US FDA Food Labeling Regulations (21 CFR Part 101) 101.18: Misbranding of food: false or misleading labeling, misleading statements of identity, undue prominence of an ingredient (for example 'butter' in a shortening blend), and misleading pictorial representations (101.18)

Among the representations in labeling that render a food misbranded are false or misleading statements about the food's composition, undue prominence given to an ingredient that is present only in small amounts (such as a product name featuring a premium ingredient that is not the predominant one), labeling that gives the impression that a food is a different food, pictorial representations that misrepresent the contents, and any claim that the food is of a particular origin or nature that it is not. This sits alongside the general misbranding prohibition in section 403(a) of the FD&C Act.