Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Hereditary fructose intolerance ?
    ### Response:
    What causes hereditary fructose intolerance (HFI)? HFI is caused by alterations (mutations) in the ALDOB gene. This gene provides instructions for making an enzyme called aldolase B. This enzyme is primarily found in the liver and is involved in the breakdown of fructose into energy.
    