That’s just it. Zero Carb diets make you stop using the citric acid cycle (Krebs).
Instead, if you don’t take in much glucose, you don’t produce much pyruvate, which doesn’t get converted to much acetyl-CoA, meaning the citric acid cycle won’t run.
Now how will you ever get energy?
Your body now thinks that you are starving to death. Instead of using glucose, it decides that now would be a good time to burn fatty acids (lipolysis). This produces ketone bodies and a condition called ketosis. Ketone bodies will keep feeding your brain without the use of glucose.
Also, your body produces enough glucose to get along just fine without having to ingest it.
Again...argue all you like.
I’ve been doing this over 5 years, VERY strictly. Test after test say my health is better than ever. Da Doctors say so, too.
Fat feeds into the Krebs cycle.
Look it up.