The aim of the paper is to express the nature and the extent of changes in the consumer preferences in the context of the oligopolistic multinational chains of fast food restaurants. The methodology of the paper is based on the analysis of growing market shares of fast food restaurants in the Czech Republic using the performance indicators of companies. Among the largest fast food restaurants in the Czech Republic are McDonald’s, KFC, Subway and the new fast food chain Parky’s. McDonald’s market share in terms of output is currently 46% of the fast food market. The paper therefore analyzes the last part of the agri-food vertical with clear consequence on the demand for agricultural commodities and for food as a whole. This study is supported by the Internal Grant Agency of Faculty of Economics and Management, Czech University of Life Sciences Prague (Projects No. 20141025 – The growing share of fast food restaurants in consumer demand).