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Plain English summary Anorexia nervosa is a serious illness that is difficult to treat. New treatments are urgently needed. This paper describes a preliminary study of a potential new treatment for Anorexia Nervosa, transcranial magnetic stimulation. In this treatment a magnetic field is generated and applied from outside the skull to affect specific areas of the brain thought to be involved in Anorexia nervosa. The results of this preliminary trial, conducted with 19 subjects over 6 weeks, showed some improvements in the way people with Anorexia nervosa think about weight, shape and their eating. The benefits were associated with areas of the brain involved in decision making and in regulating emotions. These changes did not appear to be related to improvements in other conditions, such as depression.