<qa>  What is the effect of active excitatory tDCS over left prefrontal cortexTherefore, the investigators hypothesized that active excitatory tDCS over left prefrontal cortex PFC Anode leftcathode right may aid in alteringresetting inter-hemispheric balance in AN patients, re-establish control over eating behaviors. On the contrary, active excitatory tDCS over right PFC Anode rightcathode left may aid in alteringresetting inter-hemispheric balance in BED patients and people with frequent food cravings, decreasing cravingsappetite binge eating behaviors. 