Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Diabetes mellitus type 1 ?
    ### Response:
    Diabetes mellitus type 1 (DM1) is a condition in which cells in the pancreas (beta cells) stop producing insulin, causing abnormally high blood sugar levels. Lack of insulin results in the inability of the body to use glucose for energy and control the amount of sugar in the blood.
    