Background: The tsunami disaster in the Indian Ocean is one of the worst natural disasters in the modern times. The grief and worry created by the disaster has affected the health status of women and children. Malnutrition and ill health are major problems. This study investigated the nutritional status of the children and provided a nutrition education program for the mothers. Aims: To study the demographic profile, dietary habits, anthropometric measurements, clinical assessment, incident rates of infectious diseases among the 500 children. To assess the dietary intake of 100 malnourished children and to formulate ten low cost nutritionally balanced recipes and to provide nutrition education program for the mothers. Sample: 500 preschool children in the age group of 3-6 years of the tsunami affected Nagapattinam district were the samples of this study. Method: Interview schedule was administered to 500 mothers. Anthropometric measurements such as height, weight, mid arm circumference, head circumference and chest circumference were recorded by the investigator. Three day dietary recall method was used to assess the nutrient intake. Clinical assessment was conducted with the help of a doctor. Nutrition education was provided to the mothers with the help of posters and charts. Results: The results found that, majority of the children were under nourished and there was a significant difference between the mean nutrient intake and the recommended dietary allowance. Mean scores of nutritional knowledge and awareness significantly increased after the nutrition education program. Conclusion: Nutrition education must be provided to the mothers to improve the nutritional status of the children. The gained knowledge had to be put into practice.