When it flips into orthorexia, the new obsession with 'clean eating' that has experts concerned.
How can you tell if someone's vegan? Don't worry - they'll tell you! If you don't get this joke, try replacing the word 'vegan' with 'paleo', 'organic only' or 'sugar free' and see if it describes anyone you know. Still not ringing true? Log into Facebook, Pinterest or Instagram and count how many green smoothie pictures - most likely accompanied by that smug hashtag #fitspiration - appear.
This article is published with permission of NEXT magazine. Issue: October 2014.