Mythbusting The Mask Debate
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Mythbusting The Mask Debate
We asked you for your mask policy this respiratory virus season, and got the above-depicted, below-described, set of responses:
- A little under half of you said you will be masking when practical in indoor public places
- A little over a fifth of you said you will mask only if you have respiratory virus symptoms
- A little under a fifth of you said that you will not mask, because you don’t think it helps
- A much smaller minority of you (7%) said you will go with whatever people around you are doing
- An equally small minority of you said that you will not mask, because you’re not concerned about infections
So, what does the science say?
Wearing a mask reduces the transmission of respiratory viruses: True or False?
True…with limitations. The limitations include:
- The type of mask
- A homemade polyester single-sheet is not the same as an N95 respirator, for instance
- How well it is fitted
- It needs to be a physical barrier, so a loose-fitting “going through the motions” fit won’t help
- The condition of the mask
- And if applicable, the replaceable filter in the mask
- What exactly it has to stop
- What kind of virus, what kind of viral load, what kind of environment, is someone coughing/sneezing, etc
More details on these things can be found in the link at the end of today’s main feature, as it’s more than we could fit here!
Note: We’re talking about respiratory viruses in general in this main feature, but most extant up-to-date research is on COVID, so that’s going to appear quite a lot. Remember though, even COVID is not one beast, but many different variants, each with their own properties.
Nevertheless, the scientific consensus is “it does help, but is not a magical amulet”:
- 2021: Effectiveness of Face Masks in Reducing the Spread of COVID-19: A Model-Based Analysis
- 2022: Why Masks are Important during COVID‐19 Pandemic
- 2023: The mitigating effect of masks on the spread of COVID-19
Wearing a mask is actually unhygienic: True or False?
False, assuming your mask is clean when you put it on.
This (the fear of breathing more of one’s own germs in a cyclic fashion) was a point raised by some of those who expressed mask-unfavorable views in response to our poll.
There have been studies testing this, and they mostly say the same thing, “if it’s clean when you put it on, great, if not, then well yes, that can be a problem”:
❝A longer mask usage significantly increased the fungal colony numbers but not the bacterial colony numbers.
Although most identified microbes were non-pathogenic in humans; Staphylococcus epidermidis, Staphylococcus aureus, and Cladosporium, we found several pathogenic microbes; Bacillus cereus, Staphylococcus saprophyticus, Aspergillus, and Microsporum.
We also found no associations of mask-attached microbes with the transportation methods or gargling.
We propose that immunocompromised people should avoid repeated use of masks to prevent microbial infection.❞
Source: Bacterial and fungal isolation from face masks under the COVID-19 pandemic
Wearing a mask can mean we don’t get enough oxygen: True or False?
False, for any masks made-for-purpose (i.e., are by default “breathable”), under normal conditions:
- COVID‐19 pandemic: do surgical masks impact respiratory nasal functions?
- Performance Comparison of Single and Double Masks: Filtration Efficiencies, Breathing Resistance and CO2 Content
However, wearing a mask while engaging in strenuous best-effort cardiovascular exercise, will reduce VO₂max. To be clear, you will still have more than enough oxygen to function; it’s not considered a health hazard. However, it will reduce peak athletic performance:
…so if you are worrying about whether the mask will impede you breathing, ask yourself: am I engaging in an activity that requires my peak athletic performance?
Also: don’t let it get soaked with water, because…
Writer’s anecdote as an additional caveat: in the earliest days of the COVID pandemic, I had a simple cloth mask on, the one-piece polyester kind that we later learned quite useless. The fit wasn’t perfect either, but one day I was caught in heavy rain (I had left it on while going from one store to another while shopping), and suddenly, it fitted perfectly, as being soaked through caused it to cling beautifully to my face.
