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Skin exposure to UVB light induces a skin-brain-gonad axis and sexual behavior
151–160 of 164 posts
Re: Skin exposure to UVB light induces a skin-brain-gonad axis and sexual behavior
#152Earlier quoted context omitted.
Shit like what??
Zinc oxide and titanium dioxide are the only two sunscreen ingredients the FDA considers truly safe sunscreen ingredients, and as someone with a basic understanding of biology, I tend to agree with them on this (1). Zinc oxide and titanium dioxide nanoparticles refuse to penetrate the skin even when rubbed into open wounds and they have negligible effects in vivo when used topically. Additionally and crucially they b…
I mostly use zinc oxide sunscreen and don't think I look awful, which I understand is both a personal opinion and also something that can vary from person to person based on skin tone.
Re: Skin exposure to UVB light induces a skin-brain-gonad axis and sexual behavior
#153Earlier quoted context omitted.
The UK - and I presume Europe - has a star rating for UVA protection in addition to SPF. Some details here: https://www.nhs.uk/live-well/seasonal-health/sunscreen-and-s... Tl;Dr - you want minimum 5-star 30 SPF for your daily cream.
Do people actually use sunscreen every day? I wouldn't think a little sun (well before a burn) is that likely to cause problems?
Yes the recommendation is SPF15 every day, even in winter.
Many daily moisturisers will have at least SPF15 so it's no hardship since you're already moisturising every day anyway.
Re: Skin exposure to UVB light induces a skin-brain-gonad axis and sexual behavior
#154Earlier quoted context omitted.
It is probably birth control in the water supply that are causing birth rate declines.
That has been thoroughly studied and debunked. Just one example of many: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2854760/ Add to this the fact that less than 1% of the estrogen in the water supply is from The Pill.
That paper used predicted estrogen instead of measuring estrogen. I wouldn't say it has been studied at all based on that link.
Re: Skin exposure to UVB light induces a skin-brain-gonad axis and sexual behavior
#155Earlier quoted context omitted.
> boosted by from inflammatory effects of UV damage That wording supports a notion that the boosting is to encourage the most essential activity of a species—reproduction—in the face of potential harms that may shorten the opportunity for that activity (cancer-induced final exit). That said, I’m aware of counterarguments to the simplistic takes on “sun bad” messaging and think they have merit. Not trying to open a de…
That seems a bit simplistic of an interpretation when there are no similar effect for dehydration, hunger, loss of a limb, or other potential harms. Many animals are seasonal. And extra sun exposure might indicate a good time to mate (spring/summer)
Your example harms have an immediate effect. Sun exposure usually does not.
Re: Skin exposure to UVB light induces a skin-brain-gonad axis and sexual behavior
#156Earlier quoted context omitted.
I'm open to the argument that it's wrong/irrational, but I would wager that - at least in the USA - people wearing sunscreen are doing it to avoid skin cancer more than to avoid tanning.
"...skin cancer kills surprisingly few people: less than 3 per 100,000 in the U.S. each year. For every person who dies of skin cancer, more than 100 die from cardiovascular diseases." Personally, I'm from the UK and don't worry about skin cancer. If I was in Australia or some climate I'm not adapted for then I'd be concerned.
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Re: Skin exposure to UVB light induces a skin-brain-gonad axis and sexual behavior
#157Yet another piece of knowledge everyone should already be aware of, but apparently isn't.
Re: Skin exposure to UVB light induces a skin-brain-gonad axis and sexual behavior
#158Earlier quoted context omitted.
Shit like what??
Zinc oxide and titanium dioxide are the only two sunscreen ingredients the FDA considers truly safe sunscreen ingredients, and as someone with a basic understanding of biology, I tend to agree with them on this (1). Zinc oxide and titanium dioxide nanoparticles refuse to penetrate the skin even when rubbed into open wounds and they have negligible effects in vivo when used topically. Additionally and crucially they b…
Of all the metalic elements, Zinc is relatively harmless and actually has been shown to inhibit the process of viral replication.
By the way no one knows how elements behave on the quantum level we don’t have a quantum computer nearly powerful to simulate anything more than hydrogen
Re: Skin exposure to UVB light induces a skin-brain-gonad axis and sexual behavior
#159Earlier quoted context omitted.
Zinc oxide and titanium dioxide are the only two sunscreen ingredients the FDA considers truly safe sunscreen ingredients, and as someone with a basic understanding of biology, I tend to agree with them on this (1). Zinc oxide and titanium dioxide nanoparticles refuse to penetrate the skin even when rubbed into open wounds and they have negligible effects in vivo when used topically. Additionally and crucially they b…
Of all the metalic elements, Zinc is relatively harmless and actually has been shown to inhibit the process of viral replication. By the way no one knows how elements behave on the quantum level we don’t have a quantum computer nearly powerful to simulate anything more than hydrogen
There are some relevant effects of UV on these semiconductor sunscreens to consider. For example:
It is generally agreed that UV absorption excites an electron from the valence band to the conduction band of the semiconductor. The resulting excited electrons, in the otherwise empty conduction band, and the “positive holes” in the valence band allow charge transfer to the TiO2 surface which facilitates oxidation of surrounding molecules. Sometimes direct charge-transfer causes the oxidation.
https://www.mdpi.com/1420-3049/19/11/18192/htm
Some questions which stem from this finding include: what is being oxidized on the skin in its immediate vicinity when UV makes contact with the semiconductor sunscreen? What are the implications?
Is there any performance difference between nanoparticle sizes?
Re: Skin exposure to UVB light induces a skin-brain-gonad axis and sexual behavior
#160Earlier quoted context omitted.
Zinc oxide and titanium dioxide are the only two sunscreen ingredients the FDA considers truly safe sunscreen ingredients, and as someone with a basic understanding of biology, I tend to agree with them on this (1). Zinc oxide and titanium dioxide nanoparticles refuse to penetrate the skin even when rubbed into open wounds and they have negligible effects in vivo when used topically. Additionally and crucially they b…
I mostly use zinc oxide sunscreen and don't think I look awful, which I understand is both a personal opinion and also something that can vary from person to person based on skin tone.
I think they’re referring to the white overtone that zinc based sunscreen leaves due to poor absorption