Green tea is also a major source of oxalate, which can cause kidney stones. This suggests that drinking more than five cups of green tea a day (or taking the equivalent in catechin capsules) might have more risks than benefits.
When consumed wisely, though, green tea may improve your cardiovascular health.
“The bottom line is that no serious red flags were seen in the amount of tea they were testing. It appears that a few cups a day may be beneficial,” said Ms McManus to Harvard Health.
General tips to lower your risk of having a stroke
According to the NHS, it’s possible to significantly reduce your risk of having a stroke by making lifestyle changes to avoid problems such as atherosclerosis and high blood pressure.