Anorexia, DNA, and false distinctions

‘Advances in prevention and treatment will come through greater understanding of how both mind and body interact to cause a mental illness.’ Photograph: Rex ShutterstockWhile it’s welcome news that researchers have found that certain metabolic genes are linked to anorexia nervosa (Anorexia ‘not solely a psychiatric problem’, 16 July), I suggest that Gerome Breen and colleagues have made a conceptual error in suggesting that this means the condition is not psychiatri