Can potassium cut your stroke risk?

If you want to reduce your risk of having a stroke, you might want to cut down on salt. But would you think about how much potassium you're eating? A series of studies in the BMJ show that reducing salt to 3g a day and increasing potassium-rich foods – fruit and vegetables are good sources – would help to prevent strokes by reducing high blood pressure. So should you ditch the crisps and grab a banana instead? 
The solution
Potassium is a chemical that is essential for cells to work properly. It's particularly important in nerve and muscle cells but it is also essential to help keep the body's fluid balance in a steady state.
Low levels of potassium in the blood can cause weakness and muscle cramps. It is rare to get these problems from eating too little potassium; usually they're caused by medical conditions that make us lose potassium, through diarrhoea, kidney failure or excessive sweating.
But that's not to say that eating enough wouldn't have benefits. Hundreds of years ago we had diets that were rich in potassium and we would consume about 200mmol a day. This study suggests that many don't eat the government's recommended 90mmol a day. Some countries, the USA and Canada included, advocate 120mmol a day. As the amount of processed food we eat has risen and we consume fewer fruits and vegetables, so the amount of potassium we eat has fallen.
The BMJ research, which specifically looked at the effects of potassium on heart disease and stroke, suggests that a higher intake of potassium could cut the risk of stroke by 24%.

Source  - Guardian