While scientists continue their efforts to find a cure for Alzheimer's disease, the exact causes of the disease are still not fully understood. It is believed that there is a genetic predisposition, especially if symptoms first appear before the age of 65.
Despite intensive scientific efforts to find an effective treatment for Alzheimer's disease, the exact causes behind it remain largely unknown. However, researchers agree that the disease results from a complex interaction of genetic, environmental, and lifestyle factors.
Age: The most powerful factor
Aging is the most significant risk factor. After age 65, the risk of developing Alzheimer's disease increases significantly due to the natural changes that occur in brain cells with age.
Genetic predisposition: is it written in the genes?
Genetic factors play a significant role, especially in cases that appear before age 65 (known as early-onset Alzheimer's). Mutations in genes such as PSEN1 and PSEN2 significantly increase the risk of developing the disease. Having a first-degree relative (such as a parent or sibling) with the disease also increases an individual's risk.
Heart Health = Brain Health
It may seem surprising, but cardiovascular disease is closely linked to Alzheimer's disease. High blood pressure, diabetes, and atherosclerosis not only threaten the heart, but also impair blood flow to the brain, accelerating nerve cell damage and increasing the risk of neurodegeneration.
Lifestyle: Your decisions today shape your brain tomorrow.
Daily habits play a crucial role. Smoking, excessive alcohol consumption, and lack of physical activity are all risk factors. Severe head injuries—such as those resulting from accidents or repeated concussions—may also trigger the disease's later onset.
Education Level: An Unexpected Brain Shield
One of the most unexpected things you might think of is that education may be a preventative measure! Studies have shown that people with a low level of education (less than a high school diploma) are more than twice as likely to develop dementia. In fact, research in the UK found that each additional year of schooling reduces the risk of Alzheimer's by 1.4 percent. The reason? It's believed that a trained brain—through education and mental challenges—builds what's called "cognitive reserve," a more resilient neural network capable of compensating for early damage caused by the disease before symptoms appear.
However, the picture isn't entirely clear. Some studies, such as one from Japan that included nearly 2,000 people aged 40 to 79, found no strong relationship between education and cognitive decline, suggesting that the picture is more complex than we think.
What's going on inside the brain?
In Alzheimer's disease, abnormal deposits of amyloid protein accumulate outside nerve cells, disrupting communication between them. Over time, the cells responsible for memory, thinking, and learning are damaged, and mental function begins to gradually decline.
Alarming numbers:
A silent epidemic is on the rise. According to the World Health Organization, more than 55 million people worldwide currently suffer from dementia, most of them over the age of 65, and approximately 10 million new cases are diagnosed each year. With global life expectancy increasing, this number is expected to rise to 78 million by 2030 and 139 million by 2050.
Chronic stress: a hidden enemy of the brain
Another surprising factor is chronic psychological stress. When stressed, the body releases hormones such as adrenaline and cortisol. While this response is beneficial in the short term, prolonged elevated cortisol levels can damage the brain, particularly the hippocampus and prefrontal cortex — the centers of memory and logical thinking.
Chronic inflammation and oxidative stress (build-up of free radicals) also contribute to brain cell damage and disrupt neural communication.
How do we protect ourselves?
Although there is no cure yet, the risk can be reduced through effective preventative steps: Regular exercise to improve blood flow to the brain; Managing stress through techniques such as meditation, mindfulness, or deep breathing; Maintaining active social relationships, as social support provides a psychological and neurological buffer; Following a healthy diet (such as the Mediterranean diet); and Constantly stimulating the brain through reading, learning, and mental games.
Alzheimer's disease isn't just "getting old." It's a complex neurological condition that begins years before symptoms appear. The good news is that much of what we do today—from our lifestyle to our mental health—can make a real difference in protecting our brains tomorrow.
