An Bras Dermatol. 2019 Jul 29;94(3):279-286. doi: 10.1590/abd1806-4841.20197201.
Coutinho RCS1,2, Santos AFD2,3,4, Costa JGD3,5, Vanderlei AD2,6.
88% of the fishermen at 10 degrees latitude had 30+ ng/ml of Vitamin D
- Most S. Calif lifeguards have good level of vitamin D (above 40 ng) - Aug 2016
- 20 cent vitamin D pill similar to 2 hours sunbathing at 60 degree latitude – RCT Aug 2013
- Parkinson’s patients 50X less likely to get even a little sun– meta-analysis Jan 2019
- Have We Gotten Sunscreen Totally Wrong - Jan 2019
- UV – adverse and beneficial effects – review Nov 2014
- Vitamin D protects DNA against UV skin damage – 5 studies 2012-2013
- The Risk of Skin Cancer From Sun Exposure Is Overblown - May 2019
- Melanoma 25 X more likely if low vitamin D – Feb 2018
- Overview Suntan, melanoma and vitamin D
- 8X death rate for indoor workers during World War 1
- Vitamin D Myths - SUN has the following
- Should limit time in the sun to reduce cancer:
- Nope - low exposure will INCREASE total cancer by 50X
Exposure to UVR provides benefits related to vitamin D synthesis, but also causes harms, since UVB is considered a complete carcinogen. There is no definition of the level of sun exposure and the proportion of exposed body required for proper synthesis of vitamin D in the skin without causing it damage.
OBJECTIVES: This study aims to analyze the sun exposure index, vitamin D levels and clinical changes in the skin caused by constant sun exposure in the fishermen population.
It is a cross-sectional, observational and analytical study. The sample consisted of fishermen and was calculated in 174 individuals. The questionnaire was applied, the dermatological examination was carried out and the examinations of calcidiol, parathyroid hormone, calcium and phosphorus were requested. Data were expressed as percentages. The comparative analysis was done through the Chi-square test, and the correlations were established through the Pearson's linear coefficient. Results: We observed that there was vitamin D deficiency in a small part of the cases (11.46%), and the frequency of diagnosis of skin cancer was 2.7% of the cases surveyed.
STUDY LIMITATIONS: The difficulty in categorizing the sun exposure index.
The fact that fishermen expose themselves to the sun chronically and have been exposed to the sun for more than 15 years, between 21 and 28 hours a week, and without photoprotection, were indicative factors for protection against vitamin D deficiency. Chronic exposure to sun and high vitamin levels D may be indicative of protection of this population against skin cancer.
“There was a low prevalence of diagnosed cases of skin cancer among the fishermen when compared to the general population.”