Researchers from the University of Warwick and the University of Naples have analysed data from eleven different studies and have pooled the results in order to gain an accurate overall outcome.
The study, which has been published in the Journal of the American College of Cardiology found that a daily potassium intake of around 1,600 milligrammes (which is only half of the recommended daily intake) can lower stroke risk by more than a fifth.
500 milligrammes of potassium is the average contents of a banana, meaning that eating three a day could provide enough potassium to help to lower blood pressure and control fluid balance in the body.
If you are not keen on bananas then other potassium rich foods include spinach, lentils, milk, fish and nuts
A spokesman for the Stroke Association said: ‘This research suggests eating lots of potassium-rich foods, such as bananas, dates and spinach, could reduce your risk of having a stroke.
‘High blood pressure is the single biggest risk factor for stroke and past research has indicated that potassium could help to lower blood pressure.
‘This could go some way to explain the positive effects of potassium demonstrated in this study.’