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10 extremely unusual allergies

Feb. 21, 2011, 4:47 p.m.
chocolate

Photo: Tasumi1968/Flickr

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Chocolate

Some people couldn't live without chocolate, but others can't live with it. Rare as the condition is, chocolate can trigger an allergic reaction, including headaches, hives or difficulty breathing. Because chocolate is made up of a variety of ingredients, it's not always the cocoa that's to blame — milk, nut traces and soy lecithin can also be triggers.