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In this day of COVID19 people should take breaks in midday and get some sun. The UV-B rays from the sun turn cholesterol in the skin into Vitamin D.
Vitamin D regulates the immune system. Along with Vitamin K and minerals it regulates blood clotting.
There are appears to be a direct correlation between vitamin D deficiency and the severity of COVID-19.
People who have jobs where they are indoors all day fare worse with the disease than those who work outdoors.
UV B rays are the most intense rays. They are filtered by windows. You have go outside. The best time to get sun is at noon.
A walk in the sun at noon doesn't just make people more productive. It dramatically improves the immune system and reduces the severity of COVID19.