A Cold Shower A Day Keeps The Doctor Away?
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A Cold Shower A Day Keeps The Doctor Away?
This is Dutch extreme athlete Wim Hof, also known as “The Iceman”! He’s broken many world records mostly relating to the enduring the cold, for example:
- climbing Mount Kilimanjaro in shorts
- running a half-marathon above the Arctic Circle barefoot
- standing in a container completely covered with ice cubes for more than 112 minutes
You might not want to do yoga in your pyjamas on an iceberg, but you might like…
- better circulatory health
- reduced risk of stroke
- a boosted immune system
- healthier skin
- more energy and alertness
…and things like that. Wim Hof’s method is not just about extreme athletic achievements; most of what he does, the stuff that can benefit the rest of us, is much more prosaic.
The Wim Hof Method
For Wim Hof, three things are key:
- Breathing (See: Wim Hof Method Breathing Exercises)
- Commitment (See: How to Increase Willpower)
- Cold therapy (See: Benefits of Cold Therapy)
Today, we’re going to be focusing on the last one there.
What are the benefits of Cold Therapy?
Once upon a time, we didn’t have central heating, electric blankets, thermal underwear, and hot showers. In fact, once upon a time, we didn’t have houses or clothes. We used to be a lot more used to the elements! And while it’s all well and good to enjoy modern comforts, it has left our bodies lacking practice.
Practice at what? Most notably: vasodilation and vasoconstriction, in response to temperature changes. Either:
- vasodilation, because part of our body needs more blood to keep it warm and nourished, or
- vasoconstriction, because part of our body needs less blood running through it to get cooled down.
Switching between the two gives the blood vessels practice at doing it, and improves vascular muscle tone. If your body doesn’t get that practice, your blood vessels will be sluggish at making the change. This can cause circulation problems, which in turn have a big impact in many other areas of health, including:
- cardiovascular disease
- stroke risk
- mood instability
- nerve damage in extremities
On the flipside, if the blood vessels do get regular practice at dilating and constricting, you might enjoy lower risk of those things, and instead:
- improved immune response
- healthier skin
- better quality sleep
- more energy and alertness
- improved sexual performance/responsiveness
So, how to get that, without getting extreme?
As today’s title suggests, “a cold shower a day” is a great practice.
You don’t have to jump straight in, especially if you think your circulation and vascular responses might be a bit sluggish in the first instance. In fact, Wim Hof recommends:
- Week 1: Thirty seconds of cold water at the end of a warm shower each morning
- Week 2: One minute of cold water at the end of a warm shower each morning
- Week 3: A minute and a half of cold water at the end of a warm shower each morning
- Week 4: Two minutes of cold water at the end of a warm shower each morning
How cold is cold?
The benefits of cold exposure begin at around 16ºC / 60ºF, so in most places, water from the cold water mains is sufficiently cold.
As your body becomes more used to making the quick-change on a vascular level, the cold water will seem less shocking to your system. In other words, on day 30 it won’t hit you like it did on day one.
At that point, you can either continue with your two-minutes daily cold shower, and reap the benefits, or if you’re curious to push it further, that’s where ice baths come in!
Can anyone do it, or are any conditions contraindicated?
As ever, we’re a health and productivity newsletter, not doctors, let alone your doctors. Nothing here is medical advice. However, Wim Hof himself says:
❝Listen to your body, and never force the practices. We advise against doing Wim Hof Method if you are dealing with any of the following:
- Epilepsy
- High blood pressure
- Coronary heart disease
- A history of serious healthy issues like heart failure or stroke
- Pregnancy*
- Childhood*❞
*There is simply not enough science regarding the effects of cold exposure on people who are pregnant, or children. Obviously, we don’t expect this to be remedied anytime soon, because the study insitutions’ ethics boards would (rightly!) hold up the study.
As for the other conditions, and just generally if unsure, consult a doctor.
As you can see, this does mean that a limitation of Cold Therapy is that it appears to be far better as a preventative, since it helps guard against the very conditions that could otherwise become contraindications.
