The Idiot Brain: A Neuroscientist Explains What Your Head is Really Up To

by Dean Burnett

You may be a big fan of something like, say, cake. You can be eating cake for years without any bother, then one day you eat some cake that makes you sick. Could be some of the cream in it has gone sour; it might contain an ingredient you’re allergic to; or (and here’s the annoying one) it could be that something else entirely made you sick shortly after eating cake. But, from then on, your brain has made the connection and considers cake out of bounds; if you even look at it again it can trigger the nausea response.

This happened to me several times !