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From page 467...
... Commercial operations provide universal product code (UPC) level data including weights that allow estimation of the total sales of each UPC level food during a specified time (e.g., weekly, quarterly, annually)
From page 468...
... The analysis will likely need to focus on the top-selling products based on the availability of nutrient data at the UPC level from outside vendors. Foods that are prepared and packaged within a retail establishment are not currently required to include the Nutrition Facts panel; thus, the sodium content of these foods cannot be monitored without linking through other types of data sources that would require substantially more manual effort.
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