Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Hypoglycemia ?
    ### Response:
    Hypoglycemia means low blood glucose, or blood sugar. Your body needs glucose to have enough energy. After you eat, your blood absorbs glucose. If you eat more sugar than your body needs, your muscles, and liver store the extra. When your blood sugar begins to fall, a hormone tells your liver to release glucose.
    