May 14, 2021
Abstract
Introduction
Associations between diet, psychosocial stress, and neurodegenerative disease, including Alzheimer’s disease (AD), have been reported, but causal relationships are difficult to determine in human studies.
Methods
We used structural magnetic resonance imaging in a well‐validated non‐human primate model of AD‐like neuropathology to examine the longitudinal effects of diet (Mediterranean vs Western) and social subordination stress on brain anatomy, including global volumes, cortical thicknesses and volumes, and 20 individual regions of interest (ROIs).
Results
Western diet resulted in greater cortical thicknesses, total brain volumes, and gray matter, and diminished cerebrospinal fluid and white matter volumes. Socially stressed subordinates had smaller whole brain volumes but larger ROIs relevant to AD than dominants.
Discussion
The observation of increased size of AD‐related brain areas is consistent with similar reports of mid‐life volume increases predicting increased AD risk later in life. While the biological mechanisms underlying the findings require future investigation, these observations suggest that Western diet and psychosocial stress instigate pathologic changes that increase risk of AD‐associated neuropathology, whereas the Mediterranean diet may protect the brain.
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Author: Brett M. Frye,
Suzanne Craft,
Thomas C. Register,
Rachel N. Andrews,
Susan E. Appt,
Mara Z. Vitolins,
Beth Uberseder,
Marnie G. Silverstein‐Metzler,
Haiying Chen,
Christopher T. Whitlow,
Jeongchul Kim,
Richard A. Barcus,
Samuel N. Lockhart,
Siobhan Hoscheidt,
Brandon M. Say,
Sarah E. Corbitt,
Carol A. Shively
