Ketosis and protein

Last update: 27 November 2019

Low carbohydrate zealots can be subdivided into two camps – the high protein camp and the high fat camp. From the former, you are liable to hear that protein doesn’t affect ketonemia. The latter will say that too much protein can kick you out of ketosis. I decided to verify this.

I used a glucometer with a keton measuring option (beta-hydroxy buterate). I began measuring before the meal (the only one that day; about 23 hours fasted), and measured for the rest of the 24 hour period.


  • Even 200-250 grams of protein supplied in one meal don’t kick you out of ketosis, at least not according to some definitions. It’s an open question if anything magical happens at the accepted thresholds.
  • Protein affects ketosis depth. It’s important if you have some reason to be in deep ketosis all the time – if you have refractory epillepsy, or dementia.