Green tea contains some caffeine, which could make it harder to fall asleep. Generally, chai made from inexperienced or oolong tea accommodates much less caffeine than chai made from black tea. While black tea, espresso, and espresso bring essentially the most caffeine to the desk, green tea packs a average amount as well. Researchers report that when consumed in moderate quantities, caffeinated drinks - including tea - are as hydrating as water. Tea - especially consumed in reasonable portions - is unlikely to have any dehydrating effects. Though tea is lower in caffeine than many other caffeinated drinks, drinking massive portions might have an effect on your hydration standing. Black, green, white, and oolong teas include caffeine, which can have an effect on your hydration standing. Black, green, and white teas are prepared from leaves of the identical plant, Camellia sinensis. In a single examine, 50 heavy coffee drinkers consumed either 26.5 ounces (800 ml) of coffee or the identical quantity of water every All Day Slimming Tea official site for three consecutive days. A mean 8-ounce (237-ml) cup of coffee incorporates 90 to 200 mg of caffeine. As the common cup of tea accommodates 2 grams of tea leaves, one cup (240 ml) of tea will have round 33-38 mg of caffeine - with black and oolong containing the most.