Article
Agriculture, Dairy & Animal Science
Laure E. E. Molitor, Kelly Rockwell, Amelia Gould, Mark A. A. Mitchell
Summary: Vitamin D is an important hormone that can be obtained through diet or exposure to UVB radiation. Limited research has been conducted on the effects of UVB on domestic rabbits, but initial findings have shown that artificial UVB exposure for 12 hours can increase their vitamin D levels. This study aimed to determine if shorter-duration UVB exposure can have a similar effect. The results demonstrated that 6 hours of artificial UVB exposure over 14 days can indeed increase vitamin D levels in rabbits.
Article
Medicine, General & Internal
Seok-Hoon Lee, Nam-Seok Joo
Summary: This study aimed to investigate the effect of NBUVB-LED exposure on serum 25(OH)D concentrations. The results indicated that NBUVB-LED exposure might increase serum 25(OH)D levels. However, further research is needed to validate these findings.
Article
Biochemistry & Molecular Biology
Thomas M. Elliott, Louisa G. Gordon, Ann Webb, Richard Kift, Anna Foeglein, Rachel E. Neale
Summary: Our goal was to calculate the time required to maintain existing 25-hydroxyvitamin D (25(OH)D) concentration in different locations in Australia and New Zealand. Using a microsimulation model, we estimated monthly changes in 25(OH)D concentration based on data on standard erythemal dose, solar zenith angle, and climatological ozone. We found that 5-10 minutes of outdoor activity between 8 a.m. and 4 p.m., with 35% of the body surface area exposed, is sufficient to maintain existing 25(OH)D concentration in summer, while in winter, more time outdoors during the middle of the day is required, with 10% of the body surface area exposed.
PHOTOCHEMISTRY AND PHOTOBIOLOGY
(2023)
Article
Medical Laboratory Technology
Francesco Vierucci, Lara Fusani, Alessandro Saba, Tania Minucciani, Maria Paola Belluomini, Raffaele Domenici, Gian Luca Bracco, Angelina Vaccaro, Giovanni Federico
Summary: This study assessed the relationship between assumed risk factors for maternal vitamin D deficiency and levels of cord blood 25(OH)D-3 and C-3-epimer. The results showed that vitamin D deficiency was common in newborns, especially those born to mothers who did not receive vitamin D supplementation and had poor sun exposure.
CLINICA CHIMICA ACTA
(2022)
Article
Nutrition & Dietetics
Chun Zhou, Ziliang Ye, Sisi Yang, Xiaoqin Gan, Yanjun Zhang, Mengyi Liu, Panpan He, Yuanyuan Zhang, Qimeng Wu, Jing Nie, Xianhui Qin
Summary: The study found that serum 25(OH)D concentrations, sun exposure time, and dietary vitamin D intake were all inversely associated with the risk of new-onset AKI. However, genetic susceptibility did not significantly modify these associations.
JOURNAL OF NUTRITION
(2023)
Article
Public, Environmental & Occupational Health
Kate M. Miller, Robyn M. Lucas, Elizabeth A. Davis, Prue H. Hart, Nicholas H. de Klerk
Summary: Serum 25 hydroxyvitamin D levels in pregnant women have been linked to health outcomes in their offspring. Satellite-derived ultraviolet radiation data has been used as a proxy for 25(OH)D levels, with daily UVR dose in the 90 days prior to venesection being a significant predictor of 25(OH)D levels. The study found that NASA-derived daily UVR dose can effectively predict 25(OH)D levels in pregnant women.
INTERNATIONAL JOURNAL OF EPIDEMIOLOGY
(2021)
Review
Endocrinology & Metabolism
Ann R. Webb, Rehab Alghamdi, Richard Kift, Lesley E. Rhodes
Summary: A systematic review on the change in vitamin D status after UV exposure identified 2001 publications, concluding that low dose sub-erythemal doses are more effective for vitamin D synthesis and presented a dose-response model.
ENDOCRINE CONNECTIONS
(2021)
Article
Biochemistry & Molecular Biology
Shufei Zeng, Chang Chu, Cornelia Doebis, Volker von Baehr, Berthold Hocher
Summary: There is a strong positive linear correlation between free 25(OH)D (f25(OH)D) and total 25(OH)D, making them useful for assessing vitamin D levels. The recommended threshold level for f25(OH)D is 8.499 pg/mL, corresponding to a target concentration of at least 30 ng/mL for t25(OH)D. The upper limit for vitamin D is still unclear, with most experts favoring a upper limit of 100 ng/mL for t25(OH)D.
