Yes, you still need to use sunscreen, despite what you’ve heard on TikTok
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Summer is nearly here. But rather than getting out the sunscreen, some TikTokers are urging followers to chuck it out and go sunscreen-free.
They claim it’s healthier to forgo sunscreen to get the full benefits of sunshine.
Here’s the science really says.
How does sunscreen work?
Because of Australia’s extreme UV environment, most people with pale to olive skin or other risk factors for skin cancer need to protect themselves. Applying sunscreen is a key method of protecting areas not easily covered by clothes.
Sunscreen works by absorbing or scattering UV rays before they can enter your skin and damage DNA or supportive structures such as collagen.
When UV particles hit DNA, the excess energy can damage our DNA. This damage can be repaired, but if the cell divides before the mistake is fixed, it causes a mutation that can lead to skin cancers.
The most common skin cancers are basal cell carcinoma (BCC) and squamous cell carcinoma (SCC). Melanoma is less common, but is the most likely to spread around the body; this process is called metastasis.
Two in three Australians will have at least one skin cancer in their lifetime, and they make up 80% of all cancers in Australia.
Around 99% of skin cancers in Australia are caused by excessive exposure to UV radiation.
Excessive exposure to UV radiation also affects the appearance of your skin. UVA rays are able to penetrate deep into the skin, where they break down supportive structures such as elastin and collagen.
This causes signs of premature ageing, such as deep wrinkling, brown or white blotches, and broken capillaries.
Sunscreen can help prevent skin cancers
Used consistently, sunscreen reduces your risk of skin cancer and slows skin ageing.
In a Queensland study, participants either used sunscreen daily for almost five years, or continued their usual use.
At the end of five years, the daily-use group had reduced their risk of squamous cell carcinoma by 40% compared to the other group.
Ten years later, the daily use group had reduced their risk of invasive melanoma by 73%
Does sunscreen block the health-promoting properties of sunlight?
The answer is a bit more complicated, and involves personalised risk versus benefit trade-offs.
First, the good news: there are many health benefits of spending time in the sun that don’t rely on exposure to UV radiation and aren’t affected by sunscreen use.
Sunscreen only filters UV rays, not visible light or infrared light (which we feel as heat). And importantly, some of the benefits of sunlight are obtained via the eyes.
Visible light improves mood and regulates circadian rhythm (which influences your sleep-wake cycle), and probably reduces myopia (short-sightedness) in children.
Infrared light is being investigated as a treatment for several skin, neurological, psychiatric and autoimmune disorders.
So what is the benefit of exposing skin to UV radiation?
Exposing the skin to the sun produces vitamin D, which is critical for healthy bones and muscles.
Vitamin D deficiency is surprisingly common among Australians, peaking in Victoria at 49% in winter and being lowest in Queensland at 6% in summer.
Luckily, people who are careful about sun protection can avoid vitamin D deficiency by taking a supplement.
Exposing the skin to UV radiation might have benefits independent of vitamin D production, but these are not proven. It might reduce the risk of autoimmune diseases such as multiple sclerosis or cause release of a chemical that could reduce blood pressure. However, there is not enough detail about these benefits to know whether sunscreen would be a problem.
What does this mean for you?
There are some benefits of exposing the skin to UV radiation that might be blunted by sunscreen. Whether it’s worth foregoing those benefits to avoid skin cancer depends on how susceptible you are to skin cancer.
If you have pale skin or other factors that increase you risk of skin cancer, you should aim to apply sunscreen daily on all days when the UV index is forecast to reach 3.
If you have darker skin that rarely or never burns, you can go without daily sunscreen – although you will still need protection during extended times outdoors.
For now, the balance of evidence suggests it’s better for people who are susceptible to skin cancer to continue with sun protection practices, with vitamin D supplementation if needed.
Katie Lee, PhD Candidate, Dermatology Research Centre, The University of Queensland and Rachel Neale, Principal research fellow, QIMR Berghofer Medical Research Institute
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Clean – by Dr. James Hamblin
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Our skin is our largest organ, and it’s easy to forget that, and how much it does for us. All things considered, it’s good to take good care of it! But what if we sometimes take too much “care” of it?
