Studies about vitamin D and cognitive performance:

Effect of Vitamin D Replacement on Cognition in Multiple Sclerosis Patients (2017)

Conclusion: Three months of high-dose vitamin D3 supplementation (10,000 IU / day) was found to be effective in improving memory in multiple sclerosis patients.

 

Does High Dose Vitamin D Supplementation Enhance Cognition? A Randomized Trial in Healthy Adults (2017)

Conclusion: Supplementing with 4,000 IU of vitamin D3 a day was found to be effective for improving non-verbal memory in adults – especially in deficient subjects.

 

Association of Metabolic Syndrome and 25-Hydroxyvitamin D with Cognitive Impairment Among Elderly Koreans (2016)

Conclusion: In a study of 2,940 elderly Koreans, those suffering from cognitive impairment had lower vitamin D levels compared to those with higher vitamin D levels.

 

Vitamin D Insufficiency and Cognitive Impairment in Asians: A Multi-Ethnic Population-Based Study and Meta-Analysis (2016)

Conclusion: In a study of 2,273 elderly Singaporean Asians, those with higher vitamin D levels achieved better scores on cognitive tests compared to those with lower vitamin D levels.

 

A Study of Cognitive Functions in Female Elderly Patients with Osteoporosis: A Multi-Center Cross-Sectional Study (2016)

Conclusion: In a study of 277 postmenopausal women, those with osteoporosis were found to have worse cognitive function. Osteoporosis is a symptom of long-term vitamin D deficiency.

 

Serum 25-Hydroxyvitamin D Predicts Cognitive Performance in Adults (2015)

Conclusion: In a study of 254 Lebanese adults in the Beirut area, those with higher vitamin D levels performed better on cognitive performance tests compared to those with lower vitamin D levels.

 

Higher Serum 25-Hydroxyvitamin D and Lower Plasma Glucose Are Associated with Larger Gray Matter Volume but Not with White Matter or Total Brain Volume in Dutch Community-Dwelling Older Adults (2015)

Conclusion: A study of 217 elderly Dutch people found that those with higher vitamin D levels also had higher grey matter volume in their brains.

 

Vitamin D and Cognitive Function: The Tromsø Study (2015)

Conclusion: In a Norwegian cross-sectional study of thousands of people, those with higher vitamin D levels were found to have better cognitive function compared to those with lower vitamin D levels.

 

Vitamin D Deficiency Disrupts Neuronal Integrity in Cognitively Impaired Patients (2015)

Conclusion: In a study of 109 memory-impaired patients, those with higher vitamin D levels were found to have better neuronal integrity.

 

Vitamin D Prevents Cognitive Decline and Enhances Hippocampal Synaptic Function in Aging Rats (2014)

Conclusion: Rats given higher doses of vitamin D performed better in cognitive tests compared to rats given lower doses of vitamin D.

 

Serum 25-Hydroxyvitamin D and Cognitive Decline: A Longitudinal Study Among Non-Demented Older Adults (2014)

Conclusion: A multi-year study of 527 non-demented elderly people found that those with lower vitamin D levels also demonstrated worse cognitive function compared to those with higher vitamin D levels.

 

Relationship Between 25-Hydroxyvitamin D and Cognitive Function in Older Adults: The Health, Aging and Body Composition Study (2014)

Conclusion: In a 4-year study of 2,777 elderly people found that those with lower vitamin D levels had worse cognitive function and experienced a greater decline in cognitive function over the 4 years compared to those with higher vitamin D levels.

 

Vitamin D and the Risk of Dementia and Alzheimer Disease (2014)

Conclusion: In an 8-year study of 1,658 elderly people, there was an increased rate of alzheimer’s disease and dementia among those with lower vitamin D levels compared to those with higher vitamin D levels.

 

Vitamin D Deficiency, Cognitive Impairment and Dementia: A Systematic Review and Meta-Analysis (2012)

Conclusion: “Meta-analysis of 5 cross-sectional and 2 longitudinal studies comprising 7,688 participants showed an increased risk of cognitive impairment in those with low vitamin D compared with normal vitamin D”

 

Vitamin D and Cognitive Impairment in the Elderly U.S. Population (2011)

Conclusion: A study of 3,325 elderly Americans found that those with lower vitamin D levels performed worse on cognitive tests compared to those with higher vitamin D levels.

 

Is Vitamin D Important for Preserving Cognition? A Positive Correlation of Serum 25-Hydroxyvitamin D Concentration with Cognitive Function. (2007)

Conclusion: This study of 32 elderly people found that those with higher vitamin D levels performed better on a cognitive test than those with lower levels.

 

Vitamin D Deficiency is Associated with Low Mood and Worse Cognitive Performance in Older Adults (2006)

Conclusion: A study of 80 older adults found that 58% had inadequate vitamin D levels and those with lower levels had worse scores on depression and cognitive function tests.

 

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