Below is an instruction from Human. Write a response.
    ### Instruction:
    How many people are affected by African iron overload ?
    ### Response:
    African iron overload is common in rural areas of central and southern Africa; up to 10 percent of the population in these regions may be affected. Men seem to be affected more often than women, possibly due to some combination of differences in dietary iron consumption and gender differences in the processing of iron.
    