Similarly, in a different prospective study in cats with naturally occurring CKD, dietary phosphorus restriction in conjunction with the use of phosphorus binders when needed, led to a significant increase in survival time (633 versus 264 days).148 In contrast to the previous study,147 cats fed a phosphorus-restricted diet had significantly lower phosphorus (5.7 versus 6.3 mg/dL) and plasma PTH concentrations (86 versus 216 pg/mL) at mid-survival time point.148. Here, PTH is linked to chronic kidney disease.