Nutrition Day is an international professionally- scientific project aimed at improving the knowledge and awareness of the importance of proper nutrition in hospitals, initiated by the European Society for Clinical Nutrition and Metabolism (ESPEN). In November 15 and 16, 2018 CHC Zagreb participated in this project. The aim of this project is to raise awareness of the importance of proper nutrition for patients, as well as among medical staff, while the aim of this graduate thesis was to process the data collected during Nutrition Day 2018 at CHC Zagreb and compare them with the reference results collected in other countries. The implementation of the project and the completion of the questionnaire were organized and conducted by the staff of the Department of Clinical Nutrition and Nutritionists of the Nutrition and Dietetics Department, with the assistance of twenty volunteers, students of nutrition and medicine. The results showed a low number of employed dietitians and nutritionists, the presence of nutritional strategy and nutritional care, however, there was a lack of activity related to malnutrition screening. Body weight is most commonly measured at admission in hospital and almost never during 24, 48 or 72 hours. Also, weighing or just BMI data is most commonly used to evaluate and monitor malnutrition. CHC Zagreb strives to ensure that its patients have adequate energy intake.