On figuring dietary balance that actually makes the urine more acidic, rather than just being a simplified score, it would be quite complex. It can’t be solved simply from amounts of protein and minerals, as PRAL tries to do.
The score talked about with regards to these diets is based only on protein, phosphorus §, potassium (K), calcium (Ca), and magnesium (Mg) and the form doesn’t matter. For example, potassium chloride and magnesium citrate would count as alkalinizing though they are not.
So this is why, for example, grains are counted as “acid-forming.” They provide P in good amounts but little Mg, Ca, or K.
A good read on the general subject is this: http://images.yoli.com/BritJournalArticle.pdf
Generally they don’t ever wind up finding proof or conclusions on importance of reaching any “acid” or “alkaline” value in the diet, but find importance in the individual nutrients that are consumed.
It’s good to get suitable amounts of calcium, magnesium, and potassium! Absolutely! Very much recommended.
I would look at it that way, rather than summing everything up into a PRAL score, or other “acid” or “alkaline” summary.
And it’s good to get enough phosphorus, regardless that PRAL counts it as a bad thing. One of the often-overlooked things about dieting is that sometimes P intake falls too low. Just as an aside.
So far as I know, it’s never been shown that when the above intakes are good and are controlled to be essentially the same in either case, that any disadvantage is found with substantial protein intake. There are studies showing lower bone mass in women with protein intake from meat vs from other sources, or total protein intake, which have correlation between the protein intake and reduced bone mass, but these other things are not constant, particularly phosphorus to calcium ratio.
The body is really, really good at keeping blood pH constant at rest, pretty much regardless of diet, unless having disease. What can vary in response to diet is urinary pH, but evidence seems to be lacking that in and of itself that’s much if anything of a predictor of anything for a healthy person.
But increasing greens intake? Getting a good amount of magnesium? Getting a good amount of potassium?
All great ideas, but not necessarily if at all for the reason of the pH of the urine! Or at least that is my view; I haven’t seen where it’s been shown otherwise, though it’s often claimed otherwise.