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Role of Skin in Vitamin D Synthesis01:23

Role of Skin in Vitamin D Synthesis

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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...
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Vitamins01:30

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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...
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Role of Vitamins in Maintaining Bone Health01:25

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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.
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Connective tissue develops from the mesoderm of a developing embryo and consists of cells, fibers, and ground substance: a gel-like material containing large complexes of carbohydrates and proteins. Connective tissue was first identified as a separate tissue family in the 18th century, and Johannes Peter Muller coined the term connective tissue.
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Skeleton and Calcium Homeostasis01:21

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Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
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Cancer Survival Analysis

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Cancer survival analysis focuses on quantifying and interpreting the time from a key starting point, such as diagnosis or the initiation of treatment, to a specific endpoint, such as remission or death. This analysis provides critical insights into treatment effectiveness and factors that influence patient outcomes, helping to shape clinical decisions and guide prognostic evaluations. A cornerstone of oncology research, survival analysis tackles the challenges of skewed, non-normally...
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Vitamin D and Mortality.

Stefan Pilz1, Martin Grübler2, Martin Gaksch3

  • 1Department of Internal Medicine, Division of Endocrinology and Metabolism, Medical University of Graz, Graz, Austria Department of Epidemiology and Biostatistics, EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands stefan.pilz@chello.at.

Anticancer Research
|March 16, 2016
PubMed
Summary
This summary is machine-generated.

Low vitamin D levels are linked to higher mortality risk. However, vitamin D3 supplementation shows a significant reduction in mortality, suggesting benefits and safety.

Keywords:
25(OH)DRCTVitamin Depidemiologymortalityreview

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Area of Science:

  • Endocrinology
  • Nutritional Science
  • Gerontology

Background:

  • Low serum 25-hydroxyvitamin D [25(OH)D] concentrations are associated with increased all-cause mortality risk.
  • This association is observed across diverse populations, including general and specific patient cohorts.
  • Previous studies suggest a U-shaped or reverse J-shaped relationship between 25(OH)D levels and mortality.

Purpose of the Study:

  • To review and synthesize current evidence on the relationship between vitamin D and mortality.
  • To evaluate the impact of vitamin D supplementation on mortality risk.
  • To discuss limitations and future directions in vitamin D research.

Main Methods:

  • Narrative review of observational cohort studies and meta-analyses of randomized controlled trials.
  • Analysis of data linking 25(OH)D concentrations to mortality risk.
  • Examination of vitamin D3 supplementation trials and their mortality outcomes.

Main Results:

  • Low 25(OH)D is consistently linked to increased mortality.
  • Meta-analyses of randomized controlled trials indicate vitamin D3 supplementation moderately reduces mortality.
  • Standardization of 25(OH)D measurements is crucial due to interassay variability.

Conclusions:

  • Vitamin D deficiency is a significant risk factor for mortality.
  • Vitamin D3 supplementation demonstrates a statistically significant mortality reduction, highlighting its benefits and safety.
  • Further research with standardized measurements is needed to refine understanding of the vitamin D-mortality relationship.