Can you get sunburnt or UV skin damage through car or home windows?
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When you’re in a car, train or bus, do you choose a seat to avoid being in the sun or do you like the sunny side?
You can definitely feel the sun’s heat through a window. But can you get sunburn or skin damage when in your car or inside with the windows closed?
Let’s look at how much UV (ultraviolet) radiation passes through different types of glass, how tinting can help block UV, and whether we need sunscreen when driving or indoors.
What’s the difference between UVA and UVB?
Of the total UV radiation that reaches Earth, about 95% is UVA and 5% is UVB.
UVB only reaches the upper layers of our skin but is the major cause of sunburn, cataracts and skin cancer.
UVA penetrates deeper into our skin and causes cell damage that leads to skin cancer.
Glass blocks UVA and UVB radiation differently
All glass used in house, office and car windows completely blocks UVB from passing through.
But only laminated glass can completely block UVA. UVA can pass through other glass used in car, house and office windows and cause skin damage, increasing the risk of cancer.
Car windscreens block UVA, but the side and rear windows don’t
A car’s front windscreen lets in lots of sunshine and light. Luckily it blocks 98% of UVA radiation because it is made of two layers of laminated glass.
But the side and rear car windows are made of tempered glass, which doesn’t completely block UVA. A study of 29 cars found a range from 4% to almost 56% of UVA passed through the side and rear windows.
The UVA protection was not related to the car’s age or cost, but to the type of glass, its colour and whether it has been tinted or coated in a protective film. Grey or bronze coloured glass, and window tinting, all increase UVA protection. Window tinting blocks around 95% of UVA radiation.
In a separate study from Saudi Arabia, researchers fitted drivers with a wearable radiation monitor. They found drivers were exposed to UV index ratings up to 3.5. (In Australia, sun protection is generally recommended when the UV index is 3 or above – at this level it takes pale skin about 20 minutes to burn.)
So if you have your windows tinted, you should not have to wear sunscreen in the car. But without tinted windows, you can accumulate skin damage.
UV exposure while driving increases skin cancer risk
Many people spend a lot of time in the car – for work, commuting, holiday travel and general transport. Repeated UVA radiation exposure through car side windows might go unnoticed, but it can affect our skin.
Indeed, skin cancer is more common on the driver’s side of the body. A study in the United States (where drivers sit on the left side) found more skin cancers on the left than the right side for the face, scalp, arm and leg, including 20 times more for the arm.
Another US study found this effect was higher in men. For melanoma in situ, an early form of melanoma, 74% of these cancers were on the on the left versus 26% on the right.
Earlier Australian studies reported more skin damage and more skin cancer on the right side.
Cataracts and other eye damage are also more common on the driver’s side of the body.
What about UV exposure through home or office windows?
We see UV damage from sunlight through our home windows in faded materials, furniture or plastics.
Most glass used in residential windows lets a lot of UVA pass through, between 45 and 75%.
Single-pane glass lets through the most UVA, while thicker, tinted or coated glass blocks more UVA.
The best options are laminated glass, or double-glazed, tinted windows that allow less than 1% of UVA through.
Skylights are made from laminated glass, which completely stops UVA from passing through.
Most office and commercial window glass has better UVA protection than residential windows, allowing less than 25% of UVA transmission. These windows are usually double-glazed and tinted, with reflective properties or UV-absorbent chemicals.
Some smart windows that reduce heat using chemical treatments to darken the glass can also block UVA.
So when should you wear sunscreen and sunglasses?
The biggest risk with skin damage while driving is having the windows down or your arm out the window in direct sun. Even untinted windows will reduce UVA exposure to some extent, so it’s better to have the car window up.
For home windows, window films or tint can increase UVA protection of single pane glass. UVA blocking by glass is similar to protection by sunscreen.
When you need to use sunscreen depends on your skin type, latitude and time of the year. In a car without tinted windows, you could burn after one hour in the middle of the day in summer, and two hours in the middle of a winter’s day.
