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Why We Should Drink Eight Glasses Of Water Each Day

Jul 13, 2008
Normally, approximately 2.5 litres of water is required daily for a fairly sedentary adult in a normal environment to replace the total loss of water that occurs though urine, faeces, skin and lungs.

This water loss needs to be replaced. One litre or so needs to be as water or other non dehydrating fluids such as cold herbal teas. A little under a litre will come from food intake. The body also makes about 300ml through its own oxidative metabolic processes.

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. Numbness and tingling are experienced in the extremities

4. Increase in concentration of the blood

5. Reduced blood volume and more difficult circulation of the blood

The difficulty and problems of the blood circulation under such conditions 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 a scientific study involving animals, the restriction of water gave rise to irritabliity and for some, 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

Ingestion of hot drinks may cause internal body temperature to rise, which will result in sweating in order to cool the body down. Hot drinks are sometimes used in medical practice when it is desired either to temporarily increase body temperature of induce sweating. Therefore cold or cool drinks are preferred to hot drinks to replace fluid during the day, especially if the hot drinks are the only fluid daily intake.

Drinks containing sugar

During physical activities lasting less than 90 minutes, water is generally the beverage of choice, however, the inclusion of small concentrations of carbohydrate (6%-8% carbohydrate) have been shown to better sustain power output over water alone during physical activities that produce fatigue in 60 minutes or longer.
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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