Can sunbathing really prevent cancer?

Colorectal cancer, a familiar "health killer", has become the world's third most common cancer and the second most common cause of death from cancer, with more than 4 million cases

As we all know, the risk factors for colorectal cancer include obesity, high-fat and high-meat diet, high-calorie and low-fiber food intake, and sedentary life>

However, vitamin D is a fat-soluble vitamin with limited dietary sources.

Recently, a research team from the University of California, San Diego published an article titled "Could age increase the strength of inverse association between ultraviolet B exposure and colorectal cancer?" on BMC Public Health.

In this study, the researchers used the UVB estimates obtained by NASA in April 2017 and the incidence of colorectal cancer in 186 countries in the World Health Organization Global Cancer Database in 2018

They divided colorectal cancer cases from 186 countries into 6 groups according to the ages of 0-14, 15-29, 30-44, 45-59, 60-74, and 75 years old, and passed a series of linear regression and polynomial regression tests.

The results of the study found that according to the results of the Spearman grade correlation test, in each age group, the incidence of colorectal cancer is negatively correlated with UVB exposure.

The pictures from top to bottom are: the polynomial regression scatter plots of corrected UVB and colorectal cancer incidence in the three age groups of 45-59, 60-74, and 75 years old

The University of California study evaluated the negative correlation between vitamin D deficiency and the incidence of colorectal cancer at different ages worldwide

Reference materials:

[1]https://bmcpublichealth.