Here's a link to an excellent discussion on food preservatives, including why they are used, where they are used, and related health risks for sensitive individuals.
http://chemistry.about.com/gi/dynamic/o ... /formj.htm
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Preservatives In Food Cause Health Problems For Many Of Us
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Preservatives In Food Cause Health Problems For Many Of Us
It is suspected that some of the hardest material known to science can be found in the skulls of GI specialists who insist that diet has nothing to do with the treatment of microscopic colitis.