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Botulinum Toxin

I asked on the cooking site, but was directed here. This is my original question http://cooking.stackexchange.com/questions/35726/botulinum-toxin-in-home-canned-green-beans The reading is quite ...
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What Defines a Food as Edible?

With many foods today containing chemicals, agents and preservatives etc... What biological criteria must a new food and its constituent components satisfy biologically, to be defined as edible? ...