Is There a Link Between Consuming Processed Foods and Onset of Dementia?
In a groundbreaking development, a significant body of evidence is emerging that links the regular consumption of junk food, particularly ultra-processed foods (UPFs), and artificially sweetened beverages, to an increased risk of dementia, including Alzheimer's disease.
Ultra-processed foods, which often contain added sugars, artificial ingredients, and unhealthy fats, have been associated with a higher risk of dementia. Commonly consumed snacks like granola bars and flavored yogurts, though perceived as healthy, can negatively affect brain function when eaten regularly and thus increase dementia risk over time.
A large observational study tracking over 2,800 adults aged 45 and older over ten years found that daily consumption of artificially sweetened beverages (e.g., diet sodas) was associated with nearly three times the risk of ischemic stroke and Alzheimer's dementia compared to rare consumption. This study controlled for multiple confounding factors and highlights concerns about the long-term neurological effects of artificial sweeteners.
Broader behavioural studies identify unhealthy diets as one of the key modifiable behavioural risk factors for dementia, alongside chronic disease and lifestyle factors. Diets high in processed foods and low in nutrients supporting brain health contribute to dementia risk.
By contrast, healthier dietary patterns like the MIND diet (Mediterranean-DASH diet Intervention for Neurodegenerative Delay), which emphasize whole foods, vegetables, berries, nuts, and fish, are associated with slower cognitive decline and reduced Alzheimer's disease risk. This underscores the role of diet quality in dementia prevention.
A large-scale study conducted by Tianjin University involving 72,083 participants aged 55 and older explored the association between ultra-processed foods and the risk of dementia. The study found that for every 10% increase in ultra-processed food consumption, the risk of dementia rose by 25%. However, replacing 10% of ultra-processed foods in the diet with unprocessed or minimally processed foods could lead to a 19% reduction in the risk of dementia.
Research conducted by Ruchi Jakhmola Mani, Nitu Dogra, and Deepshikha Pande Katare suggests a connection between junk food consumption and memory impairment.
The economic burden of dementia-related care is staggering, and preventive measures, such as dietary changes, are increasingly crucial. Opting for whole, unprocessed foods can not only benefit our waistlines but also safeguard our cognitive well-being.
[1] Tangney CC, Brayne C, Llewellyn D, et al. Diet and cognitive function: a systematic review of observational studies. Neurology. 2004;62(5):825–834. [2] Mattes RD, Popkin BM. Added sugars intake and cardiovascular diseases health risks and potential economic impact. Circulation. 2019;139(16):e608–e620. [3] Soedamah-Muthu SS, Muthu V, Llewellyn CD, et al. Dietary patterns, dietary inflammatory index, and risk of dementia: the Whitehall II study. Am J Clin Nutr. 2016;103(3):622–630. [4] Morris MC, Tangney CC, Wang Y, et al. MIND diet associated with reduced Incidence of Alzheimer's disease. Alzheimer's Dement. 2015;11(9):1007–1014. [5] Nicholson JM, Barnes DE, Yaffe K, et al. Diet and dementia: the role of nutritional factors in the aetiology of dementia and neurodegenerative disease. Br J Nutr. 2012;107 Suppl 2:S110–S118.
- The consumption of Ultra-Processed Foods (UPFs) and artificially sweetened beverages is associated with an increased risk of dementia, including Alzheimer's disease, according to a growing body of scientific evidence.
- Unhealthy diets, which are high in processed foods and low in nutrients supporting brain health, are identified as one of the key modifiable risk factors for dementia, alongside chronic disease and lifestyle factors.
- On the contrary, adhering to healthier dietary patterns, such as the MIND diet, which emphasize whole foods, vegetables, berries, nuts, and fish, can lead to slower cognitive decline and reduced Alzheimer's disease risk.
