Why doctors say to drink water

Water is very healthy and beneficial, i some areas you may be told to drink plenty of fluids while sick (common cold) this can replace the fluids you've lost and loosen mucus, together with keeping you hydrated.
 
water is also helps in lubricating bone joints, moisturizing skin, detoxing your body, it can help with headaches , it balances body fluids

Doctors say to drink water because its healthy and beneficial and if you want to loose weight on a hypocaloric diet drinking 500 ml of water 30 minutes before each meal three times a day helps you loose 44 percent.humans are 70 percent water, and our blood is 90 percent water and water is essential for the kidneys to función.

D. is the answer hope that you