Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Primary carnitine deficiency ?
    ### Response:
    Primary carnitine deficiency is a genetic condition that prevents the body from using certain fats for energy, particularly during periods without food (fasting). The nature and severity of signs and symptoms may vary, but they most often appear during infancy or early childhood and can include severe brain dysfunction (encephalopathy), cardiomyopathy, confusion, vomiting, muscle weakness, and hypoglycemia.
    