Physical Sunscreen or Chemical Sunscreen – Which is Healthier?

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Our Verdict

When comparing physical sunscreens to chemical sunscreens, we picked the physical sunscreens.

Why?

It’s easy to vote against chemical sunscreens, because it has “chemical” in the name, which tends to be offputting PR-wise no matter how healthy something is.

But in this case, there’s actual science here too!

Physical sunscreens physically block the UV rays.

  • On the simplest of levels, mud is a physical sunscreen, as you can see widely used by elephants, hippos, pigs, and other animals.
  • On a more sophisticated level, modern physical sunscreens often use tiny zinc particles (or similar) to block the UV rays in a way that isn’t so obvious to the naked eye—so we can still see our skin, and it looks just like we applied an oil or other moisturizer.

Chemical sunscreens interact with the UV rays in a way that absorbs them.

  • Specifically, they usually convert it into relatively harmless thermal energy (heat)
  • However, this can cause problems if there’s too much heat!
  • Additionally, chemical sunscreens can get “used up” in a way that physical sunscreens can’t* becoming effectively deactivated once the chemical reaction has run its course and there is no more reagent left unreacted.
  • Worse, some of the reagents, when broken down by the UV rays, can potentially cause harm when absorbed by the skin.

*That said, physical sunscreens will still need “topping up” because we are a living organism and our body can’t resist redistributing and using stuff—plus, depending on the climate and our activities, we can lose some externally too.

Further reading

We wrote about sunscreens (of various kinds) here:

Who Screens The Sunscreens?

And you can also read specifically about today’s topic in more detail, here:

What’s The Difference Between Physical And Chemical Sunscreens?

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  • Squat Variations for Painful Knees (No More Pain!)

    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.

    Having bad knees can be a bit of a catch-22; you want to squat to make them stronger, but you can’t do that because your knees are not good. But, there are ways to do it!

    Dr. Alyssa Kuhn, a doctor of physical therapy, advises:

    Gently does it

    Ten ways to choose from:

    1. Pool Squats: performed in a pool for joint-friendly support. Can use both hands, one hand, or no support. Focus on sitting back and standing up, aiming for 10–20 reps.
    2. Supported Squats: use a sink, rings, or handles for support. Stand a distance away and sit back while keeping your knees behind your heels. Perform 10–20 reps for 2–3 sets.
    3. Chair Loop Squats: use a resistance band around your knees while sitting on a chair. Press your knees outward as you stand and sit to strengthen hip and knee stability. Do 8–12 reps for 2–3 sets.
    4. Heel Elevated Squats: place your heels on dumbbells to shift emphasis to thighs and reduce knee strain. Ideal for stiff ankles or back tightness. Perform 10–15 reps for 2–3 sets.
    5. Sumo Squats: a wide stance squat, good for hip strength and reducing knee stress. Adjust your foot positioning for comfort. Perform 15–20 reps for 2–3 sets.
    6. Chair Squats: hold a weight close to your chest while sitting and standing from a chair. Can use kettlebells or dumbbells. Do 8–10 reps for 2–3 sets.
    7. Band Squats: use a resistance band secured behind your knees to provide support and encourage proper squat mechanics. Perform 5–12 reps for 2–3 sets.
    8. Modified Single Leg Squat: sit-to-stand using one leg with the other as a kickstand. Adjust your foot position for difficulty. Perform 8–12 reps per side for 2–3 sets.
    9. Weighted Squats: add weight using dumbbells or a barbell. Maintain an upright torso. Adjust the weight and reps based on difficulty, and do 5–10 reps for 2–4 sets.
    10. Split Squat: a stationary lunge, keeping your feet in place and lowering straight down. Focus on your front leg while keeping balance. Can add weight if you want. Perform 5–12 reps per side based on difficulty.

    For more on each of 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:

    The Squat Bible: The Ultimate Guide to Mastering the Squat and Finding Your True Strength – by Dr. Aaron Horschig

    Take care!

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  • Pneumonia: Prevention Is Better Than Cure

    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.

