The Food Expenditure Series tracks annual and monthly trends in the U.S. food system since 1869. Produced by USDA’s Economic Research Service (ERS), the Food Expenditure Series quantifies the value of food acquisitions in the United States by type of sales outlet (e.g., grocery stores, warehouse clubs and supercenters, restaurants, recreational facilities, and so on) and product (e.g., packaged products meant for off-premises consumption, and meals and snacks meant for on-premises consumption). These data complement other USDA, ERS datasets that are used to gauge and track developments in consumer food-purchasing behaviors and the food supply. ERS researchers recently updated the methods and data used in the Food Expenditure Series, revising estimates back to 1997. Because of the extent of the changes, the comprehensive revision establishes a break with the previously published Food Expenditure Series. The trends shown in and the magnitude of the revised Food Expenditure Series estimates are comparable to household expenditure data estimated by other Federal Government agencies.