A small study of patients with diagnosed CKD (mean eGFR 32 mL/min/1.73 m2) demonstrated that after one week of the dietary intervention (consumption of vegetarian- vs. meat-based diets with equivalent contents of protein and phosphates) the vegetarian diet resulted in lower serum levels of phosphorus and FGF-23 compared to meat-based diet [119]. The gene discussed is FGF23; the disease is chronic kidney disease.