A recent study suggests that green tea a day boosts your enzyme production, in turn making it easier to fight cancer.

The study mentions that this result was found by using green tea concentrate equal to 8-16 cups of green tea. This makes me wonder whether it may cause some side effects, considering this earlier study that showed how amounts of over 10 cups of green tea a day can cause kidney and liver damage.

Apparently, drinking green tea in large quantities can cause kidney and liver damage. The New Scientist article reporting about this mentions that “up to 10 small cups of green tea a day is fine”. Rather unscientifically, it doesn’t tell us what the volume of a “small cup” is, but I take it to be around 200mL. This would mean that it’s still ok to drink up to 2 litres of green tea a day. I’ll need to keep that in mind, as my cups are 0.7L, and I can easily drink three of them a day (although I keep switching between green and rooibos tea).

Those taking green tea supplements should, however, apparently be somewhat concerned.