The nutritional requirement for carbohydrates is zero.

I don't know much about the people who went all meat and had problems. Since it is important, as noted would unbalance one's electrolytes if done improperly, this might be a complicating factor in the side effects I hear about.

Sodium is easy, potassium is high in meat and avocado, and I have upped my chelated magnesium recently with good results.