1385: Food Deserts | Skeptical Sunday

What It Covers

Jordan Harbinger and researcher Jessica Wynn examine the food desert narrative — the decades-long, billion-dollar policy effort to improve low-income community health by building grocery stores nearby. Using Nielsen data from 60,000 households, USDA research, and case studies from Philadelphia, Pittsburgh, and New York, they reveal why proximity to healthy food barely moves the nutritional needle.

Key Questions Answered

• •Food Access vs. Food Choice: A Stanford/Chicago Booth/NYU study using 60,000 households found that fully equalizing food access and prices would close only 9-10% of the diet quality gap between low and high-income households. The remaining 90% reflects learned preferences shaped by culture, advertising, stress, and childhood food environments — none of which a new supermarket addresses.
• •People Already Shop at Supermarkets: Nielsen data tracking 60,000 households over a decade found that residents in food desert areas already purchased nearly 90% of groceries from supermarkets. Low-income households under $25,000 annually travel roughly five miles each way; food desert residents travel seven. The barrier is inconvenience, not total inaccessibility — a critical distinction that invalidates the core policy premise.
• •Grocery Store Openings Produce Near-Zero Diet Change: Researchers tracked 6,700+ supermarkets opening across the US between 2004 and 2016, measuring diet quality before and after using the Healthy Eating Index. New stores improved nearby household diet quality by just 0.021 standard deviations — approximately 1.5% of the diet gap between lower and higher-income households. A billion dollars in federal investment produced functionally invisible nutritional results.
• •Food Swamps Outweigh Food Deserts: A cross-sectional study of 3,000+ US counties found that high food swamp scores — areas saturated with fast food and convenience stores relative to healthy options — correlated with 77% higher obesity-related cancer mortality rates than the highest food desert scores. Regulating fast food density, changing marketing practices, and limiting dollar store clustering addresses the actual mechanism driving poor health outcomes.
• •Agricultural Subsidies Undermine Nutrition Policy: The federal government spent approximately $9.3 billion on commodity crop subsidies in 2024, with corn receiving $3 billion and soybeans $1.9 billion. These crops become high-fructose corn syrup, soybean oil, and ultra-processed food ingredients. From the mid-1980s through the 2010s, processed food prices fell while fresh fruit and vegetable prices rose — making junk food the structurally cheaper option while separate programs tried to fix the consequences.
• •Subsidizing Healthy Food Prices Works Better: Economists estimate that making fruits and vegetables financially competitive with junk food for low-income households would cost roughly $11 billion annually — about 15% of the 2024 SNAP budget of $99.8 billion. This price-based intervention targets the actual driver of food choice. Expanding online SNAP purchasing through platforms like Instacart and DoorDash addresses mobility barriers, though delivery fees and markups currently add 35-50% to total grocery costs.