Tea has half the amount of caffeine than coffee and far less than coke, nevertheless, too much of a good thing CAN cause insomnia and nervousness. Note that out of the three main types of tea, black tea contains the most caffeine.

Extensive research shows that up to 300 milligrams of caffeine (about eight cups of tea) is not a health risk.

Anaemics should avoid excessive tea drinking with meals because the antioxidant properties of tea can reduce an individual's ability to absorb iron.

Too much tea can discolour your teeth