The skin of arctic tribes…

The skin of arctic tribes people are dark because they get all their vitamin D from fish instead of sunlight. Their skin does not need to lighten to try and get more sun for vitamin D production.

Vitamin D deficiency is linked…

Vitamin D deficiency is linked with many health disorders, including depression. In a survey of almost 8,000 US residents, it was found that those with lower vitamin D levels “are at a significantly higher risk of showing depression”.