Our ancestors didn&#x27;t spend all day in an office and only got to  go home when it was dark outside.<p>In a country like Sweden, you might not get sun when you go to work and home again. 
So spending all day outside hunting might have given you enough.<p>I feel better with Vitamin D, especially during the winter. Was also some research on how Somalians developer autism because of a severe lack of sun in Sweden: <a href="http:&#x2F;&#x2F;www.thelocal.se&#x2F;20110328&#x2F;32862" rel="nofollow">http:&#x2F;&#x2F;www.thelocal.se&#x2F;20110328&#x2F;32862</a>