But in the middle of the day next to a home window that allows more UVA to pass through, it could take only 30 minutes to burn in summer and one hour in winter.
When the UV index is above three, it is recommended you wear protective sunglasses while driving or next to a sunny window to avoid eye damage.
Theresa Larkin, Associate Professor of Medical Sciences, University of Wollongong
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Forks Over Knives: Flavor! – by Darshana Thacker
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It’s important to not have to choose too much between health and flavor, because the outcome will never be a good one, either for your health or your happiness. And what’s bad for your happiness will ultimately not work out and thus will be bad for your general health, so, the question becomes: how to get both?
This book handles that nicely, delivering plant-based dishes that are also incidentally oil-free, and also either gluten-free or else there’s an obvious easy substitution to make it such. The flavor here comes from the ingredients as a whole, including the main ingredients as well as seasonings.
On the downside, occasionally those ingredients may be a little obscure if you don’t live in, say, San Francisco, and the ingredients weren’t necessarily chosen for cooking on a budget, either.
However, in most cases for most people it will, at worse, inspire you to try using an ingredient you don’t usually use—so that’s a good result.
The recipes are very clear and easy to follow, although not all are illustrated, and the “ready in…” times are about as accurate as they are for any cookbook, that is to say, it’s the time in which it conceivably can be done if (like the author, a head chef) you have a team of sous-chefs who have done a bunch of prep for you (e.g. sweet potato does not normally come in ½” dice; it comes in sweet potatoes) and laid everything out in little bowls mise-en-place style, and also you know the procedure well enough to not have to stop, hesitate, check anything, wash anything, wait for water to boil or anything else to heat up, or so forth. In other words, if you’re on your own in your home kitchen with normal domestic appliances, it’s going to take a little longer than for a professional in a professional kitchen with professional help.
But don’t let that detract from the honestly very good recipes.
Bottom line: if you’d like to level-up your plant-based cooking, this will definitely make your dishes that bit better!
Click here to check out Forks Over Knives: Flavor!, and dig in!
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10 Great Exercises to Improve Your Eyesight
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If your eyesight has been declining a bit, all is not lost. Just like many other muscles in the body, the muscles of the eye—including those responsible for changing the focal length of your vision—can atrophy without exercise. So, without further ado, here are the exercises recommended:
The eyes (still) have it
- Blink for a minute: blink rapidly for 30–60 seconds to regulate blood circulation, lubricate your eyes, and prevent dryness.
- Rotate your head while staring ahead: turn your head in a circular motion while keeping your gaze straight ahead. This improves blood circulation to your eyes.
- Look to your right and left: slowly move your gaze from right to left while breathing. This one relaxes and stretches the eye muscles.
- Close your eyes and relax: close your eyes for at least 30 seconds to relax and strengthen your photoreceptor cells.
- Move your gaze in different directions: shift your gaze right-left, up-down, in circular motions, and trace a figure 8 with your eyes. This improves visual perception for both near- and far-sightedness.
- Close and open your eyes: tighten your eyes shut for 3–5 seconds, then open them. Repeat seven times to improve blood circulation and relax your eye muscles. ← 10almonds note: the duration makes this different from #4, so do try both!
- Push against your temples with your fingers: gently press your temples with your fingers for two seconds, then release. Repeat 4–5 times to improve fluid circulation in your eyes.
- Draw geometric figures with your gaze: use your eyes to trace shapes such as triangles, squares, and circles to enhance your eye coordination and muscle strength.
- Move your eyeballs up and down: close your eyes and slowly move your eyeballs up and down five times to stretch and relax the muscles ← 10almonds note: this seems to be the same as part of #5 and has a considerable overlap with #8, but we’re listing it anyway, or else everyone will wonder where #9 went!
- Strengthen near and far focusing: focus on your thumb 10 inches away for 10–15 seconds, then switch focus to an object 10–20 feet away. Repeat five times to improve focus adjustment ability.
