FGF23 and chronic kidney disease: In a crossover trial, Moe and colleagues compared the effects of isocaloric vegetarian and meat diets on phosphorus metabolism in 9 CKD (stage 3–4) patients [46], showing a significant reduction in serum phosphorus and FGF-23 levels and a decreased urinary 24-h phosphorus excretion in the vegetarian diet group compared to the meat-diet group.