High blood pressure (also called hypertension) is a main risk factor for cardiovascular disease. I have found a detailed, controlled study that shows that the consumption of large quantities of potassium in foods is a very powerful tool to diminish blood pressure: http://www.news-medical.net/news/2009/01/27/45282.aspx http://www.healthcentral.com/high-blood-pressure/lifestyle-161415-5.html
This would explain the excellent cardio health in societies that consume large amounts of potassium containing foods, such as sweet potatoes, bananas or lentils, such as the Okinawas or Cretan traditional diets. It would also explain why an omnivore diet, with lots of vegetables and fruits plus meat and fish is healthier than a zero carb diet. Do you agree?
I think the problem is that it is complicated. Many things have been implicated in high blood pressure, anything from nutrient intake to plaque buildup in the arteries. Nutrients like calcium and magnesium have also seemed to help control high blood pressure and so does exercise. Levels of one nutrient influence levels of others as well as needs for levels of others, such that it all becomes such a big tangled web of confusion that they haven't yet sorted it out. Here is an article on potassium that touches on some of that: http://www.webmd.com/a-to-z-guides/potassium-k-in-blood
For myself, I feel that decent levels of potassium intake may be good and are probably not bad so I try to eat decent amounts. But I think it's far too soon to assume that lowering of blood pressure via high intake of potassium might directly influence cardiovascular risk to a large degree. Higher blood pressure may be correlated with heart attack risk due to a lot of hbp problems being causes by plaque buildup. But if you get your blood pressure down via manipulating potassium and salt intake, but the plaque is all still there and building, then this may turn out to do nothing whatsoever to improve your cardiovascular health. Because high blood pressure could just be a mostly symptom of plaque buildup and cardiac probs, but it may not be the actual cause. In order to truly solve a problem you have to get down to the root of it and I don't think we know for sure the root of it yet, although inflammation may well be a strong contender at this point.
Also, I see no study citations in the original cited article, so I am not sure how we know that any studies were 'detailed' or even particularly relevent. To me, it is not enough for them to just say 'studies show' while giving not references at all. So I am not monstrously impressed with the article as major scientific evidence of anything. That article is enough to portray a basic idea ot the public. However, I think the jury is still out on if eating more veggies and fruits will automatically cause more good then harm just because they have potassium in them. They also have sugar, which could lead to increased inflammation and exacerbate many with already existing blood sugar issues, which could cause more problems than the potassium solves. And studies I have seen comparing actual real life fruit and veggie intake with health issues have NOT been able to find any obvious benefit to eating more fruits and veggies.
One of the dangers of having a preexisting theory is that one tends to cast around and only notice data that fits that theory. This is why epidemiological studies are such a dangerous tool to use. Okinawans are different from americans in millions of ways so the number of uncontrolled variables are astronomical. But I would like to point out that there are a number of groups that eat little or no fruits and veggies but still have healthier cardiovascular conditions. If it were all about potassium by itself, this would not be the case.
It would also explain why an omnivore diet, with lots of vegetables and fruits plus meat and fish is healthier than a zero carb diet.
Since I don't believe an omnivorous diet is healthier than a zero carb diet, it doesn't explain anything.
Moreover a low carbohydrate diet is known to lower pathologically high blood pressure.
Browsing through the web, I found that Loren Cordain considers the ratio of potassium to sodium as one of the main factors in Western disease " Sodium-potassium ratio
The average sodium content (3271 mg/d) of the typical US diet is substantially higher than its potassium content (2620 mg/d) (23). Three dietary factors are primarily responsible for the dietary ratio of sodium to potassium, which is >1.0. First, 90% of the sodium in Western diets comes from manufactured salt (sodium chloride); hence, the sodium content of naturally occurring foods in the average US diet (330 mg) is quite low. Second, vegetable oils and refined sugars, which are essentially devoid of potassium, constitute 36% of the total food energy. The inclusion of these 2 foods into the diet displaces other foods with higher potassium concentrations and thereby reduces the total dietary potassium content. Third, the displacement of vegetables and fruit by whole grains and milk products may further reduce the potassium intake because potassium concentrations in vegetables are 4 and 12 times those in milk and whole grains, respectively, whereas in fruit the potassium concentration is 2 and 5 times that in milk and whole grains (64). Taken together, the addition of manufactured salt to the food supply and the displacement of traditional potassium-rich foods by foods introduced during the Neolithic and Industrial periods caused a 400% decline in the potassium intake while simultaneously initiating a 400% increase in sodium ingestion (4, 12, 159). The inversion of potassium and sodium concentrations in hominin diets had no evolutionary precedent and now plays an integral role in eliciting and contributing to numerous diseases of civilization. Diets low in potassium and high in sodium may partially or directly underlie or exacerbate a variety of maladies and chronic illnesses, including hypertension, stroke, kidney stones, osteoporosis, gastrointestinal tract cancers, asthma, exercise-induced asthma, insomnia, air sickness, high-altitude sickness, and Meniere’s Syndrome (ear ringing) (160-170)."