Uremia is a disease of catabolism (breaking down of tissues)
  with
  evidence of (tissue) weight loss and malnutrition. Dialysis
  and
  transplant reverse this when they work well. For HD the URR
  should be
  above 65% (Kt/v >1.4) and with further study may turn out
  to be higher.
  Those who are well dialyzed should have the appetite to eat
  well enough
  to return toward their pre-illness real weight. Poor
  appetite and real
  weight loss must always be signs of great concern to the
  nephrologist
  since, if not due to underdialysis, they indicate another
  severe illness
  is lurking and should be searched for. 
Peter Lundin 
  
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