Ryan,
Over-the-counter potassium is not that dangerous, though prescription potassium can be (which is why it's a "prescription"). The caveat is that potassium is dangerous for folks with kidney disease. Whether healthy or ill, the dose makes the poison. Potassium in over-the-counter pill form is limited to 99mg per pill. That's not dangerous for ordinary folks. Food gives you so much more than that (and is the preferred method of increasing potassium).
A good point, however, is that -- according to Sebastian, et al. (2006) -- most everyone is actually walking around with at least a subclinical potassium deficiency. We've steadily deprived ourselves of something which was much more abundant when our genes were formed. That's what's dangerous.
The medical community says we have something called "essential" hypertension, but there's nothing essential about it. It's not a universal hypertension-with-age, for instance, it only happens in countries where folks eat lower potassium. That's not to say that potassium would cure all (or even most) cases of hypertension, but it's at least a fifth of the story. Another way to say that is that it's always important (no matter what you read in somebody's -- or some Body's -- "Executive Summary").
Here's how to get the 4700mg a day that we're supposed to (K+ is the chemical symbol for potassium):
....
K+
subtotal
Sweetpotato, 1 potato
694
694
Beet greens, cooked, ½ cup ..... 655
1349
Yogurt, plain. Low-fat, 8 oz
... 531
1880
Tuna, cooked, 3 oz ...
. 484
2364
Banana, 1 medium
.
422
2786
Spinach, cooked, ½ cup
419
3205
Tomato juice, Ύ cup
.
. 417
3622
Pork chop, cooked, 3 oz
... 382
4004
Cantaloupe, Ό medium
.
. 368
4372
Split peas, cooked, ½ cup
. 355
4727
That's a lot of munchin'! Other food sources of potassium are probably worse. The 10 foods above are good sources of potassium.
:-)
Ed
Reference: http://www.health.gov/dietaryguidelines/dga2005/document/html/executivesummary.htm
http://www.health.gov/dietaryguidelines/dga2005/document/html/appendixB.htm
[abstract] Sebastian A, et al. (2006). The evolution-informed optimal dietary potassium intake of human beings greatly exceeds current and recommended intakes. Semin Nephrol. Nov;26(6):447-53. Retrieved from Pubmed on: 29 Jan 2009. PMID#: 17275582
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