This is the CodeSystem that contains all the codes in Diet (http://terminology.hl7.org/CodeSystem/diet) and Diet (http://terminology.hl7.org/CodeSystem/diet). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 21d0d52d-6932-4516-ad29-944d62abcb69-887
This code system http://hl7.org/fhir/comparison/CodeSystem/21d0d52d-6932-4516-ad29-944d62abcb69-887
defines codes, but no codes are represented here