We haven’t peppered today’s main feature with study papers, partly because Wim Hof’s own website has kindly collated a collection of them (with links and summaries!) onto one page:
Further reading: The Science Behind The Wim Hof Method
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Bird flu has been detected in a pig in the US. Why does that matter?
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The United States Department of Agriculture last week reported that a pig on a backyard farm in Oregon was infected with bird flu.
As the bird flu situation has evolved, we’ve heard about the A/H5N1 strain of the virus infecting a range of animals, including a variety of birds, wild animals and dairy cattle.
Fortunately, we haven’t seen any sustained spread between humans at this stage. But the detection of the virus in a pig marks a worrying development in the trajectory of this virus.
David MG/Shutterstock How did we get here?
The most concerning type of bird flu currently circulating is clade 2.3.4.4b of A/H5N1, a strain of influenza A.
Since 2020, A/H5N1 2.3.4.4b has spread to a vast range of birds, wild animals and farm animals that have never been infected with bird flu before.
While Europe is a hotspot for A/H5N1, attention is currently focused on the US. Dairy cattle were infected for the first time in 2024, with more than 400 herds affected across at least 14 US states.
Bird flu has enormous impacts on farming and commercial food production, because infected poultry flocks have to be culled, and infected cows can result in contaminated diary products. That said, pasteurisation should make milk safe to drink.
While farmers have suffered major losses due to H5N1 bird flu, it also has the potential to mutate to cause a human pandemic.
Birds and humans have different types of receptors in their respiratory tract that flu viruses attach to, like a lock (receptors) and key (virus). The attachment of the virus allows it to invade a cell and the body and cause illness. Avian flu viruses are adapted to birds, and spread easily among birds, but not in humans.
So far, human cases have mainly occurred in people who have been in close contact with infected farm animals or birds. In the US, most have been farm workers.
The concern is that the virus will mutate and adapt to humans. One of the key steps for this to happen would be a shift in the virus’ affinity from the bird receptors to those found in the human respiratory tract. In other words, if the virus’ “key” mutated to better fit with the human “lock”.
A recent study of a sample of A/H5N1 2.3.4.4b from an infected human had worrying findings, identifying mutations in the virus with the potential to increase transmission between human hosts.
Why are pigs a problem?
A human pandemic strain of influenza can arise in several ways. One involves close contact between humans and animals infected with their own specific flu viruses, creating opportunities for genetic mixing between avian and human viruses.
Pigs are the ideal genetic mixing vessel to generate a human pandemic influenza strain, because they have receptors in their respiratory tracts which both avian and human flu viruses can bind to.
This means pigs can be infected with a bird flu virus and a human flu virus at the same time. These viruses can exchange genetic material to mutate and become easily transmissible in humans.
The Conversation, CC BY-SA Interestingly, in the past pigs were less susceptible to A/H5N1 viruses. However, the virus has recently mutated to infect pigs more readily.
In the recent case in Oregon, A/H5N1 was detected in a pig on a non-commercial farm after an outbreak occurred among the poultry housed on the same farm. This strain of A/H5N1 was from wild birds, not the one that is widespread in US dairy cows.
The infection of a pig is a warning. If the virus enters commercial piggeries, it would create a far greater level of risk of a pandemic, especially as the US goes into winter, when human seasonal flu starts to rise.
How can we mitigate the risk?
Surveillance is key to early detection of a possible pandemic. This includes comprehensive testing and reporting of infections in birds and animals, alongside financial compensation and support measures for farmers to encourage timely reporting.
Strengthening global influenza surveillance is crucial, as unusual spikes in pneumonia and severe respiratory illnesses could signal a human pandemic. Our EPIWATCH system looks for early warnings of such activity, which can speed up vaccine development.
If a cluster of human cases occurs, and influenza A is detected, further testing (called subtyping) is essential to ascertain whether it’s a seasonal strain, an avian strain from a spillover event, or a novel pandemic strain.
Early identification can prevent a pandemic. Any delay in identifying an emerging pandemic strain enables the virus to spread widely across international borders.
