Green tea does more than just keep you awake, it can also make you smarter. The key active ingredient is caffeine, which is a known stimulant. It doesn’t contain as much as coffee, but enough to produce a response without causing the “jittery” effects associated with too much caffeine.
Caffeine blocks a neurotransmitter called adenosine. This in turn, increases the firing of neurons and the concentration of neurotransmitters like dopamine and norepinephrine.
Caffeine has been intensively studied before and consistently leads to improvements in various aspects of brain function, including improved mood, vigilance, reaction time and memory.
However, green tea contains more than just caffeine. It also has the amino acid L-theanine which increases the activity of GABA. GABA has anti-anxiety effects. It also increases dopamine and the production of alpha waves in the brain.
Many people report having more stable energy and being much more productive when they drink green tea, compared to coffee.
Try it hot … or try it cold. Just try it!