Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) short-chain acyl-CoA dehydrogenase deficiency ?
    ### Response:
    Short-chain acyl-CoA dehydrogenase (SCAD) deficiency is a condition that prevents the body from converting certain fats into energy, especially during periods without food (fasting).  Signs and symptoms of SCAD deficiency may appear during infancy or early childhood and can include vomiting, low blood sugar (hypoglycemia), a lack of energy (lethargy), poor feeding, and failure to gain weight and grow at the expected rate (failure to thrive).
    