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  • 2020-02-28 (xsd:date)
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  • Pre-cut onions are not dangerous (fr)
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  • Cut onions promote the growth of bacteria and quickly become dangerous to eat. This is not true. Cut onions are safe to eat for about a week, if kept in the fridge. A post claiming that cut onions become dangerous to eat when left overnight is being widely shared on Facebook. This is an old myth, which has persisted in various forms for many years. According to the post, it is dangerous to cut an onion and try to use it to cook the next day because it becomes highly poisonous for even a single night and creates toxic bacteria which may cause adverse stomach infections because of excess bile secretions and even food poisoning. When the fact checking website Snopes looked at this claim in 2009, they found a possible origin in a blog written by Sarah McCann under the pen name Zola Gorgon. The blog describes a visit to a mayonnaise factory, where McCann was told that pre-cut onion was allegedly a common source of food poisoning. There appears to be no evidence for this, however. Snopes were able to find only one case of food-poisoning linked to bulb onions. A review of the available scientific research in January 2018 found evidence that onion volatile compounds released when cut may actually play a role as antimicrobials that reduce the rate of microbial growth. Overall, the review says that a shelf‐life of 10 to 14 d[ays] is normally feasible for fresh‐cut onion stored in a refrigerator. The National Onion Association in the US says onions can be stored safely in a sealed container in a refrigerator for up to seven days after they are cut. This article is part of our work fact checking potentially false pictures, videos and stories on Facebook. You can read more about this—and find out how to report Facebook content—here. For the purposes of that scheme, we’ve rated this claim as false because there is no evidence of pre-cut onions producing toxic bacteria after a day, and plentiful evidence that they can be kept in the fridge for about a week. (en)
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