Feeding a HP diet resulted in higher FGF23 levels than feeding NP diet and rats fed HP-HF diet also had significantly (p < 0.01) elevated FGF23, 995 ± 120 pg/ml, when compared with rats fed HP-NF diet, 547 ± 40 pg/ml (Fig. 1). Here, FGF23 is linked to hydrops fetalis.