well, urine should be clear, not foaming. That is perfect. If you are eating
something you cannot handle, it can spill over.  this happens with damage to
the kidneys or excess of sugar in the blood if you have diabetes. The kidneys
are filters they take out waste and keep in needed products. so with some
things there are thresholds. So that if you have too much sugar in the blood,
as with diabetes, the excess will spill over in the urine. The kidneys
shouldn't leak over protien unless they are damaged, but I do this sometimes,
but I had rheumatic fever as a kid, this does kidney damage. If I live very
well, never a problem, but if I ges sick  or live wrong, as in too high a
protien diet, I almost always have some foaming urine. Then again, I am not
dealing with a perfect system to begin with. It can be a sign of something. So
I didnt want to leave you with the impression that it was OK to ignor it. If
you are having this you might want to get a urinalysis run on it just to be
sure it is ok, when you are having it.

thanks

Jerry