Someone on a keto diet who rejects any idea of eating something they believe "Is not Ketogenic" and projects these ideas on other people (even though they are wrong)... They may also be referred to as a "Keto Nazi" depending on how sever or radical their protests against some foods can be. It is unknown where their beliefs start, or how they come up with the definitions for "non-keto food"... Little is known about the Keto Cop/Nazi other than they are most reportedly found on facebook groups, and rarely on reddit pages.

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