Green tea is one of the healthiest beverages on the planet.
It contains caffeine, which improves alertness and mood, along with raising metabolic rate (15, 18, 19).
Green tea provides only 35–70 mg of caffeine per cup, which is about half the amount in coffee.
Green tea may be especially helpful against diabetes. A review of 17 studies found that green tea drinkers had reductions in blood sugar and insulin levels (61).
It also contains an antioxidant known as EGCG, which may protect the brain, nervous system and heart from damage (62, 63, 64, 65).
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Green tea has many health benefits. It contains an antioxidant called EGCG, which has benefits for the brain and nervous system.