Inadequate salt intake on ketogenic/carnivore diets can spike cortisol, disrupt hormone balance, and increase stress.

“a lot of people when they do ketogenic diets don't get enough salt and do all of all of this literature saying that cortisol Rises or stress hormone spike on ketogenic diets are hinged on the fact that those studies were done in metabolic wards where people who are actually sodium limited and so if people are doing ketogenic or carnivore diets and they're not getting enough salt they could really be spiking their cortisol”