Poor treatment outcomes are available for anorexia nervosa (AN) and treatment innovations are urgently needed. Recently, non-invasive neuromodulation tools have suggested to have potential for reducing an symptomatology targeting brain alterations. The objective of the study was to verify whether left anodal/right cathodal prefrontal cortex transcranial direct current stimulation (tDCS), may aid in altering/resetting inter-hemispheric balance in patients with AN, re-establishing control over eating behaviors. Twenty-three adolescents with an underwent a treatment as usual (AU), including nutritional, pharmacological, and psychoeducational treatment, plus 18 sessions of tDCS (TDCS+AU = n11; mean age = 13.9, SD = 1.8 years) or a family based therapy (FBT+AU = n12, mean age = 15.1, SD = 1.5 years). Psychopathological scales and the body mass index (BMI) were assessed before and after treatment. After 6 weeks of treatment, the BMI values increased only in the tDCS group, even at 1-month follow-up. Independently of the treatment, all participants improved in several psychopathological measures, included AN psychopathology and mood and anxiety symptoms. Our results demonstrated for the first time a specific effect of the left anodal/right cathodal tDCS treatment protocol on stable weight gain and a superiority compared to an active control treatment for adolescents with AN. Results were interpreted as a possible direct/indirect effect of tDCS in into some pathophysiological mechanisms of AN, involving the mesocortical dopaminergic pathways and the promotion of food intake. This pilot study opens new perspectives in the treatment of an in adolescence, supporting the targeted and beneficial effects of a brain-based treatment.

IntroductionAnorexia nervosa (AN) is characterized eating behaviors and body image disturbances. Given poor treatment outcomes are available for AN, treatment innovations are urgently needed. Recently, non-invasive neuromodulation tools have suggested having potential for reducing AN symptomatology targeting brain alterations.ObjectivesThe objective was to verify whether an excitatory transcranial direct current stimulation (tDCS) over the left prefrontal cortex may aid in altering/resetting inter-hemispheric balance in AN patients, re-establishing control over eating behaviors.AimsResearch is aimed to evaluate the potential of tDCS treatment in determining a more rapid improvement compared to classical treatments in adolescents with AN.MethodsTwenty-two adolescents with AN, underwent the treatment as usual (AU) plus the tDCS treatment (TDCS + AU: n = 8, age M 13.7 ± 1.9 years) or a family therapy (FT + AU: n = 14, age M 15.1 ± 1.75 years), for six weeks. Psychopathological scales (EDI-III, EAT 26, BUT, MASC, CDI) and anthropometric indicator of nutritional status (BMI) were assessed before and after treatment.ResultsBMI improved only in the TDCS + AU group (P < 0.01). Mean BMI percentage of improvement was 14.43% + 10.8 in the TDCS + AU and 4.83% ± 5.4 in the FT + AU. Both groups improved in the total scores of the EDI, EAT-26, MASC and CDI scales (all P < 0.01).ConclusionstDCS treatment improved BMI values more than classical treatment and determined comparable to the classical treatment improvement in the psychopathological scales. This results may be an important starting point to further explore the beneficial effect of brain based treatments for AN.Disclosure of interestThe authors have not supplied their declaration of competing interest.