Dr. James Hamblin, a medical doctor-turned-writer, has explored this a lot both personally and in research. Through such, he has come to the conclusion there’s definitely a “sweet spot” of personal hygiene:
- Too little, and the Bubonic plague sweeps through Europe, or other plagues sweep through other places when European invaders came.
- Too much, and we strip our skin of one of its greatest qualities: the ability to protect us.
Dr. Hamblin asks (and answers) such questions as:
- What is good hygiene, and what is neurotically doing ourselves multiple levels of harm because advertising companies shamed us into doing so?
- Is it good or bad to use a series of products, each to undo the problem caused by the previous?
- What the difference between a 5-step skincare routine, and a series of gratuitous iatrogenic damage?
- Which products clean us most helpfully, and which clean us most harmfully?
- How often should we bathe/shower, really?
If the book has a weak point, it’s that it’s written mostly with his body in mind. That makes a difference when it comes to hairwashing, for example. He’s a white guy with short hair. If you’re black and/or have long hair, for example, your haircare needs will be quite different. Similarly, many women engage in shaving/depilation in places that most men don’t, and the consequences of that choice (and implications for any extra washing needs/harms) aren’t covered.
Bottom line: notwithstanding the aforementioned blind-spots, this book will help readers reduce the amount of harm we are doing to our bodies with our washing routines, without sacrificing actual hygiene.
Click here to check out Clean and help your skin to help you!
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The Herbal Supplement That Rivals Prozac
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Flower Power: St. John’s Wort’s Drug-Level Effectiveness
St. John’s wort is a small yellow flower, extract of which can be bought inexpensively off-the-shelf in pretty much any pharmacy in most places.
It’s sold and used as a herbal mood-brightener.
Does it work?
Yes! It’s actually very effective. This is really uncontroversial, so we’ll keep it brief.
The main findings of studies are that St. John’s wort not only gives significant benefits over placebo, but also works about as well as prescription anti-depressants:
A systematic review of St. John’s wort for major depressive disorder
They also found that fewer people stop taking it, compared to how many stop taking antidepressants. It’s not known how much of this is because of its inexpensive, freely-accessible nature, and how much might be because it gave them fewer adverse side effects:
Clinical use of Hypericum perforatum (St John’s wort) in depression: A meta-analysis
How does it work?
First and foremost, it’s an SSRI—a selective serotonin reuptake inhibitor. Basically, it doesn’t add serotonin, but it makes whatever serotonin you have, last longer. Same as most prescription antidepressants. It also affects adenosine and GABA pathways, which in lay terms, means it promotes feelings of relaxation, in a similar way to many prescription antianxiety medications.
Mechanism of action of St John’s wort in depression: what is known?
Any problems we should know about?
Yes, definitely. To quote directly from the National Center for Complementary and Integrative Health:
St. John’s wort can weaken the effects of many medicines, including crucially important medicines such as:
- Antidepressants
- Birth control pills
- Cyclosporine, which prevents the body from rejecting transplanted organs
- Some heart medications, including digoxin and ivabradine
- Some HIV drugs, including indinavir and nevirapine
- Some cancer medications, including irinotecan and imatinib
- Warfarin, an anticoagulant (blood thinner)
- Certain statins, including simvastatin
I’ve read all that, and want to try it!
As ever, we don’t sell it (or anything else), but here’s an example product on Amazon.
Please be safe and do check with your doctor and/or pharmacist, though!
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Is Unnoticed Environmental Mold Harming Your Health?
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Environmental mold can be a lot more than just the famously toxic black mold that sometimes makes the headlines, and many kinds you might not notice, but it can colonizes your sinuses and gut just the same:
Breaking the mold
Around 25% of homes in North America are estimated to have mold, though the actual number is likely to be higher, affecting both older and new homes. For that matter, mold can grow in unexpected areas, like inside air conditioning units, even in dry regions.
