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Starved for Access: Life in Rural America's Food Deserts

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Methodology<br />

Mapp<strong>in</strong>g<br />

To identify populations <strong>in</strong> U.S. counties that have limited access to large supermarkets or supercenters, we used<br />

ARCVIEW Geographic In<strong>for</strong>mation System (GIS) mapp<strong>in</strong>g software to identify populations that reside with<strong>in</strong> a given<br />

distance from supermarkets and supercenters. We selected zip codes that conta<strong>in</strong>ed at least one supermarket with<br />

50 or more employees or supercenter/wholesale club <strong>in</strong> 1999. We matched zip code data from ZBP to the 1999<br />

U.S. Bureau of the Census Zip Code File to obta<strong>in</strong> longitude and latitude coord<strong>in</strong>ates. We selected all census block<br />

groups whose boundaries <strong>in</strong>tersect a 10-mile radius of the zip codes that conta<strong>in</strong>ed supermarkets or supercenters.<br />

Block groups fall<strong>in</strong>g outside the 10-mile radius were classified as low food access areas. After obta<strong>in</strong><strong>in</strong>g the<br />

population housed <strong>in</strong> low food access areas <strong>for</strong> each county, we divided by the county’s total population to obta<strong>in</strong><br />

the percentage of the population resid<strong>in</strong>g <strong>in</strong> a low food access area. A detailed explanation of this method is<br />

provided by Blanchard and Lyson. 4<br />

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(2) Nearly two-thirds did not consume<br />

adequate amounts of vegetables;<br />

(3) More than one-third (34%) lacked<br />

adequate dairy <strong>in</strong> their diet;<br />

(4) More than one-fourth lacked the<br />

recommended levels of prote<strong>in</strong> <strong>in</strong> their diet.<br />

As a whole, these results suggest that a sizable<br />

number of people <strong>in</strong> these four food desert<br />

counties are lack<strong>in</strong>g healthy, nutritious diets.<br />

Left unanswered, however, is whether their<br />

poor diets are the result of limited access to<br />

healthy food or an issue of cost. Past research<br />

suggests that small grocery stores have a<br />

limited variety of quality foods and tend to<br />

<br />

Figure 1: Average Proportion of Residents Across Four <strong>Food</strong> <strong>Deserts</strong> <strong>in</strong> Iowa who...<br />

5

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