Nutritional yeast - excitotoxin? - VeggieBoards
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#1 Old 04-10-2012, 09:30 AM
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Is this true?
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#2 Old 04-10-2012, 11:40 AM
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http://en.wikipedia.org/wiki/Nutriti...#Glutamic_acid

Quote:
Nutritional yeast products do not have any added monosodium glutamate; however, all inactive yeast contains a certain amount of free glutamic acid because when the yeast cells are killed the protein that comprises the cell walls begins to degrade, breaking down into the amino acids that originally formed it. Glutamic acid is a naturally occurring amino acid in all yeast cells, as well as in many vegetables, fungi and meats. High-temperature nutritional yeast products apparently yield elevated concentrations of the excitotoxin glutamate as a by-product.[citation needed]

Other than this mention I can't find anything about it from a website I would consider being a reliable source of information, though even on Wiki there aren't really any sources, so it's also not completely reliable.

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#3 Old 06-10-2012, 07:18 AM
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I've removed that bit from the Wikipedia entry now, on the grounds that it read like uncited scaremongering. It's quite possible free glutamate is indeed produced by high-temperature processing, but I couldn't find a half-way reliable citation for that either, and anyway calling glutamate an excitotoxin without any elaboration is decidedly misleading...

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