The data on the health effects of green and black teas are continuing to come out, with some of it contradicting earlier studies and much of it still quite preliminary. Let's start with coffee.
Coffee is a strong stimulant that can be addictive and can irritate many of our internal systems.
The caffeine in coffee can worsen heart disease, high cholesterol, hypertension, indigestion, mood swings and a whole slew of other conditions. Even though tea contains caffeine, less of it winds up in the finished brew. Both green and black teas are made from the same plant , Camillia sinensis , an attractive shrub. For green tea the leaves are briefly steamed, then dried. Scented teas are mixed with dried flower petals and essential oils.