Iron Deficiency Anaemia Could Heighten Dementia Risk, Study Finds
New research suggests that a nutrient deficiency impacting one in five people in the United Kingdom may significantly increase the risk of developing dementia and hasten the onset of symptoms. Iron deficiency anaemia, a common condition characterised by insufficient iron levels leading to reduced red blood cell production, has long been associated with health issues such as fatigue, headaches, and memory problems. In severe instances, untreated anaemia can even result in heart disease and kidney failure.
Link Between Low Iron and Dementia Uncovered
Researchers from Stockholm University have identified a concerning connection between iron deficiency and dementia. Their findings indicate that low iron reserves can diminish the brain's resilience to the disease, thereby elevating the risk of its development and accelerating symptoms, particularly in men. It is estimated that over 10 million Britons experience some degree of anaemia, which occurs when the blood lacks the necessary resources to transport adequate oxygen throughout the body, leading to symptoms like paleness, shortness of breath, and heart palpitations.
While iron deficiency anaemia can stem from an inadequate dietary intake of iron, it is also frequently caused by heavy menstrual periods and pregnancy in women. The new study, published in the journal JAMA Neurology, monitored 2,282 cognitively healthy adults aged 60 and above for approximately nine years, examining how fluctuations in iron levels influenced their risk of Alzheimer's disease.
Key Findings from the Research
Blood samples collected at the study's outset were analysed for levels of tau, a protein that accumulates and forms tangles in the brain. Significant clumps of this toxic protein can create plaques, which are believed to underlie the symptoms of Alzheimer's. Additionally, the samples were tested for haemoglobin levels, a protein in red blood cells responsible for oxygen transport and used to diagnose anaemia.
The research revealed that men and women with anaemia were 66 percent more likely to develop the memory-robbing disease compared to those with normal haemoglobin levels. Low haemoglobin was also correlated with higher levels of p-tau217, considered the most specific blood marker for Alzheimer's. Interestingly, anaemia was associated with a greater dementia risk in men than in women, despite women being more commonly affected by iron deficiency anaemia.
Sex-Specific Vulnerabilities Explored
The researchers proposed that this disparity might reflect a sex-specific vulnerability to low haemoglobin levels. They noted that while females often have lower haemoglobin levels and higher anaemia prevalence in early life due to reproductive factors, anaemia in males is less common, occurs later, and is frequently driven by chronic disease, inflammation, or nutritional deficiencies. The authors suggested that females' generally lower baseline haemoglobin levels might confer greater tolerance to anaemia, potentially buffering its impact on brain health.
In their conclusion, the researchers stated: "Our findings suggest anaemia is a clinically relevant factor in the context of dementia risk and is possibly a modifiable target in dementia prevention strategies."
Global and UK Impact of Iron Deficiency
Latest figures indicate that around two billion people worldwide have iron deficiency, with 1.2 billion suffering from iron-deficiency anaemia, primarily due to poor diet. In the UK alone, it is estimated that three percent of men and eight percent of women have the condition, resulting in more than 57,000 hospital admissions annually due to anaemia.
Experts emphasise that the majority of cases are preventable. For many individuals, a daily iron supplement, costing just 10p per pill, can sufficiently boost iron levels. Additionally, consuming more dark leafy vegetables like kale, cereals fortified with extra iron, and red meat can help enhance iron intake.
Lifestyle Factors and Dementia Prevention
Lifestyle and environmental factors also play a significant role in influencing dementia risk. Smoking, poor cardiovascular health, and social isolation are all known to increase the likelihood of developing the memory-robbing condition. Alzheimer's disease, the most common form of dementia, affects up to 75 percent of those diagnosed, with early symptoms typically including memory problems, difficulties with thinking and reasoning, and language issues that worsen over time.
However, experts believe that approximately 45 percent of dementia cases may be preventable or at least delayed through lifestyle interventions and improved screening measures.
