The Sprawl of Food Deserts

Article excerpt

The North American urban landscape has changed considerably over the past few decades with the advent of the automobile as the transportation mode of choice, Privatized mobility allowed wealthier people to move outward from city centers toward the suburbs, and with them went many of the supermarkets that used to pervade urban areas. The steady suburbanization of major food retailers is contributing to the emergence of urban "food deserts," areas within city centers where low-income people have poor access to vegetables, fruits, and other whole foods. Because many chronic diseases have been associated with low consumption of vegetables and fruits, along with high consumption of sugary or high-fat foods, urban food deserts may be taking a health toll on those who live in socially deprived neighborhoods.

Canadian researchers at The University of Western Ontario recently studied the evolution of food deserts since the 1960s in the mid-sized city of London, Ontario. They used a geographic information system (GIS) to map locations of supermarkets in 1961 and 2005. Then they assessed changes in supermarket access in relation to neighborhood location, socioeconomic characteristics, and access to public transit using multiple "network analysis" techniques, which take into account variations in how people are spaced and actually move throughout their environs.

In an article published 18 April 2008 in the online International Journal of Health Geographics, the research team reported that low-income residents of London's inner-city neighborhoods had poorer access to super markets than middle- and high-income residents. Moreover, spatial inequalities in access to supermarkets had increased over time. In 1961, more than 75% of London's inner-city population lived within 1 kilometer of a supermarket, giving them easy access to a variety of foods, says principal investigator Jason Gilliland, who directs the university's Urban Development Program. In 2005, he says, that number was less than 20%.

"One can say that this problem may only get worse in the near future, considering current concerns about rising food prices and food scarcity," says Isaac Luginaah, Canada Research Chair in Health Geography at The University of Western Ontario. …