Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose What I need to know about Gestational Diabetes ?
    ### Response:
    Your health care team may teach you how to test for chemicals called ketones in your morning urine or in your blood. High levels of ketones are a sign that your body is using your body fat for energy instead of the food you eat. Using fat for energy is not recommended during pregnancy.
    