This gut-kidney axis is the biggest thing I've learned. Paying attention to the pee bubbles is big, too. If you're forming kidney stones, it depends on what they're made of, but most commonly they're made of oxalates, so certain vegetables should be avoided - spinach is a major no-no for me. Also start walking a lot, if you're not already - walking is the best thing for lowering blood pressure, and I think most kidney problems are caused by high blood pressure. And about BP, its tempting to cut salt and then think you're doing something - that's a trap. Like, yeah, don't eat too much, but too low salt can have the same effect as too much. Always make sure your pee is light colored, like lighter than lemonade, and that the bubbles pop quickly - thats about protein leakage, which weakened kidneys will leak. Avoid pills that damage kidneys - magnesium supplements are damaging, and pain killers (I always forget which, but one common pain killer kills kidneys and the other kills liver - always sacrifice the liver, since it can heal, whereas kidneys are much less likely to ever heal, though I think its possible). Hmm, what else... Smaller meals are better than larger meals because larger meals cause more work for kidneys. And its possible to calculate your maximum protein intake based on % remaining functionality, though I haven't bothered yet.
Well... Yeah.
On the bright side, learning all this can be fun.
