This story was first published on February 22nd, 2011
Outline
Circulating health warning claims that raw or leftover onions are poisonous because they are magnets for bacteria and are therefore not safe to eat.
Brief Analysis
The claims in the message are false. The claim that onions are “magnets” for bacteria has no scientific validity. Correctly handled and stored raw or left-over onions are no more inherently unsafe to eat than other types of food.
Examples
Please remember it is dangerous to cut onions and try to use it to cook the next day. 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.
Original Source : https://www.hoax-slayer.com/onions-magnet-bacteria.shtml