    Pneumonia: What We Can & Can’t Do About It

    Pneumonia is a significant killer of persons over the age of 65, with the risk increasing with age after that, rising very sharply around the age of 85:

    QuickStats: Death Rates from Influenza and Pneumonia Among Persons Aged ≥65 Years, by Sex and Age Group

    While pneumonia is treatable, especially in young healthy adults, the risks get more severe in the older age brackets, and it’s often the case that someone goes into hospital with one thing, then develops pneumonia, which the person was already not in good physical shape to fight, because of whatever hospitalized them in the first place:

    American Lung Association | Pneumonia Treatment and Recovery

    Other risk factors besides age

    There are a lot of things that can increase our risk factor for pneumonia; they mainly fall into the following categories:

    • Autoimmune diseases
    • Other diseases of the immune system (e.g. HIV)
    • Medication-mediated immunosuppression (e.g. after an organ transplant)
    • Chronic lung diseases (e.g. asthma, COPD, Long Covid, emphysema, etc)
    • Other serious health conditions ← we know this one’s broad, but it encompasses such things as diabetes, heart disease, and cancer

    See also:

    Why Chronic Obstructive Pulmonary Disease (COPD) Is More Likely Than You Think

    Things we can do about it

    When it comes to risks, we can’t do much about our age and some of the other above factors, but there are other things we can do to reduce our risk, including:

    • Get vaccinated against pneumonia if you are over 65 and/or have one of the aforementioned risk factors. This is not perfect (it only reduces the risk for certain kinds of infection) and may not be advisable for everyone (like most vaccines, it can put the body through its paces a bit after taking it), so speak with your own doctor about this, of course.
    • Avoid contagion. While pneumonia itself is not spread person-to-person, it is caused by bacteria or viruses (there are numerous kinds) that are opportunistic and often become a secondary infection when the immune system is already busy with the first one. So, if possible avoid being in confined spaces with many people, and do wash your hands regularly (as a lot of germs are transferred that way and can get into the respiratory tract because you touched your face or such).
    • If you have a cold, or flu, or other respiratory infection, take it seriously, rest well, drink fluids, get good immune-boosting nutrients. There’s no such thing as “just a cold”; not anymore.
    • Look after your general health too—health doesn’t exist in a vacuum, and nor does disease. Every part of us affects every other part of us, so anything that can be in good order, you want to be in good order.

    This last one, by the way? It’s an important reminder that while some diseases (such as some of the respiratory infections that can precede pneumonia) are seasonal, good health isn’t.

    We need to take care of our health as best we can every day along the way, because we never know when something could change.

    Want to do more?

    Check out: Seven Things To Do For Good Lung Health!

    Take care!

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  • 8 Critical Signs Of Blood Clots That You Shouldn’t Ignore

    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.

    Blood clots can form as part of deep vein thrombosis or for other reasons; wherever they form (unless they are just doing their job healing a wound) they can cause problems. But how to know what’s going on inside our body?

    Telltale signs

    Our usual medical/legal disclaimer applies here, and we are not doctors, let alone your doctors, and even if we were we couldn’t diagnose from afar… But for educational purposes, here are the eight signs from the video:

    • Swelling: especially if only on one leg (assuming you have no injury to account for it), which may feel tight and uncomfortable
    • Warmness: does the area warmer to the touch? This may be because of the body’s inflammatory response trying to deal with a blood clot
    • Tenderness: again, caused by the inflammation in response to the clot
    • Discolored skin: it could be reddish, or bruise-like. This could be patchy or spread over a larger area, because of a clot blocking the flow of blood
    • Shortness of breath: if a clot makes it to the lungs, it can cause extra problems there (pulmonary embolism), and shortness of breath is the first sign of this
    • Coughing up blood: less common than the above but a much more serious sign; get thee to a hospital
    • Chest pain: a sharp or stabbing pain, in particular. The pain may worsen with deep breaths or coughing. Again, seek medical attention.

    For more on recognizing these signs (including helpful visuals), and more on what to do about them and how to avoid them in the first place, enjoy:

    Click Here If The Embedded Video Doesn’t Load Automatically!

    Further reading

    You might like to read:

    Dietary Changes for Artery Health

    Take care!

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Related Posts

  • Dandelion Greens vs Collard Greens – Which is Healthier?
  • Rainbow Roasted Potato Salad

    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 salad has potatoes in it, but it’s not a potato salad as most people know it. The potatoes are roasted, but in a non-oily-dressing, that nevertheless leaves them with an amazing texture—healthy and delicious; the best of both worlds. And the rest? We’ve got colorful vegetables, we’ve got protein, we’ve got seasonings full of healthy spices, and more.

    You will need

    • 1½ lbs new potatoes (or any waxy potatoes; sweet potato is also a great option; don’t peel them, whichever you choose) cut into 1″ chunks
    • 1 can / 1 cup cooked cannellini beans (or your preferred salad beans)
    • 1 carrot, grated
    • 2 celery stalks, finely chopped
    • 3 spring onions, finely chopped
    • ½ small red onion, finely sliced
    • 2 tbsp white wine vinegar
    • 1 tbsp balsamic vinegar
    • 1 tbsp lemon juice
    • 1 tbsp nutritional yeast
    • 1 tsp garlic powder
    • 1 tsp black pepper
    • ½ tsp red chili powder
    • We didn’t forget salt; it’s just that with the natural sodium content of the potatoes plus the savory flavor-enhancing properties of the nutritional yeast, it’s really not needed here. Add if you feel strongly about it, opting for low-sodium salt, or MSG (which has even less sodium).
    • To serve: 1 cup basil pesto (we’ll do a recipe one of these days; meanwhile, store-bought is fine, or you can use the chermoula we made the other day, ignoring the rest of that day’s recipe and just making the chermoula component)

    Method

    (we suggest you read everything at least once before doing anything)

    1) Preheat the oven as hot as it goes!

