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Work hours - lack of daylight?

I thought abit about the natural vitamins and effects that people get from sun and daylight. For scandinavian people it is general knowledge that in the months of winter, get depressed and nutrientdeficient if we spend the whole working week indoors

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People can get their own body generating some vitamins and nutrients from just 15 minutes of sunlight on the skin. I think that these effects are vital for helping the body absorb the other vitamins and nutrients from all the food.

I was thinking that sunrise and sunset in Colombia (near the equator) is pretty much constant around 6 am to 6 pm every day around the year. I imagine low-income workers are confined to low-paying, low-prestige jobs, like cleaning or inside factory. Or even working on a constant night shift. Or their home is in constant shade from surrounding mountains or other building structures.
Whatever way they strive in their daily life, I thought it is possible that some people gets too little amount of sun rays.

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For scandinavian people it is general knowledge that in the months of winter, we normally get a bit depressed and nutrientdeficient if we spend the whole working week indoors. It is proven in medical research that rate of severe depression and suicides  are rising in middle of winter in Sweden and Finland when there is sunrise and sunset around lunch time. And in some extreme northerly areas there is several weeks with the sun being below the horizon.
So here it is developed knowledge about "solar UV- and IR-lamp treatments" and other similar to help prevent these deficiencies. And also of course to spread this info publically with announcements that states how important it is to get at least 15 minutes of sunshine on your skin each day.

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( right now we have the exact opposite problem, it is in the middle of a glorious summer and the sunrise is around 3 oclock in the morning and sun sets about eleven oclock at night in my area. Around the polar circle there is daylight all night now... So very good dark-out-curtains is necessary in the bedrooms, to get proper amount of sleep at night )

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maybe I should also point out the obvious medical warning, that too much direct sunlight can cause skin damage, and being outside in hot climate could be dangerous for long periods of time. so take care, use sun protective creams and rehydrate constantly.

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