A household that cooks more meals at home after cutting back on restaurant visits may still feel squeezed at the checkout, even as a broad food figure looks calm. That is because grocery prices and meals bought away from home are tracked separately in the Consumer Price Index (CPI). In September 2026, the grocery index slipped while restaurant prices rose. The divergence reflects distinct baskets and pricing pressures, not a contradiction in the data or a forecast of what any one household will pay.
Two baskets, one food headline
The CPI divides food into “food at home,” which mainly covers groceries, and “food away from home,” which includes meals from full-service and limited-service restaurants. These categories represent different kinds of purchases. A grocery basket includes ingredients and packaged foods; restaurant prices cover prepared meals and the services involved in selling them. The headline “food” index combines the categories using spending weights, so it can smooth over opposite monthly movements.
In September, the overall food index was unchanged from August. Food at home fell 0.1 percent, while food away from home rose 0.2 percent. Over the 12 months through September, groceries rose 1.8 percent and meals away from home rose 3.5 percent Bureau of Labor Statistics. The combined number answers a broad question about average food-price change; it does not say that every food purchase moved in step.
The costs behind a meal are different
Grocery and restaurant prices can respond to different pressures. The price of ingredients matters to both, but it is only one part of a restaurant’s costs. Preparing and serving a meal also involves labor, space, equipment and other operating expenses. A supermarket sells ingredients and packaged goods through a different process. The CPI reports price changes in each category; it does not establish which cost caused a particular movement, or how much any one business passed through to customers.
The September detail shows variation even inside each basket. Three of the six major grocery food-group indexes rose and three fell. Dairy and related products were down 0.9 percent for the month, while fruits and vegetables rose 0.5 percent. Full-service meals rose 0.3 percent and limited-service meals 0.2 percent Bureau of Labor Statistics. A shopper buying milk and produce, or choosing between a restaurant and a quick-service meal, encounters a different mix than the category average.
A household can change its own mix
Consider a household that replaces two restaurant dinners with meals cooked at home. Its spending shifts between the two categories: it buys more groceries and fewer meals away from home. If restaurant prices rise faster than grocery prices, that substitution may soften the household’s exposure to the faster-moving category. But it does not guarantee a lower food bill. The ingredients chosen, quantities bought, restaurant prices paid and amount of cooking all matter.
The CPI is a weighted measure of average price change for a representative basket, not a personalized cost tracker. BLS explains that its market basket draws on household expenditure information and that the index may not match an individual’s experience Bureau of Labor Statistics. A household with particular dietary needs or little time to cook may have a different spending pattern. A shift toward groceries changes what that household buys; it does not change what the CPI measured.
Read the measure that matches the question
For a question about supermarket prices, look at food at home. For restaurant meals, use food away from home. The combined food index remains useful for a broad view, but the two components help explain why a diner and a grocery shopper can describe very different price experiences in the same month. Monthly changes also differ from 12-month changes: September’s grocery dip was a one-month move within an index that was higher than a year earlier.
Consumer spending surveys help shape the relative importance of categories in the CPI basket, but the published index still summarizes price movements across many households and purchases Bureau of Labor Statistics. It cannot tell a family what dinner will cost or prove that switching from restaurants to home cooking will save a set amount. The useful distinction is straightforward: compare the category that reflects the purchase, then treat the combined food figure as an average across both kinds of meals.
Sources & further reading
- September 2026 Consumer Price Index ↗Bureau of Labor Statistics
- Consumer Price Index questions and answers ↗Bureau of Labor Statistics
- Consumer expenditures ↗Bureau of Labor Statistics
