Here’s some studies about vitamin D, bright light, and dementia:

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.


Light Therapy and Alzheimer’s Disease and Related Dementia: Past, Present, and Future (2012)

Conclusion: Overview of the research showing how bright light therapy has been found to be effective for improving behavior and quality of life in elderly people with dementia.


Vitamin D, Cognition, and Dementia: A Systematic Review and Meta-Analysis (2012)

Conclusion: Meta-analysis of 8 different studies evaluating vitamin D levels, cognitive function, and mental health. The researchers found that those with lower vitamin D levels had worse cognitive function and a higher incidence of Alzheimer disease.


Serum Vitamin D Deficiency as a Predictor of Incident Non-Alzheimer Dementias: A 7-Year Longitudinal Study (2011)

Conclusion: Forty healthy elderly women were divided into two groups based on their vitamin D levels, a lower vitamin D level group and a higher vitamin D level group. The women were followed up with 7 years later and screen for non-Alzheimer dementia. The women who had lower vitamin D levels at the beginning of the study 7 years prior had a higher incidence rate of non-Alzheimer dementia. “Baseline vitamin D deficiency predicted the onset of NAD within 7 years among older women.”


Vitamin D and Neurocognitive Dysfunction: Preventing “D”ecline? (2008)

Note: This article provides an overview of how vitamin D plays a role in brain health during old age and can help prevent dementia and alzheimer’s.


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

Conclusion: 40 elderly people with alzheimer’s disease and 40 non-demented elderly people who were participating in studies at the Alzheimer’s Disease Research Center were evaluated. Their vitamin D levels, physical performance, and cognitive/mental health were measured with a variety of mental health tests. The vitamin D results were not good. The average level of the entire group was only 18.5 ng/ml and 58% had “abnormally low” vitamin D levels. Those who were vitamin D-deficient were found to have a higher prevalence of mood disorders and scored worse on the Short Blessed Test (SBT) and the Clinical Dementia Rating test (CRD).


The Effects of Light Therapy on Mini-Mental State Examination Scores in Demented Patients (2001)

Conclusion: Bright light therapy is an effective treatment for improving cognitive performance in people with dementia.


Effects of Bright Light on Cognitive and Sleep–Wake (Circadian) Rhythm Disturbances in Alzheimer-Type Dementia (2000)

Conclusion: This study found bright light therapy to be an effective treatment for improving the circadian rhythm and cognitive performance in elderly dementia patients.


Randomized, DIM Light Controlled, Crossover Test of Morning Bright Light Therapy for Rest-Activity Rhythm Disorders in Patients with Vascular Dementia and Dementia of Alzheimer’s Type (1998)

Conclusion: This study found that bright light therapy improved sleep and the sleep/wake cycle of elderly dementia patients.


Bone Density, Vitamin D Nutrition, and Parathyroid Hormone Levels in Women with Dementia (1995)

Conclusion: This study compared the vitamin D levels of 20 elderly women with dementia to 40 cognitively normal age-matched control women. The women with dementia had “significantly” lower vitamin D levels.


Morning Bright Light Therapy for Sleep and Behavior Disorders in Elderly Patients with Dementia (1994)

Conclusion: Morning bright light therapy was shown to be effective for improving sleep and behavior disorders in demented elderly patients. (You know… like SUNLIGHT)


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