Prolonged sitting may raise dementia risk, health experts warn

Dementia is often associated with early memory problems, but brain health over the years is also shaped by everyday habits — how active people are and how they care for their bodies. Researchers and healthcare specialists are increasingly examining the link between lifestyle and cognitive health.

Modern life — desk jobs, driving instead of walking, and evenings spent watching television — means a large part of the day can be spent sitting. Specialists point out that the human body is not built to stay in one position for hours, and this can affect not only the back and muscles but also metabolism and blood circulation.

Effect on blood sugar

Prolonged physical inactivity affects how the body uses glucose. A sedentary lifestyle may be linked to a higher risk of insulin resistance and type 2 diabetes, which in turn can raise blood sugar levels and damage blood vessels. Since brain cells require a constant supply of oxygen and nutrients, circulation problems can negatively affect brain function.

Effect on heart and blood vessels

Long periods of sitting are also linked to higher blood pressure, stroke risk, and other cardiovascular conditions, which are significant risk factors for vascular dementia. Specialists emphasize that what matters is not just occasional gym visits, but the total amount of movement throughout the day — even short active breaks between periods of sitting can help. Some studies have observed that people with sedentary lifestyles may have reduced volume in certain brain regions, including structures involved in memory and learning.