Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) maple syrup urine disease ?
    ### Response:
    Maple syrup urine disease is an inherited disorder in which the body is unable to process certain protein building blocks (amino acids) properly. The condition gets its name from the distinctive sweet odor of affected infants' urine and is also characterized by poor feeding, vomiting, lack of energy (lethargy), and developmental delay.
    