FGF23 and chronic kidney disease: The P content in the diet had a clear impact on the basal levels of plasma FGF23 in CKD rats with higher concentrations in PNX HP rats (p < 0.0001) and lower in PNX LP rats (p < 0.01) as compared with control rats at all time points (Fig. 3a), except PNX LP vs control at 02:00—corresponding to the lowest value measured in control rats.