To inform WFP, Cambodian policy and the public on the potential benefits of fortified rice on health and development for Cambodian school children, an intervention study will be conducted in Kampung Speu province during the 2012 - 2013 school year. The study will be conducted by IRD, PATH and WFP. Sixteen (16) schools will be selected to receive either the normal rice provided by the WFP school meal program, or fortified rice instead of normal rice. Three (3) different types of fortified rice will be tested, to identify the best type of fortified rice. In addition, 4 schools with no school meal program will be selected to serve as control. School attendance and morbidity will be followed in all children in the participating schools over the whole school year. Biochemical indicators of micronutrient status will be determined in a subgroup of children (25% of the children), which requires collection of blood, urine and stool samples.