"Miller says people with low levels of vitamin D experienced cognitive decline at a rate two to three times as fast as those with adequate levels of vitamin D."
"An international team found that study participants who were severely vitamin D deficient were more than twice as likely to develop dementia and Alzheimer's disease."
"patients with very low levels of vitamin D have about a 122% increased risk for dementia compared with those with higher levels, according to a large, prospective, population-based study."
"Long-term studies show that low vitamin D levels increase the risk of cognitive decline of any kind by 41 to 60%; increase the risk of Alzheimer’s dementia by 77%; and increase the risk of non-Alzheimer’s dementia by nearly 20-fold. And higher vitamin D concentrations are correlated with lower severity in Parkinson’s disease."
"it was once believed that brain cells (neurons) were produced only during a certain period of development, it's now known that neurogenesis (the growth of new brain cells) continues into adulthood.
" … It's thought that optimal vitamin D levels may protect brain cells by increasing the effectiveness of the glial cells in restoring damaged neurons.
In addition, vitamin D may be beneficial for brain health because it has anti-inflammatory and immune-boosting properties and has even been found to clear amyloid plaques in the brain, which is a hallmark of Alzheimer's disease.
Its neuroprotective effects are so strong that the risk of cognitive impairment was up to four times greater in elderly people with severe vitamin D deficiency compared to those with adequate levels."
researchers recently aimed to clarify the causal relationship between vitamin D and AD (Alzheimer's Disease) by conducting a Mendelian randomization study design. . . .
The researchers discovered that for every reduction in vitamin D status by one standard deviation (SD), the risk of AD increased by 25%.
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