2. Familiarization Visit: Volunteers and parents will be invited to volunteers' first visit at the location of volunteers' choice (Nutritional Psychology Unit at the University of Reading or volunteers' school) where participants will receive a detailed explanation of the study by the participating research associate and will be asked to sign the informed consent form before any study procedure starts. A log will be kept identifying all participants having signed the informed consent form (ICF) and the participant will be allocated a participant number. Once consent has been given, the participants will then be asked to complete the EPIC Food Frequency Questionnaire so that background flavonoid intakes can be measured prior to the start of the intervention, Rumination Response Scale (RRS) and a General health questionnaire. Participants intelligence quotient (IQ) will be assessed using The Wechsler Abbreviated Scale of Intelligence (WASIII). Parents will also be asked to complete questionnaires, regarding children mood and behaviors, including the Parent version of MFQ, RCADS and attention deficit hyperactivity disorder (ADHD) Rating Scale-IV. Finally, participants will be given training on the cognitive test battery (tasks outlined below) that will be used during the study to reduce the chances of 'practice' adversely affecting performance on subsequent test days.