(great post here)
Back before dialysis, I tried to stay off as long as possible by following guidelines in the book by Mackensie Walser, limiting my protein intake to no more than 50g/day, taking some amino acid supplements, and slowly losing muscle mass. I ended up malnourished and anemic. My GFR was 6 when I finally started dialysis, I'm 6'3", and I weighed 156 lbs. Today, I'm at a trim 175 lbs, have enough energy to work and still do a few things otherwise. I can ride my bikes, mow the lawn, chop wood, and a lot of other things that I couldn't do during that last year before dialysis started.