The catechins in green tea play a major role in boosting your immune function. The tea protects against oxidants and radicals, thereby enhancing immunity (17).
The EGCG in green tea has the ability to increase the number of regulatory T cells – and these help improve immune function and suppress autoimmune diseases (18).
Green tea also does contain caffeine, but not as much as coffee. Hence, it offers you the benefits of caffeine without producing the jittery effects of too much of it. Caffeine blocks the activity of adenosine, an inhibitory neurotransmitter in the brain. As a result, it improves the firing of neurons and enhances brain health (19).
More important than caffeine in green tea is an amino acid called L-theanine, which crosses the blood-brain barrier and boosts brain health (20). This amino acid increases the activity of GABA, another inhibitory neurotransmitter (but the good one), which has anti-anxiety effects (21).
Both caffeine and L-theanine in green tea, together, can have better effects as they have been found to work in synergy. This is a powerful combination for brain health (22).
Green tea can also aid in the treatment or prevention of serious brain ailments like Alzheimer’s and Parkinsons’ disease. Studies have found that individuals who drank green tea once to six times in a week had fewer chances of mental decline (23). Green tea can also cut the risk of age-related dementia. It also enhances memory.
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