If by “knock you off your diet” you mean “knock you out of ketosis”, then eating enough protein will do that. I experimented with a keto diet for a neurologica

If by “knock you off your diet” you mean “knock you out of ketosis”, then eating enough protein will do that. I experimented with a keto diet for a neurological condition. I invested in some blood ketone measuring strips and was surprised how difficult it was to stay in ketosis. Anything more than a medium chicken breast in one meal does it for me. Other metabolisms may be different.