Key points from article :
Diets of 921 people in US, average age of 81, observed for 6.1 years.
During the study, 220 participants, almost 24% developed Alzheimer's.
People who ate diets highest in flavonols had 40% lower chance of developing Alzheimer's.
Study adds weight to previous findings on benefits of healthy diet.
Limitations of the study include many unaccounted different health and lifestyle factors.
More work needs to be done, associations observed are promising and deserve further study.
Research by Rush University Medical Center and Tufts University, published in Neurology.