By practicing these exercises daily, we are told that you can improve eye health and vision within a week.
For more on all these, plus visual demonstrations, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
Vision for Life, Revised Edition – by Dr. Meir Schneider
Take care!
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Future-Proof Your Brain
10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.
This is Kimberly Wilson. She’s a psychologist, not a doctor, and/but her speciality is neurophysiology and brain health.
Here’s what she wants us to know…
Avoid this very common killer
As you’re probably aware, the #1 killer in the US is heart disease, followed by COVID, which effectively pushed everything down a place. Thereafter, we see cancer, followed by accidental injuries, stroke, and dementia (including Alzheimer’s).
Over in the UK, where Wilson is from, dementia (including Alzheimer’s disease) is the #1 killer, followed by heart disease and then respiratory diseases (including COVID), and then stroke, then cancer.
As ever, what’s good for the heart is good for the brain, so many of the same interventions will help avoid both. With regard to some of the other differences in order, the reasons are mostly due to differences in the two countries’ healthcare systems and firearms laws.
It’s worth noting, though, that the leading cause of death in young people (aged 15–19) is suicide in the UK; in the US it’s nominally accidental injuries first (e.g. accidental shootings) with intentional suicide in the second spot.
In other words… Young or old, mental health is a serious health category that kills literally the most people in the UK, and also makes the top spots in the US.
Avoid the early killer
Given the demographics of most of our readership, chances are you’ve already lived past your teens and twenties. That’s not to say that suicide is no longer a risk, though, and it’s also worth noting that while mental health issues are invisible, they’re still physical illnesses (the brain is also an organ, after all!), so this isn’t something where you can simply “decide not to” and that’s you set, safe for life. So, please do continue to take good care in that regard.
We wrote about this previously, here:
How To Stay Alive (When You Really Don’t Want To)
Avoid the later killer
Wilson talks about how a recent survey found that…
- while nearly half of adults say dementia is the disease they fear most,
- only a third of those thought you could do anything to avoid it, and
- just 1% could name the 7 known risk factors.
Quick test: can you name the 7 known risk factors?
Please take a moment to actually try (this kind of mental stimulation is good in any case), and count them out on your fingers (or write them down), and then…
When you’re ready: click here to see the answer!
How many did you get? If you got them all, well done. If not, then well, now you know, so that’s good.
So, with those 7 things in mind, the first obvious advice is to take care of those things.
Taking an evidence-based medicine approach, Wilson recommends some specific interventions that will each improve one or more of those things, directly or indirectly:
Eating right
Wilson is a big fan of “nutritional psychiatry” and feeding one’s brain properly. We wrote about this, here:
The 6 Pillars Of Nutritional Psychiatry
As well as agreeing with the obvious “eat plenty of fiber, different-colored plants, and plenty of greens and beans”, Wilson specifically also champions getting enough of vitamins B9, B12, and D, as well as getting a healthy dose of omega-3 fatty acids.
She also recommends intermittent fasting, if that’s a reasonable option for you—but advocates for not worrying about it, if it’s not easy for you. For example, if you are diabetic, or have (or have a history with) some kind of eating disorder(s), then it’s probably not usefully practicable. But for most people, it can reduce systemic inflammation, which means also reducing neuroinflammation.
Managing stress right
Here she advocates for three main things:
- Mindful meditation (see: Evidence-Based, No-Frills Mindfulness)
- Psychological resilience (see: Building Psychological Resilience)
- Mindful social media use (see: Making Social Media Work For Your Mental Health)
Managing money right
Not often we talk about this in a health science publication as opposed to a financial planning publication, but the fact is that a lot of mental distress, which goes on to have a huge impact on the brain, is rooted in financial stresses.
And, of course, it’s good to be able to draw on financial resources to directly fund one’s good health, but that is the secondary consideration here—the financial stress is the biggest issue, and you can’t CBT your way out of debt, for example.
