A person on the keto diet, especially someone who proselytizes for it
Chris lost thirty pounds since becoming a card-carrying ketomite.
I just saw Angie and she's turned into such a ketomite that she can't shut up about it.
I was going to try the keto diet but the constant preaching of the ketomites turned me off.
Jimmy is so deep into his ketomite trip that he should change his name to Keto O'Rourke.
Anyone who eats keto and only wear Ketonian Lifestyle t-shirts. They're often found on r/keto sharing success stories.
That guy used to look like a Snorlax, but he now looks like a Machamp; he must be a ketonian!
That woman had made so much progress in a month. I've never seen anyone lose weight that quickly. She must be a ketonian!