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Is sunscreen the new margarine? (2019)

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Re: Is sunscreen the new margarine? (2019)

#21

Post by JR1427 »

Zenbit_UX wrote: post #19
JR1427 wrote: post #11

Earlier quoted context omitted.

I've not heard that grey hair is sun damage. Do you have any sources for that?

There’s plenty, though please evaluate the veracity of their claims for yourself, I’m not a scientist nor do I excel at parsing scientific articles. Here’s one I’ve come across after a few minutes which references many others https://www.sciencedirect.com/science/article/abs/pii/S10111...

After a quick skim, that article seems to be talking about something other than typical age-related greying. More photobleaching.

Re: Is sunscreen the new margarine? (2019)

#22

Post by Zenbit_UX »

JR1427 wrote: post #21
Zenbit_UX wrote: post #19

Earlier quoted context omitted.

There’s plenty, though please evaluate the veracity of their claims for yourself, I’m not a scientist nor do I excel at parsing scientific articles. Here’s one I’ve come across after a few minutes which references many others https://www.sciencedirect.com/science/article/abs/pii/S10111...

After a quick skim, that article seems to be talking about something other than typical age-related greying. More photobleaching.

From the conclusions:

> Sun radiation affects hair properties as color, luster, mechanical resistance, the content of proteins and others.

TLDR Yes it impacts color. Further reading can be found in the 75 studies that can be found in the references section.

Re: Is sunscreen the new margarine? (2019)

#23

Post by JR1427 »

Zenbit_UX wrote: post #22
JR1427 wrote: post #21

Earlier quoted context omitted.

After a quick skim, that article seems to be talking about something other than typical age-related greying. More photobleaching.

From the conclusions: > Sun radiation affects hair properties as color, luster, mechanical resistance, the content of proteins and others. TLDR Yes it impacts color. Further reading can be found in the 75 studies that can be found in the references section.

When most people think of age-related hair greying (which you referenced in your original post), they think of the phenomenon whereby hair follicles stop producing pigments that colour hair.

This is distinct from UV bleaching of the pigments in the hair.

Re: Is sunscreen the new margarine? (2019)

#24

Post by JR1427 »

Zenbit_UX wrote: post #22
JR1427 wrote: post #21

Earlier quoted context omitted.

After a quick skim, that article seems to be talking about something other than typical age-related greying. More photobleaching.

From the conclusions: > Sun radiation affects hair properties as color, luster, mechanical resistance, the content of proteins and others. TLDR Yes it impacts color. Further reading can be found in the 75 studies that can be found in the references section.

If hair greying was mostly caused by UV damage, I would expect that the pattern of greying would be even, and begin on the top of the head.

In contrast (based on my own unscientific observations!) greying typically begins in small areas, and often on the temples - not what I'd expect if caused by UV damage.

Re: Is sunscreen the new margarine? (2019)

#25

Post by abracadaniel »

d4ng wrote: post #18
poulpy123 wrote: post #17

[flagged]

TFA says that many sunscreens block radiation causing sunburn, rather than radiation causing cancer.

The US only just approved a new one for broad spectrum UV protection. That distinction has largely been a US only issue.

Re: Is sunscreen the new margarine? (2019)

#26

Post by flyingshelf »

sevenseacat wrote: post #14
Zenbit_UX wrote: post #8

Earlier quoted context omitted.

Worth noting here for any readers new to UV guidelines that the above rule isn’t necessarily helpful for you. I’m currently traveling in an area that is 8:30am-4:30pm and live in an area that’s 10-6 pm in the summer and shifts throughout the year. The actual rule is derived from your location’s safe UV index zones, which is found out by determining what local time the UV Index <= 2. Above 2, wear some amount of prote…

That's basically sun up to sun down, here. It's been completely grey, overcast, and raining here all day and the UV index sat between 3 and 5.

The worst sunburn I ever got was on a boat while overcast. I don't trust them clouds no more.

Re: Is sunscreen the new margarine? (2019)

#29

Post by dang »

Cockbrand wrote: post #16
jml7c5 wrote: post #12

(2019)

A bit unclear - it says > Weller’s largest study yet is due to be published later in 2019 But in the header, it also says > Updated May 31, 2024 I'd still love to know whether there has been further research in the meantime.

And https://web.archive.org/web/20260000000000*/https://www.outs... seems to suggest 2021. I guess we'll put that above, although we had 2019 in the 2022 thread (https://news.ycombinator.com/item?id=48715020) :)

Re: Is sunscreen the new margarine? (2019)

#30

Post by [deleted] »

Zenbit_UX wrote: post #10

The article seems to be a meta analysis of a bunch of conflicting research to support a narrative that we don’t really know shit. And fair, we don’t. But a couple of things we do know that weren’t covered - egregiously so - is that aging is UV damage. Sometimes called photoaging, wrinkles, sun spots, discoloration, fine lines, grey hair, all of that shit that you associate with someone visibly looking old is sun dama…

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