In an early case of industrial espionage, Robert Fortune disguised himself as a local and took tea leaves and the secrets of ...

Black tea, in particular, is pretty high in oxalates. Some studies have shown that drinking very large amounts—like 6-8 cups a day—can raise your risk of kidney stone formation.

How someone makes a cup of tea can be an indicator of brain health Credit: Getty. In the UK a study published in The Lancet earlier this year found that on current trends up to 1.7 million people ...