Australia’s first human case of A/H5N1 occurred in a child who acquired the infection while travelling in India, and was hospitalised with illness in March 2024. At the time, testing revealed Influenza A (which could be seasonal flu or avian flu), but subtyping to identify A/H5N1 was delayed.
This kind of delay can be costly if a human-transmissible A/H5N1 arises and is assumed to be seasonal flu because the test is positive for influenza A. Only about 5% of tests positive for influenza A are subtyped further in Australia and most countries.
In light of the current situation, there should be a low threshold for subtyping influenza A strains in humans. Rapid tests which can distinguish between seasonal and H5 influenza A are emerging, and should form part of governments’ pandemic preparedness.
A higher risk than ever before
The US Centers for Disease Control and Prevention states that the current risk posed by H5N1 to the general public remains low.
But with H5N1 now able to infect pigs, and showing worrying mutations for human adaptation, the level of risk has increased. Given the virus is so widespread in animals and birds, the statistical probability of a pandemic arising is higher than ever before.
The good news is, we are better prepared for an influenza pandemic than other pandemics, because vaccines can be made in the same way as seasonal flu vaccines. As soon as the genome of a pandemic influenza virus is known, the vaccines can be updated to match it.
Partially matched vaccines are already available, and some countries such as Finland are vaccinating high-risk farm workers.
C Raina MacIntyre, Professor of Global Biosecurity, NHMRC L3 Research Fellow, Head, Biosecurity Program, Kirby Institute, UNSW Sydney and Haley Stone, Research Associate, Biosecurity Program, Kirby Institute & CRUISE lab, Computer Science and Engineering, UNSW Sydney
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Holy Basil: What Does (And Doesn’t) It Do?
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First, a quick clarification:
- Ocimum sanctum is the botanical name given to what in English we call holy basil, and is what we will be discussing today. It’s also called “tulsi“, so if you see that name around, it is the same plant.
- Ocimum basilicum is the botanical name given to culinary basil, the kind you will find in your local supermarket. This one looks similar, but it has a different taste (culinary basil is sweeter) and a different phytochemical profile, and is certainly not the same plant.
We have touched on holy basil before, in our article:
Herbs For Evidence-Based Health & Healing
…where we listed that it helps boost immunity, per:
It’s popularly also consumed in the hopes of getting many other benefits, including:
- Calming effects on the mood (anti-stress)
- Accelerated wound-healing
- Anticancer activity
So, does it actually do those things?
Against stress
We literally couldn’t find anything. It’s often listed as being adaptogenic (reduces stress) in the preamble part of a given paper’s abstract, but we could find no study in any reputable journal that actually tested its effects against stress, and any citations for the claim just link to other papers that also include it in the preamble—and while “no original research” is a fine policy for, say, Wikipedia, it’s not a great policy when it comes to actual research science.
So… It might! There’s also no research (that we could find) showing that it doesn’t work. But one cannot claim something works on the basis of “we haven’t proved it doesn’t”.
For wound healing
Possibly! We found one (1) paper with a small (n=29) sample, and the results were promising, but that sample size of 29 was divided between three groups: a placebo control, holy basil, and another herb (which latter worked less well). So the resultant groups were tiny, arguably to the point of statistical insignificance. However, taking the study at face value and ignoring the small sample size, the results were very promising, as the holy basil group enjoyed a recovery in 4 weeks, rather than the 5 weeks recovery time of the control group:
Herbal remedies for mandibular fracture healing
An extra limitation that’s worth noting, though, is that healing bone is not necessarily the same as healing other injuries in all ways, so the same results might not be replicated in, say, organ or tissue injuries.
Against cancer
This time, there’s lots of evidence! Its mechanism of action appears to be severalfold:
- Anti-inflammatory
- Antioxidant
- Antitumor
- Chemopreventive
Because of the abundance of evidence (including specifically against skin cancer, lung cancer, breast cancer, and more), we could list studies all day here, but instead we’ll just link this one really good research review that has a handy navigation menu on the right, where you can see how it works in each of the stated ways.
Here’s the paper:
An Update on the Therapeutic Anticancer Potential of Ocimum sanctum L.: “Elixir of Life”
Want to try some?
