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Why We Should Drink Eight Glasses Of Water Each Day

By: Maria Esposito


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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).

Problems that arise from not drinking enough water is as follows.

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

2. Increase in respiration

3. Experience numbness and tingling in the fingers and toes

4. Blood concentration increases

5. Diminution of blood volume and more difficult circulation

Problems and inadequacies of the circulatory system under conditions of inadequate fluid intake leads to:

1. breathing problems

2. gastrointestinal upsets

3. nauseousness 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 trial, restricted water intake led to irritablitiy and in some cases, bad temper.

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

Drinking hot liquids can cause a rise in internal body temperature. The body will sweat to bring the temperature down. In medical practice this is sometimes used as a deliberate ploy to temporarily raise body temperature or induce the body to sweat. So cool or cold liquids are preferred to hot ones to replace fluid losses. This is especially the case if hot drinks are always the preferred choice rather than cold ones.

Drinks containing sugar

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.

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For an expanded version of this article please go to the alternative medicine website. Maria is a london nutritionist who specialises in the treatment of allergic disorders. She has worked in the complementary medical field for ten years.



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