Ask around and you'll find that loud munching is one of the most reviled eating habits of all. For people with a condition called misophonia – a phobia of repetitive noises – it can be anxiety-inducing, producing a reaction akin to the 'fight or flight' response. So be polite, close your mouth and try to eat as quietly as you can.

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Last updated by Luke Paton.

Bad eating habits you probably don't even know you have