The topic of this graduate thesis is the use of proper nutrition in preschool children. The first part of the work describes needful ingredients of food for the functioning of the body: proteins, carbohydrates, fats, vitamins (A, B, C, D, E and K), minerals and water. Children nutrition needs to be rich and varied, which means consuming fruits and vegetables, cereals, red and white meat, fish and dairy products. The proper diet pyramid contains the ratio and amount of daily food intake. The paper describes nutritional needs and recommends nutrition for child from birth to seven years of age. Nutrition in kindergartens in the Republic of Croatia is prescribed by the Ministry of Health and is conducted according to the "Health care program for children, their hygiene and proper diet for children in a pediatric". The program implements modern standards for nutrition planning and continues to encourage children to adopt positive nutrition habits from the earliest age. Furthermore, if the child is hypersensitive or allergic to some food ingredients, even greater importance should be given to diet, and advice is given to parents whose children have reaction of the defense system to the food ingredients. Finally, the biggest problem of modern, sedentary lifestyle is mentioned, which is obesity. The causes of obesity and prevention methods are described such as proper nutrition, physical activity, and parents support for child. In order to give a complete picture of the use of proper nutrition, research has been carried out to find out if a proper nutrition is being done in kindergartens. Overall, the survey results indicate incomplete implementation of proper nutrition. The creators of the food menu in kindergartens do not fully comply with the guidelines issued by the Ministry of Health in the aforementioned program.