What constitutes serving size/how is the serving size chosen for certain foods?
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They’re specified by federal regulation, based on a surprisingly expansive survey of how much people eat.
> A serving size is the amount of food customarily consumed (i.e., typically eaten) in one sitting for that food (section 403(q)(1)(A)(i) of the FD&C Act).
>Serving sizes are determined from the RACCs established in [21 CFR 101.12(b)](https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/cfrsearch.cfm?fr=101.12) and the procedures described in [21 CFR 101.9(b)](https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=101.9).
> A serving size should be written in a common household measure (e.g., cup, tablespoon, piece, slice, fraction (e.g., 1/4 pizza), ounce (oz), fluid ounce (fl oz), or other common household equipment used to package food products (e.g., jar, tray)) as defined under 21 CFR 101.9(b)(5).
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