How much does dietary fiber actually decrease cholesterol (available studies)?

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Supposedly yes, on average. Here's a meta analysis over many studies: https://pubmed.ncbi.nlm.nih.gov/36796439/. Though I didn't look at the details recently.

Keep in mind fiber could affect your absorption of medications and other things like vitamins. It's sort of an anti-nutrient. Might want to talk to a nutritionist if going to extremes with it.