[tekgnos]

It is not surprising at all that Covid-19 matches what we already know about Vitamin D and Influenza. There are consequences for radically altering the environment in which humans evolved. We were nude outdoors and now we are clothed and indoors. When we do briefly go outside, we are all conditioned to slather on sunscreen, which blocks all Vitamin D generation.

Why do people tend to get sick in the wintertime and not the summer?

https://pubmed.ncbi.nlm.nih.gov/16959053/

[baix777]

Humans have being wearing clothes for about 170,000 years, indoors and outdoors, long enough for a evolutionary response. Along with fire, clothing is one of our great inventions and allows humans to live in colder climates than we could otherwise. We have, along with other creatures like lice, been evolving since we started wearing clothes.

But why do people get more sick in the winter, when they are forced into close proximity with other people, making illness easier to spread, rather than the summer, when people are outdoors more, and can do things like walk to work in the warm summer sun rather than take the bus in the cold winter rain and snow? Stated differently, we naturally do more social distancing in the summer.

[tekgnos]

Sure, there has been evolution. Like the adaptation of white skin for humans in northern latitudes. Why was it so important to evolve pale skin for humans living in high latitudes?

Social distancing in summer as a reason why people don't get sick is an interesting theory, any studies that support it?

[cwhiz]

>Why do people tend to get sick in the wintertime and not the summer?

There are lots of reasons for that. Vitamin-D is just one of those theories. There are also behavioral changes, such as people spending more time indoors and in sealed spaces. There is also the fact that certain viruses may survive better in colder, drier climates. There are also some theories that particles evaporate more quickly in the heat.

Not to mention... humans started wearing closes about 100,000 years ago.

[tekgnos]

Agree, it is a theory and one I believe. Also how/why white skin evolved is another data point to consider. Lighter skin means more Vitamin D in the summer months which is vital for humans in northern latitudes.

Clothes sure, but still were outside in the sunlight during most of the day without sunblock. Take a look at hunter gather tribes still alive today. Not a whole lot of clothes! But sure, some.