A new study suggests that a dietary shift as simple as adding eggs to your regular meals could meaningfully reduce the risk of Alzheimer's disease in older adults.
Researchers at Loma Linda University Health examined nearly 40,000 participants over an average of 15 years and found that people who consumed at least one egg daily, five or more days per week, showed a 27% lower risk of Alzheimer's diagnosis compared to those who never ate eggs. Even modest egg consumption produced measurable benefits. Those who ate eggs just one to three times monthly experienced a 17% risk reduction, while eating them two to four times weekly was associated with about a 20% lower risk.
The findings were published in the Journal of Nutrition and focused on adults age 65 and older, tracking both direct egg consumption and eggs present in baked goods and packaged foods. Joan Sabaté, the study's principal investigator and a professor at Loma Linda University School of Public Health, emphasized that the protective effect became clearer as consumption increased.
Eggs pack several compounds that appear to work in the brain's favor. They are loaded with choline, which the body converts into acetylcholine and phosphatidylcholine, both critical for memory formation and neural communication. Egg yolks also deliver lutein and zeaxanthin, carotenoids that accumulate in brain tissue and have been tied to sharper cognitive performance and reduced oxidative stress. Additionally, eggs contain omega-3 fatty acids and phospholipids, which make up nearly 30% of total egg lipids and play central roles in how neurotransmitter receptors function.
The study used Medicare records to identify Alzheimer's diagnoses among participants in the Adventist Health Study 2 cohort, one of the longest-running nutritional epidemiology projects in the United States. Researchers accessed claims data through Medicare Master Beneficiary Summary Files to confirm diagnoses, providing a robust method for tracking disease incidence.
Jisoo Oh, the study's lead author and an associate professor of epidemiology at Loma Linda, cautioned against viewing eggs as a standalone solution. The research team underscored that eggs work best within the context of an overall healthy eating pattern, noting that Seventh-day Adventists, the population studied, tend to follow healthier diets than the general public.
The American Egg Board provided partial funding for the research, while the National Institutes of Health supported the original cohort establishment and data collection. The findings add to a growing body of evidence exploring how everyday dietary choices might influence brain health in later life, particularly for a disease that affects millions worldwide.
Author Jessica Williams: "One egg a day is cheap, accessible, and already sitting in most American refrigerators, which makes this research far more actionable than waiting for the next pharmaceutical breakthrough."
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