| Purpose – This paper aims to depict the mechanistic role of vitamin D on dementia prevention, relief of the
severity and the complication of the disease. All papers indexed in scientific databases, including Scopus,
Elsevier, PubMed, Embase and Google Scholar between 2000 and 2021 were extracted and discussed. To
present the mechanistic role of vitamin D in declining the severity of dementia, keywords including dementia,
vitamin D, oxidative stress, inflammation, amyloid beta-Peptides were used.
Design/methodology/approach – Dementia is a prevalent cognitive disorder worldwide, especially in
elderly people, which is accompanied by serious disabilities. Besides genetic, biological and lifestyle factors
are involved in the incidence of dementia. An unhealthy diet along with micronutrient deficiencies are among
modifiable factors. Vitamin D is one of the important micronutrients in brain health. Besides the involvement
in gene expression, bone mineralization, apoptosis, inflammation, skeletal maturation, neurotropic action and
hemostasis of phosphate and calcium, vitamin D also exerts neuroprotective effects via genomic and nongenomic pathways.
Findings – Vitamin D up-regulates the expression of various genes involved in dementia incidence via
various mechanisms. Decreasing oxidative stress and the neuro-inflammatory cytokines levels, regulation of
the expression of alternated Proteins including Tau and Amyloid-ß, calcium homeostasis in the central
nervous system and also vascular are considered main mechanisms.
Originality/value – Considering the importance of diet in preventing dementia, adherence to a healthy diet
that provides essential nutrients to brain function seems to be urgent. Controlling serum levels of vitamin D
periodically and providing vitamin D by related sources or supplements, if there is a deficiency, is
recommended. Future studies are needed to clarify other related mechanisms. |