The foods collected for the TDS market baskets represent the major components of the average diet of the U.S. population, from infants to adults, based on results of national food-consumption surveys.
In the 2003 food-list update, it was begin applying to market-basket collections in 2003, food list was based on the USDA’s 1994-96, 1998 Continuing Survey of Food Intakes by Individuals (CSFII) (USDA, 2000). The survey included detailed information on the types and amounts of food consumed by the survey participants, who collectively reported on more than 5,000 different foods (USDA, 2000).
For each group, the most-consumed food within that group is assigned as the representative of all the foods in the group, and designated it as the TDS food; in other words, each of the 280 foods on the TDS Food List may actually represent several foods.
Consumption Amounts: Each of the approximately 10-year iterations of the TDS is based not only on an updated food list, but also on updated consumption amounts. To estimate dietary exposure to each TDS analyte:
– determine the average level of that analyte in each TDS food.
– estimate the average amount the U.S. population (or age / gender subpopulation) consumes of each TDS food.
– for each TDS food, multiply the average level of that analyte in that food by the average amount the U.S. population (or age / gender subpopulation) consumes of that food.
– combine the results to arrive at the estimated total dietary exposure to the analyte among the U.S. population (or age / gender subpopulation).