Dementia is a significant health concern associated with aging, but developing the condition is not inevitable, according to GP Dr. Amir Khan. Evidence suggests that addressing modifiable risk factors throughout life could prevent or delay nearly half of all dementia cases. These insights are drawn from the 2024 Lancet Commission on dementia prevention, intervention, and care.
Dr. Khan emphasized that while age and genetics are factors, numerous lifestyle choices can protect brain health. The Lancet Commission identified 14 potentially modifiable risk factors that, if managed, could theoretically prevent or delay approximately 45 percent of dementia cases at a population level. Some of these protective habits can be incorporated as early as a person's 30s.
Physical Activity
Regular exercise is a fundamental step. Physical inactivity is a recognized risk factor, and consistent exercise benefits the cardiovascular system, blood vessels, and metabolic health, all of which are crucial for the brain. Dr. Khan recommends aiming for 150 minutes of moderate activity weekly, incorporating some strength training. Brisk walks, dancing, or any form of movement count towards this goal. This is particularly important for individuals with sedentary jobs, encouraging the integration of activity into daily routines, such as walking instead of driving or engaging in enjoyable activities.
Cardiovascular Health Management
Brain health and heart health are closely linked. Managing conditions and risk factors like high blood pressure, diabetes, and obesity is vital for reducing dementia risk. The 2024 Lancet Commission also added high LDL cholesterol in midlife to its list of modifiable risk factors. Dr. Khan advises individuals, particularly from their 40s onwards, to be aware of their blood pressure, cholesterol levels, and diabetes risk.
Hearing and Social Connection
Ignoring hearing loss is another significant factor. Hearing loss in midlife has been identified as a modifiable dementia risk factor. Dr. Khan suggests that the association may stem from the increased cognitive effort required to process sound or from social withdrawal due to hearing difficulties. He advises protecting ears from excessive noise and seeking medical attention for any changes in hearing.
Maintaining an active social life and engaging in mentally stimulating activities also play a crucial role. Social isolation is linked to an increased risk of dementia, while mental and social engagement is associated with lower rates. Simple activities like reading, practicing handwriting, learning a new skill, pursuing a hobby, volunteering, or joining groups can contribute to cognitive health. Maintaining friendships, even through casual meetups like having coffee, is also beneficial.
Head Injury Prevention
Finally, Dr. Khan stressed the importance of taking head injuries seriously throughout life. Wearing helmets during activities like cycling and properly managing concussions are advised. As individuals age, maintaining muscle strength and balance can help reduce the likelihood of falls and subsequent head injuries.
While these measures do not guarantee prevention, they offer a hopeful approach to brain health that extends beyond age and genetics, with many benefits that positively impact overall well-being.