This loss is greater in very hot weather or in the performance
of strenuous exercise than under ordinary conditions, which accounts for
the fact that more than the usual amount of liquid must be supplied
during such times. So necessary is liquid refreshment that the body
cannot exist without it for any great length of time. In fact, if the
supply were cut off so that no more could be obtained, the body would
begin to use its own fluids and death would soon occur. A person can
live for many days without solid food, but it is not possible to live
for more than a very few days without drink.
2. Nature's way of serving notice that the body is in need of liquid
refreshment is through the sensation of thirst. Satisfying thirst not
only brings relief, but produces a decidedly pleasant sensation;
however, the real pleasure of drinking is not experienced until one has
become actually thirsty.
The various liquids by which thirst may be slaked, or quenched, are
known as _beverages_. The first one of these given to man was water,
and it is still the chief beverage, for it is used both alone and as a
foundation for numerous other beverages that are calculated to be more
tasty, but whose use is liable in some cases to lead to excessive
drinking or to the partaking of substances that are injurious to health.
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