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Folate and Alzheimer: when time matters.
Margareta Hinterberger1, Peter Fischer
1Ludwig Boltzmann Institute of Aging Research, Langobardenstraße 122, 1220, Vienna, Austria. margareta.hinterberger@utanet.at
Summary
Folate deficiency is linked to Alzheimer's dementia (AD) and cognitive decline. While B vitamin supplementation shows cognitive benefits, especially for those with high homocysteine, its impact on dementia prevention remains debated.
Area of Science:
- Neuroscience
- Nutritional Science
- Genetics
Background:
- Folate is crucial for DNA integrity and methylation processes.
- Folate deficiency is associated with neural tube defects and cognitive decline, including Alzheimer's dementia (AD).
- Folate deficiency can induce AD pathomechanisms such as oxidative stress and amyloid-beta accumulation.
Purpose of the Study:
- To review the link between folate deficiency and AD.
- To analyze epidemiological studies and randomized controlled trials (RCTs) on B vitamin supplementation and cognitive function.
- To explore reasons for the controversy surrounding folic acid's impact on dementia.
Main Methods:
- Analysis of epidemiological studies with observation periods of at least 4 years.
- Review of randomized controlled trials (RCTs) with intervention periods of at least 2 years.
- Examination of studies focusing on folate, B12, and homocysteine levels in relation to cognitive health.
Main Results:
- Six out of seven RCTs reported cognitive benefits from B vitamin supplementation, particularly in individuals with baseline high homocysteine or low folate.
- Controversies in literature may stem from short follow-up periods, subject heterogeneity, and unrepresentative baseline nutrient levels.
- Long-term, population-based studies starting in mid-adulthood are needed to clarify folate's role in AD prevention.
Conclusions:
- Folate deficiency is a significant risk factor for cognitive decline and Alzheimer's dementia.
- B vitamin supplementation may offer cognitive benefits, but its role in dementia prevention requires further investigation.
- Future research, including mandatory folate fortification programs, is essential to understand folate's long-term impact on AD incidence.
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