Which preposition to use with vegetarian

in Occurrences 3%

He only ceased to be a vegetarian in obedience to the remonstrance of his unphilosophical father, who would have easily tolerated what he regarded as a mere vagary had it not involved the danger of giving rise to a calumny.

as Occurrences 1%

But for the benefit of such as are like the advertised domestic "willing to learn," I would say that vegetarians as a rule use fresh vegetables practically in the same way as meat eaters do, to supplement more substantial viands.

with Occurrences 1%

He had been living on roots and berries for weeks and now began to experience that hankering for flesh that comes on every candid vegetarian with dangerous force from time to time.

Which preposition to use with  vegetarian