How does caffeine make you more alert and work as a cognitive enhancer if it reduces blood flow to the brain?

Question

I’ve just read that a 250mg dose of caffeine can reduce blood flow to the brain by 22%-30%.

It seems counter intuitive to me that a chemical that restricts blood flow to the organ responsible for all mental operations actually improves our mental functioning.

There’s probably a simple answer but 22-30% seems like it would significantly impair the brain’s functioning

In: 129

Answer 1

The thing is caffeine doesn’t “wake you up” more like it blocks tirednesses so you can keep working without feeling drowsy, but also 250mg is a lot of caffeine, something like drinking five espressos in a row but in regular doses it doesn’t have such acure side effects