Actually, even if the dark color is like a bright YELLOW, it IS probably ok. Basically, the yellow is urea, and almost anything can drive it up. Take too much protein, vitamin B, etc... and it will get darker. Heck, I never would have thought anyone would care as much as I have seen lately And stated goals on the other type of waste have varied QUITE a bit! If urine is ANOTHER color, then you should worry. Orange could be anything from a minor irritant, to a first sign of major damage. A browner color could mean you have a REALLY big case of "Rhabdomyolysis", or any of several other problems. I don't know if Rob experienced that, but I have heard of it. If your urine is EVEN a light brown, I would say go to a GP or a urologist. It COULD be a minor infection, but it COULD mean a MAJOR problem. Most minor problems would likely go away in a couple days.
That said, dying muscle, like Rhabdomyolysis DOES drive protein up(The protein from the dead muscle has to go SOMEWHERE) and do the same thing. But frankly Rob YOU had the problem because you pushed yourself SO hard. From what I can see, beefcake isn't pushing that hard.
From what I have heard, about .75 ounces of water per pound per day is FINE. If you figure beefcake weighs maybe 66KG, IIRC, that is 145Lbs, which is 109oz, or about 14 8oz glasses of water. BTW that is about 3.25liters a day. Obviously, you COULD figure 49.25ml per KG.
BTW compared to the traditional one size fits all of 8 8oz glasses of water today, the estimates I give here are HIGH! 8 8oz glasses are only enough for someone weighing about 39KG, or someone a bit more than half of beefcakes size! The average 11yo girl weighs more than that! They are certainly low enough to be safe, and I don't think anyone would be afraid of them being too low.
Don't feel that you are going to suffer kidney damage, or whatever, if you can tell your urine is yellow.
BTW about the other type of waste. I will only say one thing that is definitely true here. If it is PALE, WATCH OUT! The possible problems tend to be BAD. At the VERY least, you should get a general metabolic rundown. A simple urine or, preferably, blood test. It is cheap, and your bilirubin would likely be high.
BTW where was the way females think brought up? I realize beercake is female, but I haven't seen any indication of any hidden or nuanced meaning. I would certainly like to learn that language though.
Steve