Water is the perfect medium for body processes because it enables chemical reactions to occur.
Water temperature changes slowly because it has a great ability to hold heat. It takes much more energy to heat water than it does to heat fat.
When overheated, the body secretes fluids in the form of perspiration, which evaporates through skin pores. To evaporate water, heat energy is required. So, as perspiration evaporates, heat energy is taken from the skin, cooling it in the process.
Water is an important vehicle for transporting substances throughout the body and for removing waste products from the body. Most unusable substances in the body can dissolve in water and exit the body through the urine.
Water helps form the lubricants found in knees and other joints of the body. It is the basis for saliva, bile, and amniotic fluid.
We consume water in various liquids, such as fruit juice, coffee, tea, soft drinks, and water itself. Note that coffee, tea, and soft drinks often contain caffeine, which increases urine output. However, the fluid consumed from these beverages is not completely lost in urine, so these fluids still help to meet water needs. Foods also supply water; many fruits and vegetables are more than 80% water.
If you don’t drink enough water, your body eventually lets you know by signaling thirst. Your brain is communicating the need to drink. Once the body registers a shortage of available water, it increases fluid conservation. The kidneys respond by reducing urine flow. Lack of water can lead to dehydration, a condition that occurs when you don't have enough water in the body to carry out normal functions. Even mild dehydration can drain your energy and make you tired.
Consuming too much water can also lead to ill health, especially if concentrations of blood electrolytes, notably sodium, become too low. When excessive water intake overwhelms the kidneys’ capacity to excrete fluid, blurred vision is one resulting symptom.
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