Indoor Tanning Makes Youthful Skin Much Older on a Genetic Level

I also walk a lot when I can and weather allows. I started walking with a weighted vest occasionally and it was like my body went into some kind of good shock. I was surprised how little I could feel it the next day, and the boost in energy.

UV comes in an huge variety of strengths outdoors.

There are no calculations to be a "bit off". It's just strong UV. You're making it sound a lot more complicated than it is.

String reaction? I didn’t make any such claim.

I don’t think we need to replicate everything about nature to incorporate what we know about nature, ourselves, and the practical details of our lives.

I have bright LEDs around my ceilings, hidden by cove molding, turning the whole ceiling into soft but bright reflected daylight.

It doesn’t need to replicate a real summer day outside to improve my mood and avoid depression in winter. Much better than ordinary indoor lighting.

Most people take some kind of supplement or medication that doesn’t replicate pre-technological natural conditions but provide benefits.

Improving our respective conditions, in the artificial world we live in, can involve quirky adaptations for each of us.

The calculation isn’t as straightforward as it could be, because there are the wavelengths of UV you want for health benefits vs. the wavelengths that so the most damage and are more efficient for tanning.

So I figured go short on time and “long” on body coverage. Which I think means I am getting more benefit.

For what it is worth, one minute does seem to generate that feel good after tanning or day in the sun feel. With two minutes it’s very noticeable, but I am serious about getting the most benefit, while limiting exposure.

They almost always just stick to tones within the realm of pantone's skin guide, treating it more like a skin bible instead.

Haus labs and their triclone in 000 is one of the few foundations I've ever had match.

Melanotan is dangerous, sadly.

Tanning causes melanocyte production in your epidermis. Melanotan causes it throughout your body in an uncontrolled manner.

It can lead to uncontrolled melanocyte production that doesn't shut off - cancer.

It disrupts normal hormone signalling which may downstream cause a variety of deleterious health effects and disease states.

This. Same with curly vs straight hair.

The grass on the other side has a different amount of melanin be harder-to-achieve and thus more desirable because it previously signaled belonging to the higher socio-economical strata.

While I believe there are many benefits of being outside and exercising, there does appear to be specific benefits to sun-like UV exposure.

So they put the kids on trains and took them off to the seaside.

But then...

The railway also allowed milk to be brought into the cities. So they added vitamin D to milk. That was how the rickets was solved. In time milk became free at school, usually it was warm by morning break, which was when it would get consumed, from mini-milk bottles, that would get reused.

I am only piecing together this history, no definitive source, unless you include my elderly neighbour. However, food history is fascinating, once you get away from celebrated brands to the unsung heroes of the vegetable aisle.

What I can't work out is why the children were so vulnerable to rickets when the adults weren't. Workers weren't being sent out to the countryside or beach to get some sun, just the kids. Rickets doesn't affect adults with grown bones, in theory, the adults should have had really painful joints and osteoporosis, but maybe this was not understood at the time.

In time the clean air zones were setup and the smog was banished to a certain extent, by which time it became uncommon to fortify milk with vitamin D. Finally we had Margaret Thatcher, famously the 'milk snatcher', for stopping free school milk.

In the UK we do get vitamin D randomly added to processed foods (what else?) and this is a scattergun approach to fortifying the population. If you don't eat processed foods then you are not going to get any of that processed food fortification goodness.

Then there are the animal corpse sources, as in oily fish and whatnot. If you eat any diet except for whole-food-plant-based vegan, then you are going to get vitamin D either through dead animal or fortification. Vegetarians just have to eat maaassivve blocks of cheese, which they will, with a few eggs and some breakfast cereal to get their vitamin D needs roughly covered. Junk-food vegans should get some vitamin D goodness from fortifications too, particularly if they consume things like 'oat milk' (as if oats have mammary glands). Pure junk food, a.k.a. 'Standard American Diet', should also be pretty good for vitamin D.

So this only really leaves the whole-food, plant-based, everything-cooked-from-scratch vegan diet as lacking, at least as far as the winter months is concerned. Was this a problem historically? I don't think so. Since people used to work the fields, they had plenty of vitamin D to carry over for winter.

Before we had 'modern day racism' in the UK, we had a situation where the aristocracy had white skin and everyone else had leathery brown skin, from working outside. White skin was proof that you didn't have to work the fields and therefore, you were higher status. Racism pre-dated racism, if you get my drift, it was mere class-based xenophobia back then. To be 'truly white' you had to have no tan.

Since meat was hard to come by, peasants were 95% vegan by default, yet working the fields, so vitamin D deficiency was not a problem, for the 1% aristocracy (since they had their oily fish, red meat and dairy) or for the 99% that had to spend lots of time outdoors.

I am not sure where you are coming from regarding the Gulf Stream and cereals. The Fertile Crescent was where farming began for Europe, with wheat not actually growing in the UK and other grains (barley) being the chosen grain. It was only with the Norman Conquest that wheat made it to the UK.

When the Romans made it to the UK they were perplexed at what they found. There were two tribes, the nomadic cattle types and the hill fort living grain growers that were not nomadic. The hill forts got in the way of the migration routes between pastures. The Romans were disgusted by the milk drinking since nobody would do that in Rome, where everyone was lactose intolerant, unlike the Celts.

Getting sufficient vitamin D takes 6x longer sun exposure for black people than for white people. [2]

1: https://pmc.ncbi.nlm.nih.gov/articles/PMC7913332/

2: https://news.feinberg.northwestern.edu/2011/09/20/vitamin-d/

My favorite one that I read about is mushrooms. If you grow them in the sun, some species allegedly acquire vitamin D. I am not sure how much nor if this is truly effective, but it gives me a good excuse to grow various mushrooms next spring.