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Folate, homocysteine, and neurological function
1Nutritional Epidemiology Program, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, 711 Washington Street, 9th Floor, Boston, MA 02111, USA. Morris@HNRC.Tufts.edu
Summary
Low folate status is linked to depression and increased homocysteine, a risk factor for stroke and Alzheimer's disease (AD). Folate supplementation may reduce the risk of age-related neurological dysfunction.
Area of Science:
- Neurology
- Nutritional Neuroscience
- Gerontology
Background:
- Low folate status is associated with depression and elevated homocysteine levels.
- Elevated homocysteine is an independent risk factor for stroke.
- Emerging evidence suggests a link between cerebrovascular disease, Alzheimer's disease (AD), and senile dementia, potentially involving shared pathogenic factors.
Purpose of the Study:
- To explore the interrelationships among folate, homocysteine, and neurological function, particularly in conditions like depression, stroke, and Alzheimer's disease (AD).
- To investigate the hypothesis that common pathogenic factors, involving folate or homocysteine, underlie the observed connection between stroke and AD.
- To assess the potential of folate supplementation in mitigating the risk of age-related neuropsychiatric dysfunction.
Main Methods:
- Review of existing literature on folate, homocysteine, and neurological disorders.
- Analysis of epidemiological data and clinical studies investigating the roles of folate and homocysteine in depression, stroke, and AD.
- Exploration of the biochemical pathways linking folate metabolism and homocysteine levels to neurological health.
Main Results:
- Low folate status is a suspected risk factor for depression.
- Increased homocysteine levels are linked to depression and are an independent risk factor for stroke.
- A potential common pathogenic link involving folate and/or homocysteine is hypothesized for the co-occurrence of vascular brain disease and Alzheimer's disease (AD).
Conclusions:
- While a direct causal relationship between neurological dysfunction and folate/homocysteine levels remains to be fully elucidated, the findings support an association.
- Improving folate status can lower homocysteine levels.
- Folate supplementation warrants further intensive research as a potential strategy to reduce the risk of age-related neuropsychiatric conditions, including depression, stroke, and dementia.