According to research on Catholic nuns, what factor reduces the incidence of Alzheimer's disease?

Question

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Research on Catholic nuns has shown that a high level of education is linked to a reduced incidence of Alzheimer's disease. This could be due to factors such as increased cognitive stimulation or better brain development in childhood. Spirituality, acceptance of authority, and diet have not been consistently linked to a reduced incidence of Alzheimer's disease in this population.

According to Research on Catholic Nuns, What Factor Reduces the Incidence