Food access describes how easily people can obtain affordable, nutritious food on a regular basis. It goes beyond whether grocery stores exist in a region. It includes physical distance to stores, whether you can afford what’s on the shelves, whether you have transportation, and whether the food available matches your dietary and cultural needs. In the U.S., about 13.7% of households were food insecure at some point during 2024, meaning they lacked reliable access to enough food for an active, healthy life.
Physical Access: Distance to a Grocery Store
The most straightforward barrier to food access is geography. The USDA measures this by identifying census tracts where at least 500 people, or 33% of the population, live far from the nearest supermarket or large grocery store. In urban areas, the threshold is typically 1 mile. In rural areas, it’s 10 miles. Some measures use a stricter half-mile cutoff for cities or a 20-mile cutoff for the most remote rural communities.
The USDA previously called these areas “food deserts” but now uses the term “low-income and low-access” tracts because it more accurately reflects what the data actually measure. Living in one of these tracts doesn’t automatically mean you’re going hungry. It means the infrastructure around you makes it harder to get fresh, healthy food without a car, reliable public transit, or extra time and money.
Economic Access: Affording a Healthy Diet
Even when a grocery store is nearby, price determines what ends up in the cart. The USDA’s Thrifty Food Plan estimates that a family of four (two adults aged 20 to 50 and two children aged 6 to 11) needs roughly $993 per month to eat a basic nutritious diet. For households living paycheck to paycheck, that number is a significant share of income.
Federal nutrition assistance helps close the gap, but not entirely. SNAP (formerly food stamps) served an average of 41.7 million people per month in fiscal year 2024, with benefits averaging $187.20 per person per month. That works out to about $6.24 per day, which often falls short of what a balanced diet costs, particularly in areas where food prices run above the national average.
Who Is Most Affected
Food access problems don’t fall evenly across the population. According to USDA data from 2016 to 2021, American Indian and Alaska Native households had the highest food insecurity rate of any racial or ethnic group at 23.3%, more than double the national average of 11.1%. Black households were 1.9 times as likely to be food insecure as the average household, and Hispanic households were 1.5 times as likely. Asian American households had the lowest rate at 5.4%.
These gaps reflect overlapping disadvantages: lower average incomes, fewer supermarkets in predominantly Black and Latino neighborhoods, less reliable transportation, and historical patterns of disinvestment that left some communities with convenience stores and fast food but few full-service grocers.
Cultural Dimensions of Food Access
Access isn’t only about calories and nutrients. For immigrant communities and second-generation Americans, the ability to find culturally familiar foods matters for identity and well-being. Research on second-generation college students found that cultural food security, meaning reliable access to the foods tied to their heritage, directly influenced their ability to practice foodways and maintain a connection to their cultural identity. When the only nearby stores don’t carry staple ingredients for your cuisine, or when labels and staff don’t accommodate your language, a technically “accessible” grocery store can still feel out of reach.
How Limited Access Affects Health
When healthy food is hard to get, diet quality drops. Nationally, food-insecure adults score about 2.2 points lower on the Healthy Eating Index (a 100-point scale measuring diet quality) compared to food-secure adults. That gap widens in certain groups. Among Asian Americans, the difference between food-secure and food-insecure adults was nearly 5.6 points. These may sound like small numbers on a 100-point scale, but they represent consistent, population-wide shifts toward less nutritious eating patterns.
Over time, those patterns contribute to chronic disease. A large national study using NHANES data found that food-insecure adults had a 20% higher risk of hypertension and a 30% higher risk of high cholesterol compared to food-secure adults, after adjusting for other factors. The link to diabetes was even more pronounced among people experiencing severe food insecurity, who had roughly 2.4 times the risk of showing clinical signs of diabetes. Among women specifically, food insecurity was also associated with higher BMI.
The connection between food insecurity and chronic disease runs in both directions. Poor access leads to cheaper, calorie-dense diets high in processed carbohydrates and sodium. At the same time, managing a chronic condition like diabetes requires consistent access to specific foods, which becomes harder when access is already limited.
Programs That Improve Access
Several approaches have shown measurable results. Mobile produce markets, essentially trucks or pop-up stands that bring fresh fruits and vegetables directly into low-access neighborhoods, are one of the more promising models. In a study of mobile markets in Rhode Island, about 85% of shoppers reported buying and eating more fruits and vegetables because of the market. SNAP recipients who used incentive programs at these markets were roughly three times as likely to report increased fruit and vegetable purchases compared to non-SNAP shoppers.
A cluster randomized trial called Live Well, Viva Bien found that participants at low-income housing sites with mobile market access increased their total fruit and vegetable intake by about half a cup per day. That’s a meaningful shift when baseline intake is already low.
Beyond mobile markets, SNAP incentive programs (sometimes called “Double Up” programs) effectively double the purchasing power of benefits when used for produce. Community gardens, food co-ops, and partnerships between healthcare providers and local farms represent other strategies that address both the physical and economic sides of access. None of these fully replace the need for permanent grocery infrastructure, but they fill critical gaps in neighborhoods where traditional retail has been slow to invest.