Population Health
Latitude and vitamin D deficiency: mapping regional risk
Vitamin D deficiency is often described as a problem of individual behavior: too little time outdoors, too little dietary intake, or inadequate…
Section
Population Health
Explore peer-reviewed data, policy briefs, and clinical trials categorized by key themes in micronutrient science and public health.
News
Optimizing Vitamin D Supplementation for Infants with Cholestasis
According to a recent evaluation published in Nutrients, researchers examined vitamin D status and the therapeutic response to calcifediol…
Population Health
Epidemiological data requirements for vitamin D fortification
When we look at the vitamin D status of adults across Europe, the numbers tell us something we already suspected but rarely say out loud: roughly…
Population Health
Winter Sun and Vitamin D: When Is Sunlight Not Enough?
In Greater Manchester, at roughly 53.5° North, researchers found something that should make every public health professional pause: during the winter…
Population Health
Population Vitamin D Screening: A Field Roadmap
In the United States alone, an estimated one in four adults presents with serum 25-hydroxyvitamin D levels below the Institute of Medicine's…
News
Vitamin D and B12 Levels: How Micronutrients Shape Sleep Quality in Aging Adults
Higher serum vitamin D concentrations are significantly associated with longer total sleep time and reduced wakefulness fragmentation in cognitively…
News
Vitamin D Levels and MASLD Risk: Insights from a Large-Scale Health Cohort
3, published this month in Frontiers in Nutrition, reports that higher circulating 25(OH)D tracked with meaningfully lower odds of metabolic…
Population Health
Skin pigmentation and vitamin D synthesis: clinical nuances
The marketing claim writes itself: darker skin blocks vitamin D production, melanin is a biological curse, deficiency is inevitable, and…
News
The Link Between Vitamin D Deficiency and Depression in Obese Asthma Patients
a study now indexed on PubMed and published in the Journal of Allergy and Clinical Immunology: In Practice, vitamin D deficiency is associated with a…
News
How Vitamin D Levels Mask Autism Symptom Severity in Children
According to a study published this week in Frontiers in Psychiatry, researchers following 699 children in China have documented what they describe…
Population Health
Should shift workers get routine vitamin D screening?
Every few months, the wellness industry repackages the same catechism: screen early, identify deficiency, supplement aggressively, normalize your…
Population Health
Winter vitamin D nadir: does latitude shift the timing?
The textbook version of the story says serum vitamin D bottoms out on the shortest day of the year. Every December 21st, the supplement marketing…
Population Health
Seasonal vitamin D tracking: three research models
A population can appear vitamin D deficient partly because of when it was measured. In the United States, serum 25-hydroxyvitamin D [25(OH)D]…
Population Health
Latitude vitamin D mapping: how to avoid costly data errors
Latitude is a weak proxy for population vitamin D status. In the available epidemiological data, ecological latitude accounts for less than 5% of the…
Population Health
Ethnic Vitamin D Studies: Pre-Launch Data Checklist
A routine baseline assumption in ethnic vitamin D research is easy to state and difficult to defend: apply one serum 25(OH)D cutoff, recruit a…
Population Health
Vitamin D dietary assessment: which tool suits your cohort?
A single day of dietary data can make vitamin D intake look either reassuring or negligible, depending on what happened to be served, purchased, or…
Population Health
Sun exposure tracking errors in vitamin D research
Vitamin D studies often treat outdoor time as a proxy for ultraviolet exposure. The proxy is weak. Participants round reported duration, overestimate…
Population Health
Does high BMI alter vitamin D monitoring needs?
The usual vitamin D recommendation — often expressed as a simple daily amount such as 400 IU, 800 IU, or occasionally 1,000 IU — carries an…
Population Health
Vitamin D prevalence study: data to gather before launch
Most researchers designing a vitamin D prevalence study still anchor the protocol to a single number — usually <20 ng/mL or <50 nmol/L — and assume…
Population Health
Elderly vitamin D tests: why routine screening wastes budget
Routine vitamin D testing in nursing homes is often treated as a basic quality-control measure. A resident enters long-term care, a 25-hydroxyvitamin…
Population Health
Does dark skin limit winter vitamin D synthesis?
The advice circulates with the confidence of folk wisdom: darker-skinned individuals struggling with low vitamin D should simply spend more time…
Population Health
Vitamin D monitoring: which method suits your risk group?
Vitamin D monitoring methods by demographic cannot be chosen responsibly from a single universal testing menu. The same laboratory result may carry…
Population Health
Vitamin D tests: how seasonal timing wastes your money
A vitamin D blood test is not a static measurement. Serum 25-hydroxyvitamin D [25(OH)D] changes across the year in response to seasonal ultraviolet…