An analysis of rate of changes of bioeconomical value of 50 selected food products, amount of energy and protein purchased in the products for 1 000 zlotys as well as food consumption structure in households at different income level in 1988-1991 was made. The conclusion indicated that relation of bioeconomical values of all food products have been changed but still the cheapest energy source were grain products and fats. The cheapest protein source were grain products, milk and milk products. Average depreciation of bioeconomical value during investigated period of time varied from Tsr=-58.2% to Tsr=—79,8%. Portion of household expenses for food in all groups of households was increasing until 1990. In 1991 the expenditures for food were lower as compared to 1990.