3 ms·

Damaging high doses can be as little as a few minutes in the Australian summer so I think it's fair to keep that in mind. On your evolution comment, most Austr

by hnick 7y ago

Damaging high doses can be as little as a few minutes in the Australian summer so I think it's fair to keep that in mind. On your evolution comment, most Australians don't have dark skin, but the ones who were here before Europeans do. I think that is a good indicator that the body is adjusting to something harmful. On the other hand, many dark skinned people in Britain aren't in a climate they evolved for either. We all have to be mindful that people move around the world faster than evolution now and may need to adjust our habits.

piadodjanho 7y ago
Adding some information for those interested in more precise numbers. This paper [1] has the recommended exposure time for a few cities in Australia. If you live in the same latitude, as long you live in the same latitude, this can be used as a guideline. https://staging.mja.com.au/system/files/issues/194_07_040411/sta10598_fm.pdf https://staging.mja.com.au/system/files/issues/194_07_040411...
- hnick 7y ago
  I haven't kept up with the Ozone Hole lately, but I believe it's not uniformly distributed so keep that in mind too if it's still a problem. I'm pretty sure it was usually more of a problem in Australia than South America for example. I couldn't believe it the first time I went to Singapore, in 35C heat all day in the sun at a theme park, and didn't even get a minor blush on my pale skin due to the humidity and latitude. Definitely eye opening coming from NSW, Australia.
- stevesimmons 7y ago
  That's a really interesting link. From the table there, for example, in Townsville in summer, with 11% of your body exposed, it takes just 6 minutes to synthesis 1000 IU of vitamin D. A fair-skinned female friend who studied at James Cook University used to complain she got sunburnt walking between classes... So DWG, if you read this, apologies for telling you off for exaggerating!

by hnick 7y ago

piadodjanho 7y ago

Adding some information for those interested in more precise numbers. This paper [1] has the recommended exposure time for a few cities in Australia. If you live in the same latitude, as long you live in the same latitude, this can be used as a guideline. https://staging.mja.com.au/system/files/issues/194_07_040411/sta10598_fm.pdf https://staging.mja.com.au/system/files/issues/194_07_040411...

hnick 7y ago
I haven't kept up with the Ozone Hole lately, but I believe it's not uniformly distributed so keep that in mind too if it's still a problem. I'm pretty sure it was usually more of a problem in Australia than South America for example. I couldn't believe it the first time I went to Singapore, in 35C heat all day in the sun at a theme park, and didn't even get a minor blush on my pale skin due to the humidity and latitude. Definitely eye opening coming from NSW, Australia.
stevesimmons 7y ago
That's a really interesting link. From the table there, for example, in Townsville in summer, with 11% of your body exposed, it takes just 6 minutes to synthesis 1000 IU of vitamin D. A fair-skinned female friend who studied at James Cook University used to complain she got sunburnt walking between classes... So DWG, if you read this, apologies for telling you off for exaggerating!