JOURNAL OF STEROID BIOCHEMISTRY AND MOLECULAR BIOLOGY
(2021)
Article
Nutrition & Dietetics
Guowei Li, Likang Li, Jonathan D. Adachi, Ruoting Wang, Zebing Ye, Xintong Liu, Lehana Thabane, Gregory Y. H. Lip
Summary: This study found a quasi J-shaped relationship between serum circulating 25-hydroxyvitamin D (25(OH)D) level and risk of recurrent stroke in patients with a stroke history. The lowest risk of recurrent stroke was observed at a 25(OH)D level of approximately 60 nmol/L, which was associated with a 48% reduction in risk compared to a level of 10 nmol/L.
Article
Nutrition & Dietetics
RuTong Wang, Weijing Wang, Ping Hu, Ronghui Zhang, Xue Dong, Dongfeng Zhang
Summary: This study aimed to evaluate the association between dietary vitamin D intake and serum vitamin D concentrations with cognitive performance in older Americans. The results showed a positive association between dietary vitamin D intake, serum total 25-hydroxyvitamin D, and cognitive performance, with no significant gender differences in the associations. Further research is needed to clarify the effects of dietary vitamin D intake and specific serum D concentrations on cognitive performance.
Article
Nutrition & Dietetics
Tarinee Khanna, Rasha Shraim, Masa Zarkovic, Michiel van Weele, Jos van Geffen, Lina Zgaga
Summary: This study characterizes the differences in UVB radiation relevant for vitamin D production in Europe. It reveals significant variations in D-UVB dosage among different regions and seasons, which can provide insights into the determinants of vitamin D status and guide sunlight exposure recommendations and vitamin D supplementation guidelines.
Article
Medicine, General & Internal
Keila Valente de Souza de Santana, Sofia Lizarralde Oliver, Marcela Moraes Mendes, Susan Lanham-New, Karen E. Charlton, Helena Ribeiro
Summary: This study aimed to assess the association between serum 25-hydroxyvitamin D [25(OH)D] concentrations and lifestyle-related factors in Brazilian women living at latitude 21 degrees 8' S. The findings showed that higher levels of 25(OH)D concentration were associated with higher exposure to ultraviolet radiation. Postmenopausal women had higher 25(OH)D concentrations compared to younger women, suggesting that sun exposure and lifestyle variables may interfere with these levels.
Article
Nutrition & Dietetics
Sonja Soininen, Aino-Maija Eloranta, Ursula Schwab, Timo A. Lakka
Summary: The purpose of this study was to investigate the intake and sources of vitamin D, as well as the determinants of serum 25-hydroxyvitamin D (S-25(OH)D) in Finnish adolescents. The results showed that most adolescents had vitamin D intake at the recommended level, although a quarter did not meet the recommended intake and almost a third had low levels of S-25(OH)D. The main determinants of S-25(OH)D were vitamin D intake from supplements, consumption of milk products, consumption of meat products, travels to sunny countries, and average daylight time.
EUROPEAN JOURNAL OF NUTRITION
(2023)
Article
Nutrition & Dietetics
Naoko Tsugawa, Mayu Nishino, Akiko Kuwabara, Honami Ogasawara, Maya Kamao, Shunjiro Kobayashi, Junichi Yamamura, Satoshi Higurashi
Summary: The study found that the low vitamin D status in recent lactating mothers may have decreased the concentrations of vitamin D and 25OHD in breast milk, compared to the 1980s. This has important implications for improving the vitamin D status of lactating mothers and infants.
Article
Multidisciplinary Sciences
Pernilla Stridh, Ingrid Kockum, Jesse Huang
Summary: This study examined the relationship between serum 25-hydroxyvitamin D levels and the age of first symptom onset in recently diagnosed MS patients. The results showed no association between serum 25-hydroxyvitamin D levels and age at MS onset, but a negative correlation was observed with CSF IgG index. Further investigation is needed to explore this correlation.
SCIENTIFIC REPORTS
(2021)