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Water - Why We Need To Drink 8 Glasses A Day

Jul 12, 2008
Usually about two and a half litres of water is needed each day for a reasonably sedentary adult to replace the total water loss that occurs through skin, lungs, faeces and urine, unless they are in an unusual environment.

To replace the water loss about 1 to 1.2 litres needs to be in drinks, (mainly water or cold herbal teas), 0.9 ml is taken though food and 0.3ml will be made by the body (oxidative metabolism).

If you don't drink enough water, this is what happens.

1. The pulse rate goes up and there is an increase in the rectal temperature

2. Respiration increases

3. Tingling and numbness of fingers and feet

4. Increase in blood concentration

5. Diminution of blood volume and more difficult circulation

The difficulty and problems of the blood circulation under such conditions leads to:

1. breathing difficulties

2. gastrointestinal upsets

3. nausea and loss of appetite

4. if it carries on for an extended period it will cause problems with muscle movement and unstable emotions

In an animal study, where water was restricted the animals were highly irritable and in some cases bad tempered.

Thirst

It has been demonstrated that under intense physical activity a male will only drink voluntarily around 50% as much water as what is required to replace losses from urine and sweat. Only after rest and food do the cravings for the required amount of water return to replace the fluid deficit.

Hot Drinks

After drinking hot liquids, the internal temperature of the body rises, resulting in sweating. This cools the body down. This is sometimes used in the practice of medicine when an increase in body temperature is required for a short time, or whether sweating is required. So it is preferable to choose cool or cold drinks rather than hot ones to replace fluid losses, particularly if hot drinks are the only types of drinks that are normally chosen.

Sugar drinks

Water is the preferred choice of liquid for physical activities that last less than 90 minutes. For activities that would create fatigue after an hour or so, drinks that contain some carbohydrate are better for sustaining power output than water alone.
About the Author
Maria has worked in alternative medicine as a nutritionalist and reflexologist. She is qualified in therapeutic massage and sports injuries. Her speciality is the treatment of allergies. She can be contacted at london nutritionist
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