Medical and nutritional science emphasizes that no single food item can be singularly singled out as the sole cause of dementia, but health professionals strongly advise limiting or avoiding ultra-processed foods heavily laden with trans fats, added sugars, and refined carbohydrates. Diets high in industrially produced trans fats and sugary beverages are consistently linked in epidemiological studies to systemic inflammation, insulin resistance, impaired cerebrovascular health, and an accelerated decline in cognitive function over time. Major health organizations recommend replacing these detrimental dietary components with whole foods rich in antioxidants, omega-3 fatty acids, leafy greens, berries, and healthy fats typical of a balanced Mediterranean-style eating pattern. Minimizing the intake of heavily processed convenience items protects both metabolic and long-term neurological health.