Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Diverticular Disease ?
    ### Response:
    Scientists are not certain what causes diverticulosis and diverticular disease. For more than 50 years, the most widely accepted theory was that a low-fiber diet led to diverticulosis and diverticular disease. Diverticulosis and diverticular disease were first noticed in the United States in the early 1900s, around the time processed foods were introduced into the American diet.
    