Question

What's the benefits of water to a sick person

Answer 1

They need to be moist to have optimal operation—efficient operation—to protect you from getting ill.” Drinkingnon-sugary fluids helps your body maintain an adequate production of mucus. Asking people to increase their fluid intake, however, has little to do with "healing" a cold or flu
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Answer 2

water helps clear your body of toxins. Drinking water can also help clear away some types of illnesses by lessening congestion in your body. Additionally, water helps your mocous membranes work, so they can trap things like dust and bacteria and prevent them from getting into your lungs.