I have started my own diet based on googling the web to reduce my creatinine Level.
There is so much info, some of course conflicts, what is good or not for the kidneys.

http://www.kidney-treatment.org/creatinine/541.html

It's a start, but the beef that I like to consume, is off my diet. (at least for now)

Above - is the poached salmon my son made, poached with a side of sautéed onions. (yummy!)

Later...
Fish Tilapia tacos at the 'Perk'