NPPA and Hypervolemia: Postabsorptive signals also include the renin–angiotensin–aldosterone hormonal system which promotes water and salt intake under conditions of hypovolemia (Fitzsimons 1998) and atrial natriuretic peptide (ANP), which is released from cardiac atrial myocytes under conditions of hypervolemia and can inhibit fluid intake after pharmacological injection, suggesting a role in fluid satiation (Antunes‐Rodrigues et al.