Table 2.

Blood and urine measurements after 1 week of diet as outpatient

Before Meat (casein) DietAfter Meat (casein) DietBefore Vegetarian (grain) DietAfter Vegetarian (grain) DietP (paired t test)a
Average daily phosphorus intake (mg/day)810 ± 27795 ± 51NS
Plasma phosphorus (mg/dl)3.5 ± 0.63.7 ± 0.63.5 ± 0.63.2 ± 0.50.02
Plasma intact PTH (pg/ml)58 ± 3146 ± 2958 ± 3956 ± 300.002
Plasma FGF23 (pg/ml)72 ± 39101 ± 8384 ± 6561 ± 350.008
Plasma calcium (mg/dl)9.2 ± 0.49.4 ± 0.79.3 ± 0.49.1 ± 0.3NS
Creatinine clearance (ml/min)47 ± 1647 ± 1643 ± 1144 ± 16NS
Urine 24-hour calcium excretion (mg/24 h)66 ± 6977 ± 4860 ± 5971 ± 43NS
Urine 24-hour phosphorus excretion (mg/24 h)836 ± 187583 ± 216778 ± 190416 ± 2330.07
Urine 24-hour FePhosph (%)38.0 ± 6.223.9 ± 5.138.2 ± 11.520.9 ± 9.9NS
  • a By paired t test comparing results at end (after) each 7-day controlled diet study period drawn at the same time (8:00 p.m.). Results are mean ± SD. The before values are shown to demonstrate what the patients ate on their own during the before-study and washout periods and to demonstrate no carryover effect.