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Jennifer Petersen has just posted a long summary of adding fiber to one's
diet. Many of the excerpted responses recommended adding bran to one's
diet. If one is concerned about absorbing minerals, then this is the worst
food one can eat. Bran (and whole grains containing bran) contain phytic
acid which strongly binds to minerals like calcium, iron, zinc and
magnesium to form insoluble salts, phytates, which then precipitate from
the body. This would affect the minerals consumed in the same meal as bran.
If one cares about these minerals, and celiacs should, then one should not
be eating bran. I have 60 references on this. This article by Staffan
Lindeberg uses 29 of them as footnotes:

  http://maelstrom.stjohns.edu/CGI/wa.exe?A2=ind9706&L=paleodiet&P=850

Don.