K/Na metabolism is tricky. Both are fundamental but in a very different way (Na levels are higher and with more tolerance in fluctuations, hypo/hyper-K can easi

K/Na metabolism is tricky. Both are fundamental but in a very different way (Na levels are higher and with more tolerance in fluctuations, hypo/hyper-K can easily stop the heart). The pressumed effect of K in BP is mainly that K pushes Na outside of renal tubules in an 1:1 analogy, which could be better achieved by not consuming Na in the first place. In practice for a healthy adult below a certain age K intake is healthy (as it is contained in healthy foods) but otherwise risks arise. Certainly blind suggestion to the public is not warranted and K substitutes are used ONLY on demand (hypo-K, diarrhea etc)