LOL yeah, I just spoke to a dietician the other day who swore that glucose is the only thing your brain can use for fuel.
It's easy to be ignorant about a situation you never experience. Every single person they deal with is going to be in a carb-adapted state and never miss a meal, so their body will run entirely off of glucose.
I vaguely remember reading about this in "The Ketogenic Diet". There are some functions that do require glucose. However, your body can convert enough fat and protein into glucose to satisfy that.
Yeah, that was a TIL moment for me when I found out the body can make glucose without carbohydrate. There were others, like how mitochondria burn fat more efficiently than glucose.
It's easy to be ignorant about a situation you never experience. Every single person they deal with is going to be in a carb-adapted state and never miss a meal, so their body will run entirely off of glucose.