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Old 12-10-2011, 04:24 PM   #6 (permalink)
RunbikeSki
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Remember the difference between acute (basically a single dose) and chronic (long term exposure) doses.

Vito's post indicates that one needs to eat grams of Selenium for an acute exposure. A brazil nut has 544 micrograms (1 millionth of a gram) of selenium so you'd have to eat some where around 10 thousand brazil nuts to recieve an acute toxic dose.

Or, you could probably eat 1000 brazil nuts a day for many months to get a chronic exposure.

Selenium is water soluble so it does not generally get stored in the body. You eat a bunch of brazil nuts, blood concentrations are a bit elevated for a while, and then the excess is excreted.

So as long as you are not living on brazil nuts exclusively (or have some other underlying health issue) enjoying a few from time to time is pretty harmless.

Selenium does, however, have some environmental implications:

http://www.northtrinitylake.com/wate...mCaseStudy.pdf
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