[riprowan]

Let's assume that's the consumption needed to optimize the functioning of the renal system. But is that necessarily optimal consumption for the whole body?

With no offense to your sister - who I'm sure is correct - hypothetically, maybe this could result in some other condition that a urologist might know nothing about.

[donald123]

Unless someone can prove that consumption is harmful for the whole body, what's wrong with that to optimize the renal system at least?

[riprowan]

It's just systems theory. The optimized whole is not equal to the sum of the optimized parts.