PT - JOURNAL ARTICLE AU - Max J Schunemann AU - Martina Bertschinger AU - Christian Trachsel AU - Esther Bachli TI - Severe refeeding syndrome after human chorionic gonadotropin diet: a potentially lethal complication AID - 10.1136/bcr-2021-244011 DP - 2021 Nov 01 TA - BMJ Case Reports PG - e244011 VI - 14 IP - 11 4099 - http://casereports.bmj.com/content/14/11/e244011.short 4100 - http://casereports.bmj.com/content/14/11/e244011.full SO - BMJ Case Reports2021 Nov 01; 14 AB - We present the case of a young male patient who presented with paralysing muscle weakness due to severe hypokalaemia and hypophosphataemia. The initial patient history evaluations could not establish the aetiology. Only after we reviewed the patient’s history did he reveal that he had been following a severe calorie-restricted regime, the human chorionic gonadotropin diet, which had ended 2 days prior to developing symptoms. This information then allowed us to diagnose severe refeeding syndrome. As a further complication, the patient developed rhabdomyolysis. After correction of serum electrolytes, symptoms resolved completely. This case emphasises the potential harm of severely calorie-restricted diets, often recommended by online ‘experts’. Furthermore, we underline the importance of thorough history taking.