Question

Which is used to supply some of fuel needed by brain during fasting?

Answer 1

Years ago a neurologist teased apart human brain tissue and observed that 10% of it was neurons and 90% was glial cells and other non-neuronal tissue. So yes, we can suppose only 10% of the brain is really brain. But the notion that we use only 10% of our MENTAL CAPABILITIES is regarded as nonsense. There is no way to measure this. As far as brain activity is concerned, we use parts of our brain for various things, and extreme brain activity is not a sign that things are going well.