Regulation of food and dietary supplements by the U.S. Food and Drug Administration whether it is to be regulated as a food or as a drug, based on the claims that the manufacturer or seller makes about its properties. The FDA is authorized to issue a standard of identity for any food. This is a description of what, exactly, must be in that food in order for it to be identified under a certain name. For example, a court has upheld an FDA ruling that for a product to be sold as cream cheese, it must contain a specified minimum percentage of milk fat, and a maximum level of moisture. Incorrectly identifying a
Diet food may be regulated by law. For example, in the U.S. a product labeled as "low fat" must not contain more than 3 grams of fat per serving; and to be labeled "fat free" it must contain less than 0.5 grams of fat per serving. The process of making a diet version of a food usually requires finding an acceptable low-food-energy substitute for some high-food-energy ingredient. This can be as simple as replacing some or all of the food's sugar with a sugar substitute as is common with diet soft drinks such as Coca-Cola (for example Diet Coke). In some snacks,