Introduction: Malnutrition remains a significant public health challenge, particularly in developing countries, where it adversely affects the growth, health, and academic performance of children. This study aims to assess the impact of malnutrition on the academic performance of school children at selected school, Tiruvallur district.Methods: The study used a cross-sectional design and selected a sample of 30 students through convenient sampling. Inclusion criteria included children enrolled in the selected school, aged 6 to 12 years, with parental or guardian consent for participation. Exclusion criteria were children with known chronic illnesses that could affect growth or academic performance, students absent during data collection, and those without parental or guardian consent.Results: Out of the students that were sampled, 26.7% reported mild malnutrition with 50% having a normal BMI. In addition, 16.7% of the students were determined to be moderately malnourished, and another 6.7% were severely malnourished. We found a significant negative correlation between malnutrition and academic performance, r = -0.55, with a moderate negative relationship. This implies that as malnutrition increases academic outcomes decrease as nutritional status has a significant impact on academic performance of students.Conclusions: The study concluded that a high prevalence of malnutrition among school children with 50% affected, and a moderate negative correlation (r = -0.55) between malnutrition and academic performance. The findings emphasize that addressing malnutrition is essential not only for health but also for improving educational outcomes
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