This study was carried out to examine the effects of nutrition on pupils’ performance in selected primary schools in Muhororo Sub County, Kagadi District. The study objectives were; to establish the effects of nutrition on the academic performance of pupils in selected primary schools in Muhororo Sub County, Kagadi district, to find out the relationships between nutrition and brain function of pupils in selected primary schools in Muhororo Sub County, Kagadi district and to suggest measures that can be taken to solve the problem of poor nutrition in primary schools. A cross sectional survey design using both quantitative and qualitative methods were used to collect data. The qualitative study design investigated the effects of nutrition on pupils’ performance between the independent
and the dependent variables. The sample was drawn from selected primary schools in Muhororo Sub County, Kagadi District. Data on nutrition and academic performances were gathered using a questionnaire. Structured interview guides were used to collect views from the non-pupils. Data from questionnaires were analyzed using both descriptive and inferential statistics and interviewed data was analyzed using frequency analysis by counting the number of times of responses had by the respondents. From the study, conclusions were drawn and recommendations as well.