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Major link discovered between common stomach bacteria and Alzheimer's Disease

Recent research has shed light on a potential link between a common stomach bacterium, Helicobacter pylori (H. pylori), and an increased risk of Alzheimer's disease. (CREDIT: Creative Commons)

Alzheimer's disease (AD), the most prevalent form of dementia, affects approximately 40 million people worldwide, with projections suggesting a significant increase in the coming decades.

Despite the immense impact of this devastating disease, effective treatment options have remained elusive. However, recent research has shed light on a potential link between a common stomach bacterium, Helicobacter pylori (H. pylori), and an increased risk of Alzheimer's disease.


This discovery, made by a team of researchers at McGill University, opens doors for further investigation into the role of infections in Alzheimer's development and the possibility of preventive strategies.

The Helicobacter pylori Connection

H. pylori, a bacterium found in the stomachs of approximately two-thirds of the world's population, has long been associated with various gastrointestinal issues, including indigestion, gastritis, ulcers, and even stomach cancer. However, recent studies have raised concerns about its potential involvement in Alzheimer's disease.

The groundbreaking research, published in Alzheimer's & Dementia: The Journal of the Alzheimer's Association, aimed to investigate whether clinically apparent H. pylori infections were linked to an elevated risk of Alzheimer's disease, particularly in individuals aged 50 and older.


Dr. Paul Brassard, the senior author of the study and a Professor in McGill's Department of Medicine, expressed the importance of this investigation, emphasizing the urgent need for effective strategies to combat Alzheimer's disease, given the anticipated surge in dementia cases due to global population aging.

To unravel the potential connection between H. pylori and Alzheimer's disease, the research team analyzed health data from over 4 million individuals aged 50 and above in the United Kingdom. The data spanned the years from 1988 to 2019, allowing for a comprehensive examination of the relationship between H. pylori infections and Alzheimer's risk.


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The results of this extensive study were compelling. Individuals with symptomatic H. pylori infections were found to have an 11% higher risk of developing Alzheimer's disease, the most common form of dementia. While Alzheimer's disease's exact cause remains multifaceted and complex, these findings added to the mounting body of evidence suggesting that infections, particularly H. pylori, may play a significant role in its development.

The implications of this research are far-reaching. As the global population continues to age, the prevalence of dementia, including Alzheimer's disease, is expected to triple in the next 40 years. Dr. Brassard noted that there is a pressing need for effective treatment options and preventive strategies to address this looming healthcare crisis.


He emphasized the potential role of H. pylori in dementia and its significance in informing the development of prevention strategies. Dr. Brassard highlighted the possibility of individualized eradication programs to reduce H. pylori infections at the population level. This could be a critical step in the fight against Alzheimer's disease.

Future Research Directions

The study at McGill University has paved the way for future research endeavors. Investigating the role of H. pylori in Alzheimer's disease is just the beginning. Researchers are now poised to explore several key areas:

Understanding Mechanisms: Scientists will delve deeper into the mechanisms by which H. pylori may contribute to Alzheimer's disease. Identifying the specific pathways involved could lead to targeted treatments or preventive measures.


Eradication Programs: As mentioned by Dr. Brassard, the development of individualized eradication programs to reduce H. pylori infections could prove vital. These programs may involve screening and treating individuals with H. pylori infections, especially in older age groups.

Helicobacter pylori (H. pylori) infection increased the risk of Alzheimer's disease in people aged 50 and older. (CREDIT: Creative Commons)

Population-Level Interventions: The broader implications of this research extend to public health interventions. Governments and healthcare organizations may need to consider widespread efforts to reduce H. pylori infections, potentially impacting Alzheimer's disease rates on a population level.


Early Detection: Detecting H. pylori infections early in life and monitoring their long-term effects on brain health may offer valuable insights into Alzheimer's risk. This could lead to more proactive approaches to Alzheimer's prevention.

Time-response analysis for the association between CAHPI and the risk of incident Alzheimer's disease. CAHPI, clinical apparent Helicobacter pylori infection; CI, confidence interval; OR, odds ratio. (CREDIT: Alzheimer's & Dementia: The Journal of the Alzheimer's Association)

Treatment Strategies: Researchers will explore whether eradicating H. pylori infections in individuals with a high risk of Alzheimer's disease could effectively reduce their likelihood of developing the condition. This could be a groundbreaking avenue for intervention.


Dr. Brassard summed up the study's importance best when he said, "We hope the findings from this investigation will provide insight on the potential role of H. pylori in dementia in order to inform the development of prevention strategies, such as individualized eradication programs, to reduce infections at the population level."

With continued research and dedication, the fight against Alzheimer's disease may one day gain a powerful ally in the form of a common stomach bacterium.

For more science news stories check out our New Discoveries section at The Brighter Side of News.


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