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Water - Why It's Good To Drink 8 Glasses A Day

Jul 8, 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.

What happens if you don't drink enough water?

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. 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. gastro-intestinal upsets

3. nausea and loss of appetite

4. if it continues, muscular and emotional problems

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

Thirst

Under a great deal of physical activity it has been demonstrated that a man will only choose to drink half of the water intake needed to replace losses from sweat and urine. It takes a period of rest and a meal for the cravings for water to return to replace losses.

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.
About the Author
For an expanded version of this article please visit the alternative medicine website. Maria is a london nutritionist who specialises in the treatment of allergies. She has worked in the complementary health field for ten years.
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