R’ Elyashiv, R’ Chaim Kanievskey, and many other (perhaps ALL other) Gedolim Pasken that while certainly not a Chiyuv, kidney donation is not only Mutar but a tremendous Mitzvah of giving life to another. And to second what the Mod said, I have not, in my somewhat extensive research, come across any recommended lifestyle restrictions other than a prudent suggestion to refrain from contact sports lest one lose his only kidney. Exercise, drinking more, etc. I have never heard of as recommended after kidney donation – sounds like plain old general advice to me (and in the case of drinking more than one needs to quench his thirst, not necessarily good advice). The remaining kidney grows larger and does the exact same job that two once did.
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