A diet lacking carbohydrates and limiting fats while consuming high amounts of protein can lead to low energy levels.

“A lot of people that are doing carnivore might be just having a lot of excess protein and really are not having a lot of fat and that's probably one of the reasons why they don't feel like they have much energy because if you're talking about fat and carbs being the main energy sources if you're not having carbs and you're limiting your fats and getting a whole lot of protein of course you're gonna feel like absolute dog crap starvation”