FGF23 and chronic kidney disease: The same research group, also after a randomized, crossover controlled trial [including 32 CKD patients not yet on dialysis (21 men; mean age of 66 y)], described that one week of a VLPD (0.30 g of protein/kg of body weight/day, 66% vegetable protein), supplemented with a mixture of essential amino acids and keto-analogues of non-essential amino acids (versus an LPD with 0.60 g of protein/kg of body weight/day, 48% vegetable protein), reduced circulating FGF23 and both circulating and urinary phosphate [77].