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This type of onion can be especially harmful for people suffering from asthma. Therefore, it is better to eat one or two layers of onion. Some studies have also shown that this fungus can cause problems like headache, nausea, stomach ache, diarrhea etc. One should also avoid keeping onions in the fridge. (Disclaimer: The information given in this article has been taken from different sources on the internet. News18 Hindi does not confirm it. For detailed information, seek expert advice.)