Food deserts are located in high-poverty areas, such as sparsely populated rural areas or densely populated, low-income urban centers. Food deserts most often develop when major supermarket chains either relocate out of these areas or simply refrain from building stores there in the first place. Major food retailer chains tend to limit their store locations to wealthier urban or suburban neighborhoods. This means that those who live in high-poverty areas often also live miles away from the fresh meats, dairy products, and produce available at supermarkets. Residents of these areas who do not have cars are thus forced to travel long distances on public transportation to do their grocery shopping, or else they are limited to the food available at local convenience stores and gas stations. These types of food retailers often only sell packaged, processed foods that offer little nutritional value.