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Nutritional factors, cognitive decline, and dementia
Angelo Del Parigi1, Francesco Panza, Cristiano Capurso
1National Institutes of Health, National Institute of Diabetes and Digestive and Kidney Diseases, Obesity and Diabetes Clinical Research Section, 4212N 16 Street, Phoenix, AZ 85016, USA. angelo.delparigi@pfizer.com
Brain Research Bulletin
|February 9, 2006
Summary
Nutritional deficiencies can impact cognitive function, but the relationship is complex. More research is needed to confirm if diet causes cognitive decline or vice versa.
Area of Science:
- Nutrition Science
- Neuroscience
- Epidemiology
Background:
- Nutritional factors and deficiencies are linked to cognitive impairment, but causality is unclear.
- Cognitive impairment can influence dietary habits, leading to nutritional deficiencies.
Purpose of the Study:
- To review existing clinical and epidemiological studies on the association between nutrition and cognitive function.
- To identify potential nutritional determinants of cognitive decline and dementia.
Main Methods:
- Systematic review of clinical and epidemiological studies published between January 1983 and June 2004.
- Analysis of associations between dietary intake of antioxidants, B vitamins, macronutrients, and cognitive outcomes.
Main Results:
- Antioxidants and poly-/mono-unsaturated fatty acids show potential protective roles against cognitive decline and Alzheimer's disease (AD), though findings are inconsistent.
- Deficiencies in B vitamins, particularly folate (B9) and cobalamin (B12), are associated with cognitive dysfunction and hyperhomocysteinemia.
- Limited studies exist on macronutrient intake, with fatty acids and cholesterol receiving attention.
Conclusions:
- The relationship between nutrition and cognitive impairment is complex, with bidirectional influences.
- Further well-designed intervention studies are necessary to establish specific nutrient recommendations for cognitive health.
- Clarifying the role of specific micronutrient and macronutrient deficiencies is crucial for public health guidelines.