I want to know the answer to the following question:
Where does the brain usually get most of its energy from inside the body?
All the background I'm provided with is that "The energy consumption of the brain does not vary greatly over time, but active regions of the cerebral cortex consume somewhat more energy than inactive regions; this forms the basis for the functional brain imaging methods PET, fMRI, and NIRS.". Is that enough to answer the question?
Answer: no