Therapists often face this, and what has been referred to informally by professionals in the field as “Shit Life Syndrome”—and there’s only so much that therapy can do about that.
We’re not a financial publication, but one recommendation we’ll drop is that if you don’t currently have budgeting software that you use, this writer personally uses and swears by YNAB (You Need A Budget), so maybe check that out if you don’t already have everything covered in that regard. It’s not free, but there is a 34-day free trial.
Therapy can be very worthwhile nonetheless
Wilson notes that therapy is like non-invasive brain surgery (because of neuroplasticity, it’s literally changing physical things in your brain).
It’s not a magic bullet and it’s not the right choice for everyone, but it’s worth considering, and even self-therapy can yield benefits for many:
The Gym For Your Mental Health: Getting The Most Out Of Therapy
Sleeping right
Sleep is not only critical for health in general and brain health in particular, it’s also most of when our glymphatic system does clean-up in the brain (essential for avoiding Alzheimer’s & Parkinson’s, amongst other diseases):
How To Clean Your Brain (Glymphatic Health Primer)
Want to know more from Kimberley Wilson?
We reviewed a book of hers recently, here:
Unprocessed: What your Diet Is Doing To Your Brain – by Kimberley Wilson
However, much of what we shared today was sourced from another book of hers that we haven’t reviewed yet but probably will do one of these days:
Enjoy!
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The Immunostimulant Superfood –
10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.
First, what this book is not: a “detox cleanse” book of the kind that claims you can flush out the autism if you just eat enough celery.
What it rather is: an overview brain chemistry, gut microbiota, and the very many other bodily systems that interact with these “two brains”.
She also does some mythbusting of popular misconceptions (for example with regard to tryptophan), and explains with good science just what exactly such substances as gluten and casein can and can’t do.
The format is less of a textbook and more a multipart (i.e., chapter-by-chapter) lecture, in pop-science style though, making it very readable. There are a lot of practical advices too, and options to look up foods by effect, and what to eat for/against assorted mental states.
Bottom line: anyone who eats food is, effectively, drugging themselves in one fashion or another—so you might as well make a conscious choice about how to do so.
Click here to check out This Is Your Brain On Food, and choose what kind of day you have!
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The Vitamin Solution – by Dr. Romy Block & Dr. Arielle Levitan
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A quick note: it would be remiss of us not to mention that the authors of this book are also the founders of a vitamin company, thus presenting a potential conflict of interest.
That said… In this reviewer’s opinion, the book does seem balanced and objective, regardless.
We talk a lot about supplements here at 10almonds, especially in our Monday Research Review editions. And yesterday, we featured a book by a doctor who hates supplements. Today, we feature a book by two doctors who have made them their business.
The authors cover all the most common vitamins and minerals popularly enjoyed as supplements, and examine:
- why people take them
- factors affecting whether they help
- problems that can arise
- complicating factors
The “complicating factors” include, for example, the way many vitamins and/or minerals interplay with each other, either by requiring the presence of another, or else competing for resources for absorption, or needing to be delicately balanced on pain of diverse woes.
This is the greatest value of the book, perhaps; it’s where most people go wrong with supplementation, if they go wrong.
While both authors are medical doctors, Dr. Romy Block is an endocrinologist specifically, and she clearly brought a lot of extra attention to relevant metabolic/thyroid issues, and how vitamins and minerals (such as thiamin and iron) can improve or sabotage such, depending on various factors that she explains. Informative, and so far as this reviewer could see, objective and well-balanced.
Bottom line: supplementation is a vast and complex topic, but this book does a fine job of demystifying and simplifying it in a clear and objective fashion, without resorting to either scaremongering or hype.
Click here to check out The Vitamin Solution, and upgrade your knowledge!
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Wildfires ignite infection risks, by weakening the body’s immune defences and spreading bugs in smoke
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Over the past several days, the world has watched on in shock as wildfires have devastated large parts of Los Angeles.
Beyond the obvious destruction – to landscapes, homes, businesses and more – fires at this scale have far-reaching effects on communities. A number of these concern human health.
