Very Low-Protein Diet (VLPD) Reduces Metabolic Acidosis in Subjects with Chronic Kidney Disease: The “Nutritional Light Signal” of the Renal Acid Load oleh Biagio Raffaele Di Iorio, Lucia Di Micco, Stefania Marzocco, Emanuele De Simone, Antonietta De Blasio, Maria Luisa Sirico, Luca Nardone, on behalf of UBI Study Group