Search #cleaneating on social media, and you'll come across over 50 million posts. Vegan, paleo, raw, protein shakes, juice cleanses, gluten-free, dairy-free, chia seeds… all of these things, social media and diet culture will tell us, are the types of foods we should be putting into our bodies.    These diets offer the promise of perfect health and the perfect body…But for some they tip over into unhealthy obsession.   Yumi Stynes discovers what happens when food choices stop being about "yuk" and "yum" and become a battle between good and evil. When clean eating tips over the wafer-thin line into Orthorexia Nervosa.    Featured in this episode: Dr Gemma Sharp, Clinical Psychologist and Head of Body Image research at Monash University