Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Dehydration ?
    ### Response:
    When you're dehydrated, your body doesn't have enough fluid to work properly. An average person on an average day needs about 3 quarts of water. But if you're out in the hot sun, you'll need a lot more than that. Most healthy bodies are very good at regulating water.
    