Maize is the main source of calories and protein in the Guatemalan diet. White maize is more heavily consumed than yellow maize, but the latter is preferred in some regions and used as poultry feed. Every Guatemalan household consumes black beans: as a protein source it is a particularly valuable complement to cereals in regions where households have limited access to animal products. Consumption habits are strongly linked to tradition and culture. Rice is mainly consumed in urban and peri-urban, but some rural households consume it as well. Guatemala is highly dependent on imported rice. The market in Guatemala City is the largest in the country and feeds the highest concentration of the population.