Is Sunscreen the New Margarine?
04-19-19, 06:16 PM
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Margarine is very bad for your heart and arteries, and sunscreen is bad for your skin, it's best to avoid both of them.
04-20-19, 01:10 AM
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04-20-19, 05:42 AM
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I agree about margarine, my Mom used to cook with it during the 70's and it always made me break out in zits. Nasty stuff, butter is much healthier.
04-20-19, 08:29 AM
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Outside Magazine might not be the optimal information source for this.
There are pros and cons to sunscreen, but avoiding sunburn is the most important thing to do for avoiding skin cancers.
There are pros and cons to sunscreen, but avoiding sunburn is the most important thing to do for avoiding skin cancers.
04-20-19, 09:56 AM
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A few years ago a blood test revealed that I had a vitamin D deficiency. I started taking vitamin D supplements. As a result, I no longer have that deficiency. So what is the problem with vitamin D supplements?
04-20-19, 10:06 AM
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https://sciencebasedmedicine.org/vit...not-to-screen/
What evidence did they find on vitamin D?
Screening for vitamin D got the “I” statement: the USPSTF felt the evidence was insufficient for a variety of reasons. You can read their detailed reasoning and the research they based it on here, but here are the key points:- There is no consensus on the definition of vitamin D deficiency.
- There is no consensus on optimal levels.
- Testing methods are not standardized and results vary between laboratories.
- There are no studies evaluating the direct benefit of screening.
- There is adequate evidence that treatment of asymptomatic vitamin D deficiency has no benefit on cancer, diabetes, mortality, or even on fracture risk in persons not at high risk of fracture.
- There is inadequate evidence on the benefit for other outcomes including psychosocial and physical functioning.
- Although the evidence is adequate for a few limited outcomes, the overall evidence on the early treatment of asymptomatic, screen-detected vitamin D deficiency to improve health outcomes is inadequate.
- There are no studies evaluating the direct harms of screening.
- There is adequate evidence that the harms of treatment of vitamin D deficiency are small to none.
04-20-19, 10:35 AM
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There's been back and forth on vitamin D over the years. Not only studies, but differing medical professional associations taking/changing stances:
https://sciencebasedmedicine.org/?s=...&submit=Search
https://sciencebasedmedicine.org/?s=...&submit=Search
04-21-19, 12:17 AM
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High doses of vitamin D can cause renal failure.
Vitamin D and Renal Failure: How Much Is Too Much?
https://www.pharmacytimes.com/contri...ch-is-too-much
04-21-19, 11:16 PM
#35
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Considering there's no real consensus grounded in actual science what constitutes a "deficiency" in vitamin D....your freewill donation to the supplement-woo-industrial-complex was appreciated.
https://sciencebasedmedicine.org/vit...not-to-screen/
https://sciencebasedmedicine.org/vit...not-to-screen/
M.
04-22-19, 12:05 AM
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My dad suffered rickets as a kid. It affected his posture very noticeably and probably was the cause of his lifelong foot./shoe issues as well. He grew up outside Boston during the Depression at 42 degrees north. I strongly suspect that the 2000 units of D3 my last two doctors have recommended strongly would have made a big difference in his life. (But that would be just one data point.)
And on-topic. Last fall I had bloodwork done for my"doc". (She's actually a nurse. Very sharp. Her advice and medicines have been life-changing. I no longer have to take the expensive drugs I took for years.) Went in to see her and got a lecture on not taking my D. (I'd stopped for about a month and a half but hadn't told her.) Resumed taking it and very soon felt a lot better than I had been feeling. Again just one data point.
Ben
And on-topic. Last fall I had bloodwork done for my"doc". (She's actually a nurse. Very sharp. Her advice and medicines have been life-changing. I no longer have to take the expensive drugs I took for years.) Went in to see her and got a lecture on not taking my D. (I'd stopped for about a month and a half but hadn't told her.) Resumed taking it and very soon felt a lot better than I had been feeling. Again just one data point.
Ben
04-22-19, 01:15 AM
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I always assumed that what I read was true and that 10-15 minutes a day of sunlight would give a person all the Vitamin D they needed. Would it be possible, if you lived in, say, AZ or So Cal and spent a lot of time outside, you could get all you needed from the sun?
I know Portland can have lots of overcast days, and have daily rain or snow for weeks on end. Not a great place for Vitamin D absorption, but the average person's skin looks a lot better in old age than some farmer from Bakersfield who spent a lot of time outside. It's funny though, people still look old even without skin damage, so staying out of the sun will not spare your skin from aging.
I know Portland can have lots of overcast days, and have daily rain or snow for weeks on end. Not a great place for Vitamin D absorption, but the average person's skin looks a lot better in old age than some farmer from Bakersfield who spent a lot of time outside. It's funny though, people still look old even without skin damage, so staying out of the sun will not spare your skin from aging.
04-22-19, 03:31 AM
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I would say minimum of 30 minutes per day and you would also have to avoid sunscreen and expose large areas of your body and not just face and hands. Going outside to get vitamin D may not be practical for most people unless they work outside or bike commute, it's better to get vitamin D from food. Sorry for all the vegans, only certain animal foods have vitamin D.
04-22-19, 08:02 AM
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High doses of vitamin D can cause renal failure.
Vitamin D and Renal Failure: How Much Is Too Much?
https://www.pharmacytimes.com/contri...ch-is-too-much
04-22-19, 09:43 AM
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04-22-19, 11:23 AM
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My takeaway from @CycleryNorth81's link is that you have to be an idiot to overdose on Vitamin D.
Or buy into the megadose quackery. You can take a high dose for a while and feel just fine, the bad effects are cumulative.
Basically, unless you are a vegan, the likelihood is there's plenty of vitamin D in your diet.
Not sure why we're going into a vitamin D rabbit hole in this thread--the point made in the article was that taking vitamin D supplements and having good vitamin D blood levels didn't seem to mitigate the bad effects of too little sun exposure.
If we want to talk about this from an evolutionary perspective, our lack of fur could indicate there was some sort of biological advantage of having direct sunlight on skin. We're definitely different from other primates in this regard.
04-22-19, 11:27 AM
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My takeaway from @CycleryNorth81's link is that you have to be an idiot to overdose on Vitamin D.
04-22-19, 11:29 AM
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I would say minimum of 30 minutes per day and you would also have to avoid sunscreen and expose large areas of your body and not just face and hands. Going outside to get vitamin D may not be practical for most people unless they work outside or bike commute, it's better to get vitamin D from food. Sorry for all the vegans, only certain animal foods have vitamin D.
04-22-19, 11:31 AM
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04-22-19, 11:43 AM
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This is why you should dress like a farmer in the sunny months if you're out between 10 am and 5pm. Long sleeves with collars, gloves, wide brimmed hats. Pick routes with trees. As much as possible in shades lighter than your skin, unless it's a cold day, then darker. You will avoid almost all the negative effects of the sun, still stay cool through evaporative cooling.
04-22-19, 12:13 PM
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This is why you should dress like a farmer in the sunny months if you're out between 10 am and 5pm. Long sleeves with collars, gloves, wide brimmed hats. Pick routes with trees. As much as possible in shades lighter than your skin, unless it's a cold day, then darker. You will avoid almost all the negative effects of the sun, still stay cool through evaporative cooling.
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