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Overall Brain Health Protects Memory From Early Alzheimer’s
Summary: A collaborative study reveals that maintaining robust overall brain health can protect memory and thinking skills from the early, destructive effects of Alzheimer’s disease.
Investigating why certain older adults remain cognitively sharp despite carrying early Alzheimer’s-related brain changes, researchers found that physical brain integrity acts as a powerful buffer. The findings highlight a critical window for targeted, preventative lifestyle strategies before noticeable cognitive decline or dementia sets in.
Key Facts
- The Pathological Paradox: Some older adults harbor early Alzheimer’s-related brain pathology but show absolutely no noticeable cognitive problems or memory impairment.
- Brain Health as a Shield: The primary finding indicates that maintaining good overall brain health significantly reduces the negative impact of early Alzheimer’s-related biological changes on cognitive function.
- Socioeconomic Influence: The study observed early evidence suggesting that individuals with a higher socioeconomic status (measured by education, income, savings, and financial security) may be less affected by early Alzheimer’s pathology when it comes to memory performance.
- The Clinical Cohort: Researchers analyzed data from more than 600 independently living older adults in the United States, aged 65 to 80, utilizing blood tests, MRI scans, and a rigorous battery of cognitive tests.
Source: Murdoch University
A healthy brain may help protect thinking and memory skills from the early effects of Alzheimer’s disease, a new study has found.
Dementia is currently the leading cause of death in Australia and Alzheimer’s disease is its most common form — accounting for more than 70% of cases.
Alzheimer’s is a progressive brain disease in which cognitive abilities gradually decline, leading to impaired memory and thinking skills.
However, some people maintain high levels of cognitive function even though their brains show early signs of the disease. Specifically, some older adults have Alzheimer’s‑related brain pathology, but no noticeable cognitive problems.
The study, Cognitive and Brain Reserve as Modifiers of Early Alzheimer Disease–Related Cognitive Vulnerability, was a collaboration between Murdoch University and AdventHealth, and investigated why some people remain cognitively healthy despite early Alzheimer’s‑related brain changes.
“Our study looked at why some brains were more resilient than others, and whether factors such as peoples’ education, socioeconomic status and health of their brain made a difference,” said lead author Dr Kelsey Sewell, from Murdoch University’s School of Allied Health.
“Understanding these protective factors could help us develop earlier and more targeted strategies to minimise the effects of the disease on memory and thinking skills,” she said.
The research team analysed data from more than 600 older adults in the United States aged 65 to 80, who were living independently and had no signs of dementia or memory impairment.
They used blood tests and MRI scans to assess early Alzheimer’s‑related changes and overall brain health, examined life and social factors such as years of education, income, savings and financial security, and conducted cognitive tests measuring memory, attention, processing speed, working memory and executive function.
“Our main finding was that maintaining good overall brain health may help reduce the impact of Alzheimer’s‑related changes on cognitive function,” Dr Sewell said.
“We also observed early evidence that people with a higher socioeconomic status may be less affected by Alzheimer’s-related changes when it comes to memory, although more research is needed to confirm this relationship.”
Dr Sewell said the main takeaway for the public was to do everything you can to maintain a healthy brain.
“Things like exercise, maintaining a healthy diet, sleeping well, and finding new cognitive challenges can help to maintain a healthy brain. It is never too late, or too early to start,” she said .
“These results underscore the need for coordinated action across research, policy, and industry to design environments that support healthier choices and promote brain health at a population level.”
The data collection for this study was led by researchers at AdventHealth in Orlando, Florida.
Key Questions Answered:
A: This is due to a phenomenon called brain and cognitive reserve. If a person preserves excellent overall brain structure and has built dense neural connections through an active lifestyle, their brain can effectively reroute signals. It works around the early pathological damage, keeping their memory and thinking skills completely intact on the surface.
A: The researchers emphasize that it is never too early or too late to build a resilient brain. The core pillars include engaging in regular physical exercise, maintaining a nutrient-rich healthy diet, ensuring consistent sleep hygiene, and routinely introducing novel, demanding cognitive challenges to keep your neural pathways flexible.
A: While more research is required to solidify the exact mechanics, higher socioeconomic status often correlates with lifelong access to better healthcare, lower chronic environmental stress, higher educational attainment, and more opportunities for cognitive enrichment. These factors combined help build a deeper neurological buffer against tissue degradation.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- Journal paper reviewed in full.
- Additional context added by our staff.
About this Alzheimer’s disease research news
Author: Ezra Kaye
Source: Murdoch University
Contact: Ezra Kaye – Murdoch University
Image: The image is credited to Neuroscience News
Original Research: Open access.
“Cognitive and Brain Reserve as Modifiers of Early Alzheimer Disease–Related Cognitive Vulnerability” by Kelsey R. Sewell, Patricio Solis-Urra, Haiqing Huang, Thomas K. Karikari, George Grove, Arthur F. Kramer, Edward McAuley, Jeffrey M. Burns, Charles H. Hillman, Eric D. Vidoni, Jill K. Morris, Anna L. Marsland, Chaeryon Kang, Bradley P. Sutton, Lu Wan, M. Ilyas Kamboh, Peter J. Gianaros, Jermon A. Drake, Yaakov Stern, Lauren E. Oberlin, and Kirk I. Erickson. Neurology
DOI:10.1212/WNL.0000000000214833
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