Diet of school children, as one of the most vulnerable groups of the population, is of great importance. Balance, diversity and specific nutritional needs are the main characteristic of proper nutrition of school children. More and more children are involved in extracurricular activities and that may potentially have a negative impact on the quality of nutrition. The aim of the study is to examine the quality of nutrition of children from 5 to 8 grades and to compare the diet of elementary school pupils and those who, besides primary school, attend regular school of foreign languages. The survey included 80 respondents, 40 of them from elementary school and 40 from foreign language school. The method of collecting data is questionnaire which was used to examine nutritional and life habits of children as well as the impact of extracurricular activity on the quality of feeding. All the responses have been entered in Microsoft Excel 2010. After that, the specific statistical tests have been used to test the hypothesis. The results showed that there are no statistically significant differences in the diet of pupils going to primary school and those who also go to school of foreign language. The only exception that was statistically significant was the consumption of fish and sweets between these two groups. Body mass index of school children was largely in the line with recommendations. The conclusion is that additional researches are needed that would involve more respondents in order to have a better insight into the situation.