Earlier quoted context omitted.
Staying out of the sun has significant downsides.
Like what? I assume he's taking vitamin D3.
It’s also associated with higher endorphin levels, and the maintenance of proper circadian rhythm through melatonin synthesis.
Most of these effects have been found to be unrelated to vitamin D, but that’s also a significant benefit considering the poor bioavailability of supplements.
The reduction in all-cause mortality from sunlight exposure is significant enough that people with an early diagnosis and treatment of non-melanoma skin cancer have a higher average life expectancy than the general population.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5129901
https://onlinelibrary.wiley.com/doi/10.1111/joim.12496