    2) Combine the potatoes, white wine vinegar, nutritional yeast, garlic powder, black pepper, and red chili powder, mixing thoroughly (but gently!) to coat.

    3) Spread the potatoes on a baking tray, and roast in the middle of the oven (for best evenness of cooking); because of the small size of the potato chunks, this should only take about 25 minutes (±5mins depending on your oven); it’s good to turn them halfway through, or at least jiggle them if you don’t want to do all that turning.

    4) Allow to cool while still on the baking tray (this allows the steam to escape immediately, rather than the steam steaming the other potatoes, as it would if you put them in a bowl).

    5) Now put them in a serving bowl, and mix in the beans, vegetables, balsamic vinegar, and lemon juice, mixing thoroughly but gently

    6) Add generous lashings of the pesto to serve; it should be gently mixed a little too, so that it’s not all on top.

    Enjoy!

    Want to learn more?

    For those interested in some of the science of what we have going on today:

    Take care!

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  • Feminist narratives are being hijacked to market medical tests not backed by evidence

    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.

    Corporations have used feminist language to promote their products for decades. In the 1980s, companies co-opted messaging about female autonomy to encourage women’s consumption of unhealthy commodities, such as tobacco and alcohol.

    Today, feminist narratives around empowerment and women’s rights are being co-opted to market interventions that are not backed by evidence across many areas of women’s health. This includes by commercial companies, industry, mass media and well-intentioned advocacy groups.

    Some of these health technologies, tests and treatments are useful in certain situations and can be very beneficial to some women.

    However, promoting them to a large group of asymptomatic healthy women that are unlikely to benefit, or without being transparent about the limitations, runs the risk of causing more harm than good. This includes inappropriate medicalisation, overdiagnosis and overtreatment.

    In our analysis published today in the BMJ, we examine this phenomenon in two current examples: the anti-mullerian hormone (AMH) test and breast density notification.

    The AMH test

    The AMH test is a blood test associated with the number of eggs in a woman’s ovaries and is sometimes referred to as the “egg timer” test.

    Although often used in fertility treatment, the AMH test cannot reliably predict the likelihood of pregnancy, timing to pregnancy or specific age of menopause. The American College of Obstetricians and Gynaecologists therefore strongly discourages testing for women not seeking fertility treatment.

    Woman sits in a medical waiting room
    The AMH test can’t predict your chance of getting pregnant.
    Anastasia Vityukova/Unsplash

    Despite this, several fertility clinics and online companies market the AMH test to women not even trying to get pregnant. Some use feminist rhetoric promising empowerment, selling the test as a way to gain personalised insights into your fertility. For example, “you deserve to know your reproductive potential”, “be proactive about your fertility” and “knowing your numbers will empower you to make the best decisions when family planning”.

    The use of feminist marketing makes these companies appear socially progressive and champions of female health. But they are selling a test that has no proven benefit outside of IVF and cannot inform women about their current or future fertility.

    Our recent study found around 30% of women having an AMH test in Australia may be having it for these reasons.

    Misleading women to believe that the test can reliably predict fertility can create a false sense of security about delaying pregnancy. It can also create unnecessary anxiety, pressure to freeze eggs, conceive earlier than desired, or start fertility treatment when it may not be needed.

    While some companies mention the test’s limitations if you read on, they are glossed over and contradicted by the calls to be proactive and messages of empowerment.

    Breast density notification

    Breast density is one of several independent risk factors for breast cancer. It’s also harder to see cancer on a mammogram image of breasts with high amounts of dense tissue than breasts with a greater proportion of fatty tissue.

    While estimates vary, approximately 25–50% of women in the breast screening population have dense breasts.

    Young woman has mammogram
    Dense breasts can make it harder to detect cancer.
    Tyler Olsen/Shutterstock

    Stemming from valid concerns about the increased risk of cancer, advocacy efforts have used feminist language around women’s right to know such as “women need to know the truth” and “women can handle the truth” to argue for widespread breast density notification.

    However, this simplistic messaging overlooks that this is a complex issue and that more data is still needed on whether the benefits of notifying and providing additional screening or tests to women with dense breasts outweigh the harms.

