Tea contains 4 substances that have stimulatory effects on your brain.
The most well-known is caffeine, a potent stimulant that you can also get from coffee and soft drinks.
Tea also contains two substances related to caffeine: theobromine and theophylline.
Finally, it provides a rather unique amino acid called L-theanine, which has some very interesting effects on the brain.
Coffee, the biggest source of caffeine, also happens to be one of the biggest sources of antioxidants in the Western diet, and consuming it has been associated with various health benefits.
The second largest source of caffeine worldwide is tea, which tends to provide a moderate amount of caffeine, depending on the type.
Caffeine stimulates the central nervous system, increases vigilance and reduces drowsiness.
There are several theories about how it works. The main one is that it is believed to block an inhibitory neurotransmitter called adenosine at certain synapses in the brain, leading to a net stimulant effect.
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