I think to a certain degree we can adapt to the amount of sunlight at a young age, or even in the womb. Just as we do for food scarcity, see the Dutch winter famine [1]

This article seem to point into the direction of epigenetics. [2]

- [1] https://www.nytimes.com/2018/01/31/science/dutch-famine-gene...

- [2] https://geneticliteracyproject.org/2016/10/17/black-white-tw...