Intervention and Follow-up: For the yoghurt group, the intervention would be supplied in a disposable 80 g cup. Computer labels will be generated on a daily basis with identification information and the allocated code printed on it for all the enrolled children in the database and the appropriate yoghurt cups will be labeled for each child. The labeled yoghurt cups will be then handed over to the school supervisor to deliver to the student in his/her supervision during lunch break of the school. Children will receive the intervention for a period of 12 months. Children from the matched control in the non-yoghurt area will not receive any intervention.