We know fire can harm directly, causing injuries and death. Tragically, the death toll in LA is now at least 24.
But wildfires, or bushfires, can also have indirect consequences for human health. In particular, they can promote the incidence and spread of a range of infections.
Effects on the immune system
Most people appreciate that fires can cause burns and smoke inhalation, both of which can be life-threatening in their own right.
What’s perhaps less well known is that both burns and smoke inhalation can cause acute and chronic changes in the immune system. This can leave those affected vulnerable to infections at the time of the injury, and for years to come.
Burns induce profound changes in the immune system. Some parts go into overdrive, becoming too reactive and leading to hyper-inflammation. In the immediate aftermath of serious burns, this can contribute to sepsis and organ failure.
Other parts of the immune system appear to be suppressed. Our ability to recognise and fight off bugs can be compromised after sustaining burns. Research shows people who have experienced serious burns have an increased risk of influenza, pneumonia and other types of respiratory infections for at least the first five years after injury compared to people who haven’t experienced burns.
Wildfire smoke is a complex mixture containing particulate matter, volatile organic compounds, ozone, toxic gases, and microbes. When people inhale smoke during wildfires, each of these elements can play a role in increasing inflammation in the airways, which can lead to increased susceptibility to respiratory infections and asthma.
Research published after Australia’s Black Summer of 2019–20 found a higher risk of COVID infections in areas of New South Wales where bushfires had occurred weeks earlier.
We need more research to understand the magnitude of these increased risks, how long they persist after exposure, and the mechanisms. But these effects are thought to be due to sustained changes to the immune response.
Microbes travel in smoky air
Another opportunity for infection arises from the fire-induced movement of microbes from niches they usually occupy in soils and plants in natural areas, into densely populated urban areas.
Recent evidence from forest fires in Utah shows microbes, such as bacteria and fungal spores, can be transported in smoke. These microbes are associated with particles from the source, such as burned vegetation and soil.
There are thousands of different species of microbes in smoke, many of which are not common in background, non-smoky air.
Only a small number of studies on this have been published so far, but researchers have shown the majority of microbes in smoke are still alive and remain alive in smoke long enough to colonise the places where they eventually land.
How far specific microbes can be transported remains an open question, but fungi associated with smoke particles have been detected hundreds of miles downwind from wildfires, even weeks after the fire.
So does this cause human infections?
A subset of these airborne microbes are known to cause infections in humans.
Scientists are probing records of human fungal infections in relation to wildfire smoke exposure. In particular, they’re looking at soil-borne infectious agents such as the fungi Coccidioides immitis and Coccidioides posadasii which thrive in dry soils that can be picked up in dust and smoke plumes.
These fungi cause valley fever, a lung infection with symptoms that can resemble the flu, across arid western parts of the United States.
A study of wildland firefighters in California showed high rates of valley fever infections, which spurred occupational health warnings including recommended use of respirators when in endemic regions.
A California-based study of the wider population showed a 20% increase in hospital admissions for valley fever following any amount of exposure to wildfire smoke.
However, another found only limited evidence of excess cases after smoke exposure in wildfire-adjacent populations in California’s San Joaquin Valley.
These contrasting results show more research is needed to evaluate the infectious potential of wildfire smoke from this and other fungal and bacterial causes.
Staying safe
Much remains to be learned about the links between wildfires and infections, and the multiple pathways by which wildfires can increase the risk of certain infections.
There’s also a risk people gathering together after a disaster like this, such as in potentially overcrowded shelters, can increase the transmission of infections. We’ve seen this happen after previous natural disasters.
Despite the gaps in our knowledge, public health responses to wildfires should encompass infection prevention (such as through the provision of effective masks) and surveillance to enable early detection and effective management of any outbreaks.
Christine Carson, Senior Research Fellow, School of Medicine, The University of Western Australia and Leda Kobziar, Professor of Wildland Fire Science, University of Idaho
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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