The wiki article on "bran" offers the best explanation for me.

Take a long hard look at the "Nutritional Value" picture.

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http://en.wikipedia.org/wiki/Bran -7grizzly- 给 7grizzly 发送悄悄话 7grizzly 的博客首页 (0 bytes) () 08/15/2014 postreply 11:57:12

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