If mold just sat where it is minding its own business, it might not be so bad, but instead they release their spores, which are de facto airborne mycotoxins, which can colonize places like the sinuses or gut, causing significant health issues.
Not everyone in the same household is affected the same way by mold due to genetic differences and varying pre-existing health conditions. But as a general rule of thumb, mold inflames the brain, nerves, gut, and skin, and can negatively impact the vagal nerve, which is linked to the gut-brain connection. Mycotoxins also damage mitochondria, leading to symptoms like fatigue, brain fog, and cognitive issues. To complicate matters further, mold illness can mimic other conditions like anxiety, chronic fatigue, fibromyalgia, IBS, and more, making it difficult to diagnose.
Testing is possible, though they all have limitations, e.g:
- Home testing: testing the home for mold spores and mycotoxins is crucial for effective treatment; professional mold remediation companies are a good idea (to do a thorough job of cleaning, without also breathing in half the mold while cleaning it).
- Mold allergy testing: mold allergy testing (IgE testing or skin tests) is often used, but it doesn’t diagnose mold-related illnesses linked to severe symptoms like fatigue or neurodegeneration.
- Serum antibody testing: tests for immune reactions (IgG) to mycotoxins may not always show positive results if the immune system is weakened by long-term exposure.
- Urine mycotoxin testing: urine tests can detect mycotoxins in the body, though are likely to be more expensive, being probably not covered by public health in Canada or insurance in the US.
- Organic acid testing: this urine test can indicate mold colonization in areas like the sinuses or gut. Again, cost/availability may vary, though.
For more information on all of this, enjoy:
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Avoiding Anemia (More Than Just “Get More Iron”)
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The Iron Dilemma: Factors To Consider
Anemia affects around 10% of American seniors, and that number jumps to 34–39% if there’s a comorbidity such as diabetes, hypertension, or hypercholesterolemia, which in turn climbs with increasing age or with other chronic conditions:
So, what can we do about it?
Get iron yes, but how?
We’d be remiss not to say: yes, do of course make sure you get plenty of iron.
Most people know that red meats, which are terrible for the heart and for cancer risk, are good sources of iron.
Well, good insofar as they provide plenty of it! They’re bad for other reasons.
❝Studies consistently show that consumption of red meat has been contributory to a multitude of chronic conditions such as diabetes, CVD, and malignancies.
There are various emerging reasons that strengthen this link-from the basic constituents of red meat like the heme iron component, the metabolic reactions that take place after consumption, and finally to the methods used to cook it.
The causative links show that even occasional use raises the risk of T2DM.❞
Source: Red Meat Consumption (Heme Iron Intake) and Risk for Diabetes and Comorbidities?
To heme or not to heme
Did you catch that in the middle there, about the heme iron component?
Dietary iron is broadly divided into two kinds: heme, and non-heme.
- Heme iron comes from animals
- Non-heme iron comes from plants
Bad news for vegans: non-heme iron is not so easily absorbed as heme iron.
This means that if you’re just eating plants, the RDA may be significantly lowballing the amount actually required. As a rule, about 1.8x more iron may be needed for vegans, to compensate for it being less easily absorbed.
Why this happens: it’s because of the phytic acid / phytate in the plants that contain the iron, blocking its absorption.
Good news for vegans: however, taking iron with vitamin C increases its absorption rate by about 5x better absorption, and several other side-along nutrients do similarly, including allium (from garlic), carotenoids (from many colorful plants), and fermented foods.
Why this happens: it’s because they bind with similar sites as phytic acid, without causing the same effect. To make a metaphor: these foods steal phytic acid’s parking space, so phytic acid can’t do its iron-blocking thing.
By happy coincidence, today’s featured recipe has all of these things in, by the way (vitamin C, allium, carotenoids, and fermented foods), and the star ingredient (fava beans) is a rich source of iron.
What are good sources of iron, then?
In the category of plants:
- Beans (pick your favorites / eat a variety)
- Lentils (pick your favorites / eat a variety)
- Greens (especially dark leafy greens)
- Apricots (you can get these dried, for convenience!)
