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You must be kidding me. There is not a single food, vitamin, or supplement on the planet that someone can't prove it's very healthy and someone else prove it's very unhealthy. Not eating anything is very unhealthy too. By the way, many of the health gurus that push extreme diets tend to not live very long.
Fiber Menace: The Truth About the Leading Role of Fiber in Diet Failure, Constipation, Hemorrhoids, Irritable Bowel Syndrome, Ulcerative Colitis, Crohn's Disease, and Colon Cancer