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Norm, you mentioned lignin several times in “FTD IBS”. For instance, quoting from the 2013 book edition page 93 f.: “Insoluble fiber includes cellulose (beta-glucan), lignin and some hemicelluloses. Insoluble fiber is believed to increase bulk, soften stools and decrease gut transit time, potentially helping with constipation.” On page 97: “Lignin was not fermented at all.”