Dehydration 

Drying is often used as a method of preserving food.

In humans dehydration can be caused by a wide range of diseases and states that impair water homeostasis in the body.

Examples are :

• infectious diseases
  • yellow fever
  • cholera
  • Shigellosis
  • common gastrointestinal viral, bacterial infections resulting in vomiting and diarrhea

• external or stress related causes
  • Hyperthermia
  • shock
  • blood loss or hypotension[?] due to trauma
  • prolonged physical activity without consuming adequate water, especially in a hot environment

• dietary imbalances due to
  • nausea
  • restricted salt diets
  • excessive consumption of alcohol

• other causes of obligate water loss or electrolyte abnormalities
  • severe hyperglycemia in diabetes. Excretion of glucose with urine (glucosuria[?]) is accompanied with water loss. Water is the required solvent.

Symptoms may include headaches similar to what is experienced as a hangover, and lower blood pressure and a dizzy feeling when standing up which is called orthostatic hypotension. Extreme cases of dehydration can result in unconsciousness and death.

Correction of a dehydrated state is performed by rehydration[?], and the addition of necessary electrolytes.

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