A 39-year-old woman with severe anorexia nervosa, complicated with a low ejection fraction of 10-20%, developed refeeding syndrome, massive oedema, and acute cardiac failure, but recovered during specialised nutritive treatment and inotropic medication with levosimendan. With this case report, we aim to draw attention to the refeeding syndrome and to the cardiological consequences of anorexia nervosa. Takotsubo cardiomyopathy is reversible if the proper treatment is given.