Eating the last piece of bread my mom made
Hello #dayrebeauty !
I was inspired by @sweetpea 's sunblock post and I thought I'd weigh in and share what I know as a cosmetic science student! :D
She is absolutely right that applying sunblock is extremely important, especially for most of you who live in the tropics where it's ALWAYS sunny.
So, shall we begin? 😊
Sunblocks, sunscreens, and whatever else they are called, are products meant to protect the skin against Ultraviolet (UV) radiation.
The UV radiation spectrum can be broken down into 3 sub-spectrums: UVA, UVB and UVC.
UVC is said to be absorbed by the ozone layer in the atmosphere so it is assumed to not affect the skin.
However, new research shows that a bit of UVC does penetrate the ozone layer and remember the big hole over Aussie?
No real reason to panic tho, the top layer of your skin, the epidermis, is capable of stopping UVC from penetrating deeper.
Still, UVC can cause burning (sunburns) and cancer so in future, we might see a new rating for UVC protection.
UVB, wavelength of 280 - 320 nm, is absorbed by the atmosphere. This amount varies with the angle of the sun, which is dependent on the time of the day, day of the year and the latitude (where you are on earth).
UVB penetrates the epidermis to reach the second layer (the dermis). UVB causes burning, tanning, ageing and may lead to skin cancer.
The SPF rating on the sunscreen shows the protection the product offers against UVB radiation.
UVA has a wavelength range of 320 to 400 nm. It is less absorbed by the atmosphere and penetrates the dermis.
Also, 94% of the UV radiation during summertime is actually UVA.
In addition to burning, tanning and cancer, UVA causes premature aging, photosensitivity.
Initially sunscreens only had SPF rating but that only showed how well the sunscreen protects the skin against UVB, not against UVA. So, a new rating system was brought in, the PA rating.
I'm not here to scaremonger and make you panic and slap on sunblock like your life depended on it (actually it kinda does) so I feel like I need to talk about the effects of sun exposure, both positive and negative.
Positive effects of sun exposure
UV radiation is necessary for the skin to produce vitamin D. 15 mins of daily sun exposure on the hands and face will allow your skin to produce enough vitamin D.
A vitamin D deficiency results in rickets, hyperthyroidism and aggravates osteoporosis.
You can get vitamin D from your diet tho, in countries where they don't get enough sun, it was a thing to eat cod liver oil.
I don't know if any of you remember or had to endure Scott's emulsion. 😂😂
okay la I think the orange flavoured one was still alright. I do remember the horrible unflavoured one though, damn smelly omg 😂
UV also reduces blood pressure by triggering the release of nitric oxide.
And let's not forget gorgeous tans! 😁
So SOME sun exposure is good.
What happens when your skin is exposed to too much UV radiation?
Negative effects of sun exposure
Acute damage would be sunburns which may cause blisters in serious cases.
If you've ever gotten a sunburn before, you'll probably also remember your skin peeling off after a few days. Damn gross I know 😂
But no joke, sunburns can be fatal, especially for young children :(
Chronic (long-term) sun damage includes:
Photoageing, where you get wrinkly 😱 or your skin loses elasticity and becomes papery (just look at your grandma's hands)
Photosensitivity, skin becomes abnormally sensitive to light.
And worst of all would be skin cancer. 😔
Skin cancer can be divided into two main types: melanoma and non-melanoma. The latter is usually non-fatal while the former can be fatal if not treated early.
This is another chronic effect of sun exposure: solar comedones (blackheads caused by the sun)
The skin around the comedones also grow thicker and yea, no matter how lazy you are with skincare, I'm pretty sure you don't want your skin to look like this when you are older!
So yes people, apply your sunblock!!! It really is important if you want to look younger for longer and of course if you want to avoid melanoma.
I'm a bit sleepy now so I'll continue part two of my guide to sun protection tomorrow!
I'll be explaining more about the ingredients involved, SPF and PA rating so hopefully you will be more confident about choosing sunblocks.
#skincare #pheebsskincare #beauty #pheebscosmeticsguide #pheebsguidetosunprotection
Friday, 8 Jul 2016
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