What signal is sent to your kidneys if you drink a lot of water?

When you drink a lot of water, your blood volume increases, leading to a decrease in the concentration of solutes like sodium in the blood. This change is detected by the kidneys, which respond by reducing the secretion of the hormone aldosterone and increasing the production of urine to help maintain fluid balance. Additionally, the increased blood volume triggers the release of atrial natriuretic peptide (ANP), which further promotes urine production and sodium excretion.