Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) familial hypobetalipoproteinemia ?
    ### Response:
    Familial hypobetalipoproteinemia (FHBL) is a disorder that impairs the body's ability to absorb and transport fats. This condition is characterized by low levels of a fat-like substance called cholesterol in the blood. The severity of signs and symptoms experienced by people with FHBL vary widely.
    