A food desert is an area, especially one with low-income residents, that has limited access to affordable and nutritious food. In contrast, an area with supermarkets or vegetable shops is a food oasis. The designation considers the type and quality of food available to the population, in addition to the number, nature, and size of food stores that are accessible. Food deserts are characterized by a lack of supermarkets which decreases residents' access to fruits, vegetables and other whole foods.
In 2010, the United States Department of Agriculture (USDA) reported that 23.5 million Americans live in a food desert, meaning that they live more than one mile from a supermarket in urban or suburban areas, and more than 10 miles from a supermarket in rural areas. Food deserts lack whole food providers who supply fresh protein sources (such as poultry, fish and meats) along with whole food such as fresh fruits and vegetables, and instead provide processed and sugar- and fat-laden foods in convenience stores. Processed, sugar- and fat-laden foods are known contributors to the United States' obesity epidemic. Convenience store prices are less affordable to regular consumers around the area.