The purpose of this article is to reveal the social differentiations in the nutrition of social groups. The objectives are to analyze the daily nutritional practices of various social groups; show differences in nutrition and health of low and high income social groups. The research methods are telephone surveys of the population of St. Petersburg and the Leningrad region; in-depth interviews; analysis of statistical data (diets). The hypothesis of the study is based on the assumption that the rich spend more money and buy more food, than low-income fellow citizens, but the quality of foodstuffs is the same as that of low-income fellow citizens, as evidenced by the low health indicators of this social group. At the same time, the role of the factor of culture and education is much more significant in the formation of a healthy diet. Our studies have confirmed the hypothesis. The rich spend twice as much on food as the poorest, but at the same time they eat more bread, sugar and confectionery, sausages and potatoes, the structure of their diet does not change in favor of a healthy and proper diet. Also, rich fellow citizens are not able to overcome unhealthy eating habits.