The aim of the thesis is to analyze supply and demand for healthy food in restaurants of two Czech cities, Praha and Ostrava. In the thesis there are defined basic terms related to food establishment and healthy food as a part of healthy lifestyle. There is introduced Czech gastronomy and its history. Diploma thesis also refers to typical Czech habits and frequent eating mistakes from healthy nutrition point of view. The research is focused on analysis of selected Czech restaurants' offer. There is included an interview with nutritional consultant and a survey, which is concentrated on demand for healthy food in Czech restaurants. Last chapter is devoted to final overview of the issue as well as to the suggestions for improvements.