    Additional tests (ultrasound or MRI) are now being recommended for women with dense breasts as they have the ability to detect more cancer. Yet, there is no or little mention of the lack of robust evidence showing that it prevents breast cancer deaths. These extra tests also have out-of-pocket costs and high rates of false-positive results.

    Large international advocacy groups are also sponsored by companies that will financially benefit from women being notified.

    While stronger patient autonomy is vital, campaigning for breast density notification without stating the limitations or unclear evidence of benefit may go against the empowerment being sought.

    Ensuring feminism isn’t hijacked

    Increased awareness and advocacy in women’s health are key to overcoming sex inequalities in health care.

    But we need to ensure the goals of feminist health advocacy aren’t undermined through commercially driven use of feminist language pushing care that isn’t based on evidence. This includes more transparency about the risks and uncertainties of health technologies, tests and treatments and greater scrutiny of conflicts of interests.

    Health professionals and governments must also ensure that easily understood, balanced information based on high quality scientific evidence is available. This will enable women to make more informed decisions about their health.The Conversation

    Brooke Nickel, NHMRC Emerging Leader Research Fellow, University of Sydney and Tessa Copp, NHMRC Emerging Leader Research Fellow, University of Sydney

    This article is republished from The Conversation under a Creative Commons license. Read the original article.

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  • How Much Alcohol Does It Take To Increase Cancer Risk?

    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.

    Alcohol is, of course, unhealthy. Not even the famous “small glass of red” is recommended:

    Can We Drink To Good Health?

    Alcohol also increases all-cause mortality at any dose (even “low-risk drinking”):

    Alcohol Consumption Patterns and Mortality Among Older Adults

    …and the World Health Organization has declared that the only safe amount of alcohol is zero:

    WHO: No level of alcohol consumption is safe for our health

    But what of alcohol and cancer? According to the American Association of Cancer Research’s latest report, more than half of Americans do not know that alcohol increases the risk of cancer:

    Source: AACR Cancer Progress Report

    Why/how does alcohol increase the risk of cancer?

    There’s an obvious aspect and a less obvious but very important aspect:

    • The obvious: alcohol damages almost every system in the body, and so it’s little surprise if that includes systems whose job it is to keep us safe from cancer.
    • The less obvious: alcohol is largely metabolized by certain enzymes that have an impact on DNA repair, such as alcohol dehydrogenases and aldehyde dehydrogenases, amongst others, and noteworthily, acetaldehyde (the main metabolite of alcohol) is itself genotoxic.

    Read more: Alcohol & Cancer

    This is important, because it means alcohol also increases the risk of cancers other than the obvious head/neck, laryngeal, esophageal, liver, and colorectal cancers.

    However, those cancers are of course the most well-represented of alcohol-related cancers, along with breast cancer (this has to do with alcohol’s effect on estrogen metabolism).

    If you’re curious about the numbers, and the changes in risk if one reduces/quits/reprises drinking:

    ❝The increased alcohol-related cancer incidence was associated with dose; those who changed from nondrinking to mild (adjusted hazard ratio [aHR], 1.03; 95% CI, 1.00-1.06), moderate (aHR, 1.10; 95% CI, 1.02-1.18), or heavy (aHR, 1.34; 95% CI, 1.23-1.45) drinking levels had an associated higher risk than those who did not drink.

    Those with mild drinking levels who quit drinking had a lower risk of alcohol-related cancer (aHR, 0.96; 95% CI, 0.92-0.99) than those who sustained their drinking levels.

    Those with moderate (aHR, 1.07; 95% CI, 1.03-1.12) or heavy (aHR, 1.07; 95% CI, 1.02-1.12) drinking levels who quit drinking had a higher all cancer incidence than those who sustained their levels, but when quitting was sustained, this increase in risk disappeared.

    Results of this study showed that increased alcohol consumption was associated with higher risks for alcohol-related and all cancers, whereas sustained quitting and reduced drinking were associated with lower risks of alcohol-related and all cancers.

    Alcohol cessation and reduction should be reinforced for the prevention of cancer.❞

    Source: Association Between Changes in Alcohol Consumption and Cancer Risk

    Worried it’s too late?

    If you’re reading this (and thus, evidently, still alive), it isn’t. It’s never too late (nor too early) to reduce, or ideally stop, drinking. Even if you already have cancer, drinking more alcohol will only exacerbate things, and abstaining from alcohol will improve your chances of recovery.

    For a reassuring timeline of recovery from alcohol-related damage, see:

    What Happens To Your Body When You Stop Drinking Alcohol

    Want to stop, but have tried before and find it daunting?

    There are a few ways to make it a lot easier:

    Rethinking Drinking: How To Reduce Or Quit Alcohol

    Take care!

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