jelly like substance in your gut which helps the waste stick it and properly clump up to be released. Insoluble fiber acts like a rake in that stays fairly like it is and pushes stubborn waste material out of the system as its moved along. Both of these are required components of a healthy BM.
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