(is-a 'pizza 'food)
(not (is-a 'glue 'food))
(for-all i ingredients
(assert-is-a i 'food))Also: MEAT GLUE (transglutanimase)!
https://en.wikipedia.org/wiki/Transglutaminase
https://en.wikipedia.org/wiki/Molecular_gastronomy
https://lyndeymilan.blogspot.com/2010/01/question-what-is-oc...