The Study
VITAMIN D DEFICIENCY AS A MODERN MEDICAL AND BIOLOGICAL PROBLEM: ROLE IN THE FUNCTIONING OF THE HUMAN BODY
This article is like a summary of many other science stories about vitamin D—it tells you what scientists think it does, but it doesn’t do any experiments itself. So we can say vitamin D is linked to stronger bones or a better immune system, but we can’t say it definitely causes those things.
Analysis score
Maximum 5 for a narrative review.
Where the score came from
Your body makes vitamin D from sunlight, and it helps your bones, muscles, and immune system work right. If you don’t get enough, your bones get weak, you get sick more often, and you might have trouble moving or thinking clearly.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 51 / 100
Quality score
Systematic reviews and meta-analyses of cohort studies. They sit above a single cohort study but below a single randomized trial, because the underlying evidence is still observational.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — many people worldwide have low vitamin D, and this can make them more likely to break bones, catch colds, or develop long-term health problems.
- 2Low vitamin D (<50 nmol/L) is linked to weaker bones, more falls, more infections, higher diabetes risk, and higher risk of Alzheimer’s and Parkinson’s.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Перспективи та інновації науки
Year
2026
Authors
Zhanetta A Chornenka, Anastasia Ruda
Related Content
Claims (6)
Low levels of vitamin D are associated with reduced immune regulation and disrupted metabolic function in humans.
People with serum vitamin D levels below 50 nmol/L have a higher risk of respiratory infections and reduced immune cell activity, particularly if they have limited sun exposure or chronic disease, because calcitriol influences T-cell and macrophage function.
Older adults with low vitamin D levels have weaker muscles and a higher chance of falling, due to how vitamin D affects calcium use and muscle cell function.
Low levels of vitamin D are linked to a higher chance of developing type 2 diabetes, as vitamin D influences the function of insulin-producing cells and the body's response to insulin.
People with low levels of vitamin D have a higher likelihood of developing Alzheimer’s disease and Parkinson’s disease.
Adults with low vitamin D levels, measured as serum calcidiol below 50 nmol/L, have reduced bone mineralization, which increases the risk of osteomalacia and osteoporosis with higher fracture rates, especially in older individuals, due to decreased intestinal absorption of calcium and phosphorus and altered bone remodeling processes.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.