We don’t sell it, but here for your convenience is an example product on Amazon 😎
Enjoy!
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Mediterranean Diet Book Suggestions
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It’s Q&A Day at 10almonds!
Have a question or a request? You can always hit “reply” to any of our emails, or use the feedback widget at the bottom!
In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!
As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!
So, no question/request too big or small
❝What is Mediterranean diet which book to read?❞
We did a special edition about the Mediterranean Diet! So that’s a great starting point.
As to books, there are so many, and we review books about it from time to time, so keep an eye out for our daily “One-Minute Book Review” section. We do highly recommend “How Not To Die”, which is a science-heavy approach to diet-based longevity, and essentially describes the Mediterranean Diet, with some tweaks.
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Black Beans vs Soy Beans – Which is Healthier?
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Our Verdict
When comparing black beans to soy beans, we picked the soy.
Why?
Quite some heavyweights competing here today, as both have been the winners of other comparisons!
Comparing these two’s macros first, black beans have 3x the carbs and slightly more fiber, while soy has more than 2x the protein. We’ll call this a win for soy.
As a tangential note, it’s worth remembering also that soy is a complete protein (contains a full set of the amino acids we need), whereas black beans… Well, technically they are too, but in practicality, they only have much smaller amounts of some amino acids.
In terms of vitamins, black beans have more of vitamins B1, B3, B5, B9, and E, while soy beans have more of vitamins A, B2, B6, C, K, and choline. A marginal win for soy here.
In the category of minerals, however, it isn’t close: black beans are not higher in any minerals, while soy beans are higher in calcium, copper, iron, magnesium, manganese, phosphorus, potassium, selenium, and zinc. An overwhelming win for soy.
It should be noted, however, that black beans are still very good for minerals! They just look bad when standing next to soy, that’s all.
So, enjoy either or both, but for nutritional density, soy wins the day.
Want to learn more?
You might like to read:
Plant vs Animal Protein: Head to Head
Take care!
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Make Your Saliva Better For Your Teeth
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A new study has highlighted the importance of lifestyle factors in shaping the oral microbiome—that is to say, how the things we do affect the bacteria that live in our mouths:
Nepali oral microbiomes reflect a gradient of lifestyles from traditional to industrialized
Neither the study title nor the abstract elucidate how, exactly, one impacts the other, but the study itself does (of course) contain that information; we read it, and the short version is:
In terms of the extremes of “most traditional” to “most industrialized”, foragers have the most diverse oral microbiomes (that’s good), and people with an American industrialized lifestyle had the least diverse oral microbiomes (that’s bad). Between the two extremes, we see the gradient promised by the title.
If you do feel like checking it out, Figure 3 in the paper illustrates this nicely.
Also illustrated in the above-linked Figure 3 is oral microbiome composition. In other words (and to oversimplify it rather), how good or bad our mouth bacteria are for us, independent of diversity (so for example, are there more of this or that kind of bacteria).
Once again, there is a gradient, only this time, the ends of it are even more polarized: foragers have a diverse oral microbiome rich with healthy-for-humans bacteria, while people with an American industrialized lifestyle might not have the diversity, but do have a large number of bad-for-humans bacteria.
While many lifestyle factors are dietary or quasi-dietary, e.g. what kinds of foods people eat, whether they drink alcohol, whether they smoke or use gum, etc, many lifestyle factors were examined, including everything from medications and exercise, to things like kitchen location and what fuel is predominantly used, to education and sexual activity and many other things that we don’t have room for here.
You can see how each lifestyle factor stacked up, in Figure 5.
Why it matters
Our oral microbiome affects many aspects of health, including:
- Locally: caries, periodontal diseases, mucosal diseases, oral cancer, and more
- Systemically: gastrointestinal diseases in general, IBS in particular, nervous system diseases, Alzheimer’s disease, endocrine diseases, all manner of immune/autoimmune diseases, and more
Nor are the effects it has mild; oral microbiome health can be a huge factor, statistically, for many of the above. You can see information and data pertaining to all of the above and more, here:
Oral microbiomes: more and more importance in oral cavity and whole body
What to do about it
Take care of your oral microbiome, to help it to take care of you. As well as the above-mentioned lifestyle factors, it’s worth noting that when it comes to oral hygiene, not all oral hygiene products are created equal:
Toothpastes & Mouthwashes: Which Kinds Help, And Which Kinds Harm?
