Caffiene is considered to be a psycho stimulant.
It blocks adenosine — a chemical that helps people fall asleep — from adhering to its receptors in the brain.
Adenosine helps open up blood vessels. Blocking it constricts the brain’s blood vessels, which injects adrenaline into the system. This results in a ‘coffee boost’.
It increases the release of dopamine in the centre of the brain.
Dopamine is a neurotransmitter that activates pleasure centres in certain parts of the brain.
It increases alertness and provides a mental boost.
It improves performance for a short time on a variety of learning, memory, thinking and attention tasks.
Caffeine can increase anxiety and lead to the development of anxiety disorders.
Sources:
Coffee, Tea, Chocolate and the
Brain edited by Astrid Nehlig