A landmark study found that Catholic nuns who wrote sparse, simple autobiographies in their early twenties, when they entered the convent in the 1930s, were far more likely to develop Alzheimer's disease roughly six decades later, with about 80 percent of the low-complexity writers eventually developing the disease compared to only 10 percent of those whose youthful essays were dense with ideas
A nun's youthful writing style in the 1930s predicted her risk of Alzheimer's six decades later—suggesting cognitive complexity in youth may shield the brain from decline.