3. Phase 3 - tDCS plus hypocaloric diet (two weeks). During this phase participants will undergo a hypocaloric diet intervention aimed at achieving a 5% body weight reduction at 3 months. The diet will be individualized on the basis of physical activity levels, age for each participant. This intervention will be be conducted at an inpatient, well-controlled setting to guarantee adherence to the diet. Here the diet intervention will be administered in combination with tDCS. tDCS will be applied every other day (Monday, Wednesday, Friday) over the course of these two weeks. The purpose of this component is to examine acute changes in weight associated with tDCS in combination with the diet. Also analyse changes in appetite and eating behavior.