Questions tagged [sun-exposure]

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1 answer
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General Population Low Vitamin D Levels

In the answer to Is it advisable to wear UV protected swimsuit that covers arms and legs for skin protection to an outdoor swimming pool? by @Anko, it was stated that you can get enough vitamin D from ...
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6 votes
3 answers
193 views

Does the use of sunscreen inhibit Vitamin D production?

Vitamin D is produced in the skin when exposed to sunlight. Therefore, when using sunscreen on the skin, is Vitamin D production inhibited?
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6 votes
1 answer
94 views

Is it advisable to wear UV protected swimsuit that covers arms and legs for skin protection to an outdoor swimming pool?

Is it advisable to wear UV-protected swimsuit that covers arms and legs for skin protection to ward off skin cancer? Or is it too paranoid, given that most men and women wear swimming trunks / ...
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5 votes
2 answers
19k views

Is early morning sunlight as good as evening sunlight for health?

There are several references which say that early morning sunlight would give the best benefits (like this and that). This comes from the common consensus that most of the harmful rays, at that time, ...
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4 votes
2 answers
4k views

Does vitamin D synthesis occur in indirect sunlight?

I know you don't get a tan through a glass window. But I don't know whether tanning and vitamin D are produced using identical wavelengths. So my questions are : -Do you synthesise vitamin D through ...
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4 votes
1 answer
119 views

Does the damage from sun exposure outweigh the benefit of getting vitamin D?

I have read some articles where they recommend a direct exposure to the sun of about 20 to 30 minutes, others say that 10 to 15 minutes, another that 5 minutes is enough, etc. I suppose it depends on ...
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  • 191
4 votes
0 answers
52 views

Why do you not need sun protection whe the UV index is 3?

In Australia, they recommend sun protection when the UV index is above 3. Why is this? Surely whenever it's above 0 there are still UV rays hitting your skin? Would 10 minutes in the sun with a UV ...
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4 votes
0 answers
171 views

Craving sunlight with melatonin?

I have noticed a very strange, but positive, side effect of taking melatonin supplements or cherries high in melatonin (I have blood tests which confirmed food allergies, and apparently my absorption ...
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3 votes
0 answers
44 views

Are cheap sunglasses dangerous?

Does having any plastic between your eyes and the environment automatically provide UVA and UVB protection? Or do the lenses actually have to be coated (or be comprised of a special type of plastic) ...
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2 votes
1 answer
950 views

Can people who are epileptic be more sensitive to heat exhaustion/heat stroke?

Epilepsy is a condition that seems to encompass many possible things: A neurological disorder marked by sudden recurrent episodes of sensory disturbance, loss of consciousness, or convulsions, ...
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2 votes
0 answers
32 views

Do bearded faces age slower?

Recent research indicates that UV exposure may be responsible for around 80% of facial skin aging symptoms. The more unprotected exposure from the sun, the more the skin ages. Does the evidence show ...
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2 votes
0 answers
83 views

Test UV protection on sunglasses

I bought sunglasses in China that claims to have UV400 protection. I'd like to test this as my eyes' health is on the line :) Is there any way to check the maximum UV amount these glasses can protect ...
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  • 121
2 votes
1 answer
46 views

Safe UV exposure time

How long can our body be exposed to UV to not cause health problems like skin cancer, etc,. In some parts of the USA, the UV index can reach High (7-9). I'm trying to understand if I need to stay ...
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  • 121
1 vote
1 answer
52 views

Why do most of an average person's UV exposure from the sun occur before the age of 18?

I read on https://www.epa.gov/radtown/ultraviolet-uv-radiation-and-sun-exposure: Most of an average person's UV exposure from the sun occurs before the age of 18. Why do most of an average person's ...
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1 vote
1 answer
44 views

Does any drug/cream help prevent DNA damage post UV exposure?

I read on https://medicine.yale.edu/news-article/sun-damage-occurs-even-after-sunset/: When UV light hits the skin , it causes a type of DNA damage known as a cyclobutanepyrimidinedimer (CPD) , in ...
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1 vote
1 answer
46 views

Sun exposure damage

I had a lot of times in my life when I got seriously sunburned (my skin got extremely red). Though, after the sunburns pass, I become a lot darker and tanned and then I do not get burned any more, ...
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1 vote
1 answer
50 views

How long does it take to beat vitamin D deficiency [closed]

I have had vitamin D deficiency (17 ng/mL) and I am planning on sitting in sun at noons. I am aware of that how much UVB you get depends on a few factors such as your complexion, where you live and ...
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  • 111
1 vote
0 answers
40 views

Is how much you prevent sun damage and how much less you get tan and vitamin D an exact trade off? [duplicate]

Is how much you prevent sun damage and how much less you get tan and vitamin D an exact trade off? I know the more sunblock you put on the less you tan, but is the mechanism of tanning purely ...
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1 vote
0 answers
43 views

How dangerous for the human skin are naturally occurring wavelengths above 380nm?

I read on https://www.cancer.org/cancer/cancer-causes/radiation-exposure/uv-radiation.html: UVA rays have the least energy among UV rays. These rays can cause skin cells to age and can cause some ...
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1 vote
0 answers
28 views

Is it better to tan for 10 minutes without sun protection or the equivalent x amount of minutes with sunscreen?

For tanning efficiency purposes (i.e. getting as tanned as possible with as little skin damage as possible) is it better to tan for 10 minutes without sunscreen or the equivalent x amount of minutes ...
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1 vote
0 answers
251 views

How long can a fair skinned person be safely exposed to the sun without sunscreen?

I realize the answer to this question varies with the time of day (most recommendations are to avoid exposure between 10am and 2pm), latitude, altitude, medication and other factors, and goes as far ...
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1 vote
0 answers
26 views

Relationship between UPF/SPF and reduction in UV damage

I'm trying to untangle the relationship between the UPF/SPF rating of clothing or sunscreen and its effectiveness at reducing health risks from exposure to sunlight. The first complication is that a ...
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