any Qxxxxxx is a Wikidata topic.  (also called an entity)

any Pxxxx is a Wikidata property.

that equivalent class =  http://health-lifesci.schema.org/Diet

needs to be removed and changed to

'external subclass'  =  http://health-lifesci.schema.org/Diet

The reason is that our definition in Schema.org is slightly different than https://www.wikidata.org/wiki/Q474191  which is the biological definition (a mixture of food sources that sustains a living thing) and from that derives the nutritional definition, the one Schema.org has, like a specific diet like 'Thad's Special Vegan Diet without olives :)

So we need a new 'external subclass' made available in Wikidata please.