Almost 1,000 people were studied over 10 years
Morris's team studied almost 1,000 people, all between the ages of 58 and 99 who didn't have dementia. They enrolled participants in the Memory and Aging Project, which is a 1979 project at the Knight Alzheimer's Disease Research Center at Washington University. Subjects were asked to answer questionnaires, detailing their diet habits over 5 years. Researchers wanted to know how often people ate spinach, salad, kale, or other greens. To try to correlate eating habits with memory issues, they also looked at memory tests and thinking evaluations to measure cognitive function in their study population.