Homocysteine and cognitive function in depression: a systematic review and meta-analysis
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By
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Xiaotong Liu
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Qingsong Liu
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Jili Xu
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Jie Wu
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May 13, 2026
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Clinical Scorecard: The Relationship Between Homocysteine Levels and Cognitive Function in Depressed Patients: A Systematic Review and Meta-Analysis
At a Glance
| Category | Detail |
| Condition | Depression with cognitive impairment |
| Key Mechanisms | Association of elevated homocysteine levels with cognitive deficits through neurotoxic effects and oxidative stress. |
| Target Population | Patients with depression |
| Care Setting | Clinical and research settings |
Key Highlights
- Significant inverse association between homocysteine levels and cognitive scores (r = −0.41).
- High homocysteine levels correlate with poorer cognitive performance (SMD = −0.37).
- Patients with cognitive impairment have higher homocysteine levels than cognitively normal individuals (SMD = 2.44).
- Further prospective studies are needed to clarify the clinical relevance of homocysteine.
- Dysregulation of one-carbon metabolism may affect cognitive function in depression.
Guideline-Based Recommendations
Diagnosis
- Assess homocysteine levels in patients with depression to evaluate cognitive impairment.
Management
- Consider monitoring homocysteine levels as part of the management plan for depressed patients with cognitive deficits.
Monitoring & Follow-up
- Regularly evaluate cognitive function in patients with elevated homocysteine levels.
Risks
- Higher homocysteine levels may increase the risk of cognitive decline and dementia.
Patient & Prescribing Data
Individuals diagnosed with depression experiencing cognitive impairment.
Addressing elevated homocysteine levels may be beneficial in managing cognitive deficits in depression.
Clinical Best Practices
- Utilize validated instruments for diagnosing depression and assessing cognitive function.
- Incorporate dietary and lifestyle interventions that may lower homocysteine levels.
- Encourage further research into the relationship between homocysteine and cognitive function in depression.
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