The reabsorption of water back into the blood (at the medulla) is controlled by the anti-diuretic hormone (ADH). ADH is produced by the part of the brain that monitors water levels in the blood.

These diagrams show what happens when there is either too little or too much water in the blood.

With this condition, the pituitary gland and kidneys fail to work together to keep water in the body. "Normally, our pituitary glands produce a hormone called anti-diuretic hormone (AVP) that sends a ...

Two mechanisms have been proposed as causes: syndrome of inappropriate anti-diuretic hormone and cerebral salt wasting. Physical examination and laboratory results can assist a clinician in ...

Mr King said: "While some research on caffeinated drinks may suggest that the fluid in caffeinated drinks balances out the water lost because of the diuretic effect, it's always safer to be cautious .