A prospective cohort study following more than 1,000 older adults over 12 years found that regular egg consumers had a 47 percent lower incidence of Alzheimer's disease diagnosis compared to participants who rarely or never ate eggs. The researchers identified choline, lutein, and zeaxanthin as the most likely active compounds, building on previous laboratory research showing choline's role in acetylcholine synthesis and protection against amyloid plaque formation.
The findings generated significant public and clinical interest but also appropriate scientific caution. Observational studies of this design cannot establish causation because people who eat eggs regularly may differ from non-consumers in multiple other lifestyle factors that influence dementia risk. The research team is planning a randomized controlled trial of choline supplementation to test the hypothesis under conditions that can establish causal relationships.