Additionally, you might want to consider gentler options, but if you do, take care to opt for things that science actually backs., rather than things that merely trended on social media.
This writer (hi, it’s me) is particularly excited about the science and use of the miswak stick, which comes from the Saladora persica tree, and has phytochemical properties that (amongst many other health-giving effects) improve the quality of saliva (i.e., improve its pH and microbiome composition). In essence, your own saliva gets biochemically nudged into being the safest, most effective mouthwash.
There’s a lot of science for the use of S. persica, and we’ve discussed it before in more detail than we have room to rehash today, here:
Less Common Oral Hygiene Options
If you’d like to enjoy these benefits (and also have the equivalent of a toothbrush that you can carry with you at all times and does not require water*), then here’s an example product on Amazon 😎
*don’t worry, it won’t feel like dry-brushing your teeth. Remember what we said about what it does to your saliva. Basically, you chomp it once, and your saliva a) increases and b) becomes biological tooth-cleaning fluid. The stick itself is fibrous, so the end of it frays in a way that makes a natural little brush. Each stick is about 5”×¼” and you can carry it in a little carrying case (you’ll get a couple with each pack of miswak sticks), so you can easily use it in, say, the restroom of a restaurant or before your appointment somewhere, just as easily as you could use a toothpick, but with much better results. You may be wondering how long a stick lasts; well, that depends on how much you use it, but in this writer’s experience, each stick lasts about a month maybe, using it at least 2–3 times per day, probably rather more since I use it after each meal/snack and upon awakening.
(the above may read like an ad, but we promise you it’s not sponsored and this writer’s just enthusiastic, and when you read the science, you will be too)
Enjoy!
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Invigorating Sabzi Khordan
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Have you ever looked at the nutritional values and phytochemical properties of herbs, and thought “well that’s all well and good, but we only use a tiny amount”? Sabzi khordan is a herb-centric traditional Levantine sharing platter served most commonly as an appetizer, and it is indeed appetizing! Never again will “start your meal with a green salad to ensure a gentle blood sugar curve” seem like a chore:
You will need
- Large bunch of parsley
- Small bunch of tarragon leaves
- Small bunch of basil leaves
- Small bunch of mint
- Small bunch of sorrel leaves
- 7 oz block of feta cheese (if vegan, a plant-based substitution is fine in culinary terms, but won’t have the same gut-healthy benefits, as plant-based cheeses are not fermented)
- 9 oz labneh-stuffed vine leaves in olive oil (if vegan, same deal as the above, except it’s harder to find plant-based substitutes for labneh (strained yogurt cheese), so you might want to use our Plant-Based Healthy Cream Cheese recipe instead and make your own)
- 2 tbsp za’atar (you can make your own by blending dried hyssop, dried sumac berries, sesame seeds, dried thyme, and salt—but if you haven’t had za’atar before, we recommend first buying some like the one that we linked, so that next time you know what you’re aiming for)
- 3 tbsp extra virgin olive oil
- 10 radishes
- 6 scallions
- 9 oz walnuts, soaked in water overnight and drained
- 1 cucumber, cut into batons
- Warm flatbreads (you can use our Healthy Homemade Flatbreads recipe)
Method
(we suggest you read everything at least once before doing anything)
1) Arrange the feta, labneh, za’atar, and olive oil in separate little serving dishes.
2) Arrange everything else around them on a platter.
3) Serve! You may be thinking: did we really need a recipe to tell us “put the things on a plate”? The answer here is that this one today was shared mostly as a matter of inspiration, because when was the last time you thought to serve herbs as the star of the dish? Plus, it’s an excuse to try za’atar, not something so commonly seen outside of the Levant.
An alternative presentation
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Herbs for Evidence-Based Health & Healing
- Making Friends With Your Gut (You Can Thank Us Later)
- 10 Ways To Balance Blood Sugars
Take care!
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