In short, fiber. Rather than “sit” in your intestines where it will be absorbed, increased fiber helps “mop up” the cholesterol and carries it out in your stool. Imagine an oil spill in your pipes. If you send solid, hard material through, it won’t carry much oil out the other end. If you send a sponge-like material through, it will “clean out” the oil better by absorbing it and carrying it out the other end. Probably way over simplified but that’s my understanding.
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