Question

why doctor advise us to drink at least 2 liters daily

Answer 1

our body requires water. it helps to carry out many chemical processes in the body.However it is not necessary that you drink only 2litres a day. the amount should be according to the climatic conditions. for eg- right now in summers we should at least drink 4-5 litres of water every day. it restores all the water from the body that is lost due to perspiration.

Answer 2

Water cushions our joints, keeps our eyes and mouth moist, helps us swallow, allows us to absorb nutrients, and helps get rid of waste. On top of that it helps regulate our temperature.
So we should drink at least 2 liters of water daily.