Nutritional education intervention The dietary intervention, designed by the nutritionist staff, consisted of two actions. The first was trough monthly events throughout the intervention, one in the beginning of each month, with participation of participants' parents. The second action consisted on the achievement of 3 dietary goals (an easy, an average and hard goal) to which children and adolescents should meet during the months of intervention. These goals were added during the intervention, so that the beginning of the 1st month of intervention participants had three goals to meet, and at the beginning of the 3rd month, 9 goals. They also received a worksheet to record if they met the minimum (1 star), average (2 stars) and maximum (3 stars) of the daily goal.