The role of egg-derived nutrients in Alzheimer's disease: Exploring potential benefits and biological insights

Abstract

This review investigates the potential link between egg consumption and Alzheimer's disease (AD) through a nutritional lens, focusing on key nutrients found in eggs such as choline, docosahexaenoic acid (DHA), and tryptophan (TRP). Eggs are recognized for their high-quality protein content and are rich in nutrients essential for brain health. Notably, national health guidelines have shifted away from considering eggs as a risk factor for hypercholesterolemia and cardiovascular disease, largely due to the complex relationship between dietary cholesterol and blood cholesterol levels. Although eggs are a significant source of dietary cholesterol, recent studies suggest that the cholesterol in eggs does not substantially raise blood cholesterol levels or increase the risk of heart disease. This review also explores how nutrients like choline, DHA, and TRP in eggs contribute to cognitive health and may help reduce the risk of age-related cognitive decline, including AD. While the direct connection between egg consumption and AD is not fully established, the neuroprotective roles of these nutrients highlight the importance of further research. Additionally, this review addresses common misconceptions about egg cholesterol, emphasizing the importance of eggs as part of a balanced diet for maintaining brain health and potentially mitigating the risk of neurodegenerative diseases.