When visiting long-term care facilities, the presence of residents in their 50s and 60s is increasingly common. While many assume dementia is exclusively a condition of the elderly, this is a dangerous misconception. As vascular diseases have proliferated due to shifting dietary patterns and lifestyle factors, the number of individuals experiencing cognitive decline as a complication has risen sharply. Because these patients often lose the ability to manage daily life independently, the burden of caregiving frequently falls on their families. The question remains: why is the age of onset trending younger?
10% of dementia patients under 65: "That many?"
Dementia is no longer a disease reserved for the elderly. In South Korea, the number of patients aged 64 and under has surpassed 80,000, accounting for approximately 10% of the total dementia population, according to 2023 data from the Central Dementia Center. Any case developing before the age of 65 is classified as "early-onset dementia," whether the underlying cause is Alzheimer’s disease or vascular issues. Experts point to changes in dietary habits as a primary driver behind this steady increase in younger patients.
The rapid surge of vascular dementia and damaged blood vessels
While there are hundreds of causes for cognitive decline, Alzheimer’s disease accounts for roughly 65–70% of cases. However, vascular dementia is rising rapidly. This trend is closely linked to the increasing prevalence of high blood pressure, high cholesterol, diabetes, and obesity—all of which damage the circulatory system. When diabetes makes the blood more viscous and impairs vessel integrity, the brain’s delicate microvasculature is significantly impacted. Beyond these metabolic factors, other contributors to cognitive decline include frequent alcohol consumption, smoking, depression, chronic inflammation, hearing loss, air pollution, sleep disorders, social isolation, and physical inactivity.
Prioritizing metabolic health for prevention
Preventing dementia requires a disciplined focus on managing blood pressure, cholesterol, and blood sugar levels. Essential lifestyle adjustments include securing adequate sleep, treating depression, quitting smoking, and strictly limiting alcohol intake. Postmenopausal women are at a particularly high risk for vascular disease; as estrogen levels—which naturally protect blood vessels—decline, the risk of stroke or cerebral hemorrhage increases. Even if a patient survives such an event, vascular dementia often follows as a long-term complication. Ultimately, vascular health is the most critical line of defense for the brain.
Nutritional protection: Apples, onions, and traditional diets
Incorporating brain-healthy foods into a daily diet can offer significant protection. Onions, apples, kale, mallow, broccoli, and green tea are rich in quercetin, a compound known for supporting vascular integrity. It is also advisable to reduce the intake of high-calorie, high-fat, and refined carbohydrate foods in favor of mixed grains and legumes. Unsaturated "good fats" found in nuts, olive oil, perilla oil, and sesame oil further support healthy circulation. Three decades ago, when the Korean diet centered on seasoned vegetables, vascular dementia was relatively rare. Returning to those traditional plant-based meals—while being mindful of salt intake—remains one of the most effective ways to safeguard cognitive health.
