Related Experiment Video
Updated: Jul 10, 2026
03:20
Studying Chronic Exposure of Mice to Ultraviolet B Radiation
Published on: August 19, 2025
Does a high UV environment ensure adequate vitamin D status?
Michael Kimlin1, Simone Harrison, Madeleine Nowak
1Institute of Health and Biomedical Innovation, Queensland University of Technology, Australia. m.kimlin@qut.edu.au
Journal of Photochemistry and Photobiology. B, Biology
|October 30, 2007
Summary
Many adults in sunny Australia have low Vitamin D levels, especially in winter. Obesity and darker skin tones are linked to lower vitamin D status, highlighting a public health concern.
Area of Science:
- Nutritional Science
- Public Health
- Endocrinology
Background:
- Vitamin D is crucial for bone health and immune function.
- Deficiency is a global health issue, even in sunny regions.
- Understanding Vitamin D status in diverse populations is essential.
Purpose of the Study:
- To assess Vitamin D status in healthy Australian adults.
- To identify factors associated with Vitamin D deficiency and insufficiency.
- To evaluate the prevalence of low 25(OH)D levels at the end of winter.
Main Methods:
- 126 healthy adults in Queensland, Australia, participated.
- Blood samples analyzed for 25(OH)D, PTH, Calcium, Phosphate, and Albumin.
- Questionnaires collected data on sun exposure, behaviors, and demographics; phenotypic characteristics were assessed.
Main Results:
- 42.5% of participants had deficient or insufficient Vitamin D levels (<50 nmol/l).
- Higher sun exposure correlated with increased 25(OH)D levels.
- Obesity (BMI>30) and darker phenotypic traits (hair, skin, eye color) were associated with lower 25(OH)D.
Conclusions:
- A significant portion of the Australian population experiences low Vitamin D at winter's end.
- Sun exposure and phenotypic characteristics are key determinants of Vitamin D status.
- Public health strategies may be needed to address Vitamin D insufficiency in this population.
Related Concept Videos
01:23Role of Skin in Vitamin D Synthesis
The skin plays a crucial role in the synthesis of vitamin D, a vital nutrient for various physiological processes in the body. Vitamin D is unique because it can be synthesized in the skin through a series of chemical reactions triggered by exposure to ultraviolet B (UVB) radiation from sunlight.
The solar UV B rays (290-315 nm) are absorbed by the skin, and 7-dehydrocholesterol (provitamin D3) photolyzes it to previtamin D3, which undergoes a rapid transformation to vitamin D3(cholecalciferol).
The solar UV B rays (290-315 nm) are absorbed by the skin, and 7-dehydrocholesterol (provitamin D3) photolyzes it to previtamin D3, which undergoes a rapid transformation to vitamin D3(cholecalciferol).
01:35Mutations
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
01:39Mutations
Overview
01:25Role of Vitamins in Maintaining Bone Health
The growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...
01:30Vitamins
Vitamins, derived from the Latin word for life, are essential organic substances required in small quantities for optimal growth and overall well-being. Unlike other organic nutrients, vitamins don't act as sources of energy or building materials but rather facilitate these nutrients' utilization by the body. Vitamins are predominantly coenzymes, assisting enzymes in specific chemical actions, like the oxidation of glucose for energy involving B vitamins. Most vitamins are not produced in our...
01:19Pigmentation
The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...