- Dark chocolate (5mg per 1oz square!)*
*Ok, technically dark chocolate is not a plant; cacao is a plant; dark chocolate is usually plant-based, though, as there is no reason to add milk.
In the category of dairy products:
That’s not a publication error; dairy products are just not great for iron. Cheeses are more nutrient-dense than milk, and have less than 0.5mg per oz, in other words, the top dairy product has around 10x less iron than dark chocolate, which came in 5th place and let’s face it, we were doing broad categories there. If we listed all the beans, lentils, greens, etc it’d be a much longer list.
Eggs, which are sometimes considered under the category of dairy by virtue of not being an animal (yet!) but an animal product, have around 1mg per egg, by the way, so considering eggs are nearer 2oz, that’s not much better than the cheese.
“But what about if…”
The above is good science and general good advice for most people. That said, some people may have conditions that preclude the foods we recommended, or have other considerations, and so things may be different. Anemia can sometimes be caused by things that can’t be fixed by diet (beyond the scope of today’s article; another time, perhaps), but for example, if you have leukemia then definitely discuss things with your doctors first. Other illnesses, and some medications, can also have troublesome effects that can contribute to anemia. Again, we can offer very good general information here, but we don’t know your medical history, and our standard legal/medical disclaimer applies as always.
See also: Do We Need Animal Products To Be Healthy?
Take care!
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How To En-Joy Life (With Long-Term Benefits)
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New Year’s Dissolutions?
We have talked previously about:
The Science Of New Year’s Pre-Resolutions
…and here we are now at the end of the first week of January; how’s it going?
Hopefully, based on that article, it’s been going just great since December! For most people, statistically speaking, it hasn’t.
Around now is typically when many people enter the “bargaining” stage of New Year’s Resolutions, which at this point are often in serious danger of becoming New Year’s Dissolutions.
What’s important, really?
When trying to juggle potentially too many new items, it’s important to be able to decide where to focus one’s efforts in the case of needing to drop a ball or two.
First, the laziest way…
The path of least resistance
This is perhaps most people’s go-to. It, without too much thought, drops whatever feels most onerous, and continues with what seems easiest.
This is not a terrible approach, because what we enjoy, we will be more likely to continue. But it can be improved upon, while still getting that benefit.
Marie Kondo your
resolutionsvaluesInstead of throwing out the new habits that “don’t spark joy”, ask yourself:
“What brings me joy?”
…because often, the answer is something that’s a result of a thing that didn’t “spark joy” directly. Many things in life involve delayed gratification.
Let’s separate the [unwanted action] from the [wanted result] for a moment.
Rather than struggling on with something unpleasant for the hope of joy at the end of the rainbow, though, give yourself permission to improve the middle bit.
For example, if the idea of having lots of energy and good cardiovascular fitness is what prompted you to commit to those 6am runs each morning (but they’re not actually joyous in your experience), what would be more fun and still give you the same benefit?
Now that you know “having lots of energy and good CV fitness” is what sparks joy, not “getting up to run at 6am”, you can change lanes without pulling off the highway entirely.
Maybe a dance class will be more your speed, for example.
The key here is: you’ll have changed your resolution, without breaking it in any way that mattered
Want more ways to keep on track without burning out?
Who doesn’t? So, check out:
How To Keep On Keeping On… Long Term!
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Peas vs Broad Beans – Which is Healthier?
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Our Verdict
When comparing peas to broad beans, we picked the peas.
Why?
Both are great of course, but…
Looking at the macros to start with, peas have more protein and more fiber. The differences aren’t huge, but they are clear.
In terms of vitamins, peas have more of vitamins A, B1, B2, B3, B5, B6, B9, E, K, and choline (some with very large margins, some with small), while broad beans contain a little more vitamin C (the margin is quite narrow though).
When it comes to minerals, peas have more calcium, copper, iron, magnesium, manganese, phosphorus, potassium, selenium, and zinc, while broad beans have more sodium. So this category wasn’t close.
Adding up the win from each of the categories makes for a clear triple-win for peas.
Easy-peasy!
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