However, I was now effectively being waterboarded. I will say, it was not pleasant, but also I did not die. I did buy a new mask in the next store, though.
tl;dr = an exception to “no it won’t impede your breathing” is that a mask may indeed impede your breathing if it is made of cloth and literally soaked with water; that is how waterboarding works!
Want up-to-date information?
Most of the studies we cited today were from 2022 or 2023, but you can get up-to-date information and guidance from the World Health Organization, who really do not have any agenda besides actual world health, here:
Coronavirus disease (COVID-19): Masks | Frequently Asked Questions
At the time of writing this newsletter, the above information was last updated yesterday.
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The Diet Compass – by Bas Kast
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Facts about nutrition and health can be hard to memorize. There’s just so much! And often there are so many studies, and while the science is not usually contradictory, pop-science headlines sure can be. What to believe?
Bas Kast brings us a very comprehensive and easily digestible solution.
A science journalist himself, he has gone through the studies so that you don’t have to, and—citing them along the way—draws out the salient points and conclusions.
But, he’s not just handing out directions (though he does that too); he’s arranged and formatted the information in a very readable and logical fashion. Chapter by chapter, we learn the foundations of important principles for “this is better than that” choices in diet.
Most importantly, he lays out for us his “12 simple rules for healthy eating“, and they are indeed as simple as they are well-grounded in good science.
Bottom line: if you want “one easy-reading book” to just tell you how to make decisions about your diet, simply follow those rules and enjoy the benefits… Then this book is exactly that.
Click here to check out The Diet Compass and get your diet on the right track!
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Thinking, Fast and Slow – by Dr. Daniel Kahneman
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We all try to make the best decisions we can with the information available… Don’t we?
Yet, somehow, a survival chance of 90% seems better than a mortality rate of 10%, and as it turns out, we as fallible humans are prey to all manner of dubious heuristics.
Nobel Prize winner Dr. Daniel Kahneman lays out for us two sytems of thought process:
- Fast, intuitive, emotional
- Slow, deliberate, logical
He makes the case for how and why we do need both, but often end up using the wrong one. He notes how the first is required for efficiency, or we would spend all day deciding what socks to wear… The second, meanwhile, is required for high-stakes decisions, but is lazy by nature, and often we don’t engage it when we ought to.
Over the course of many diverse examples, Dr. Kahneman shows how again and again, the second system is slowly cogitating at the back of the class, while the first system is bouncing up and down with its hand in the air saying “I know! I know!”, even when, in fact, it does not know.
For a book largely founded in economics (it’s a massive takedown of the notion of the rational consumer), it is not at all dry, and is very readable in style. It’s engaging throughout, and readers far removed from Wall Street will find plenty of ways it relates to our everyday lives.
Bottom line: if you’d like to avoid making many mistakes in what you’d assumed to be rational decisions, this book is critical reading.
Click here to check out “Thinking, Fast And Slow”, and enjoy the results of better decisions!
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Master Your Core – by Dr. Bohdanna Zazulak
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In the category of “washboard abs”, this one isn’t particularly interested in how much or how little fat you have. What it’s more interested in is a strong, resilient, and stable core. Including your abs yes, but also glutes, hips, and back.
Nor is the focus on superhuman feats of strength, though certainly one could use these exercises to work towards that. Rather, here we see importance placed on functional performance, mobility, and stability.
Lest mobility and stability seem at odds with each other, understand:
- By mobility we mean the range of movement we are able to accomplish.
- By stability, we mean that any movement we make is intentional, and not because we lost our balance.
Functional performance, meanwhile, is a function of those two things, plus strength.
How does the book deliver on this?
There are exercises to do. Exercises of the athletic kind you might expect, and also exercises including breathing exercises, which gets quite a bit of attention too. Not just “do abdominal breathing”, but quite an in-depth examination of such. There are also habits to form, and lifestyle tweaks to make.
Of course, you don’t have to do all the things she suggests. The more you do, the better results you are likely to get, but if you adopt even some of the practices she recommends, you’re likely to see some benefits. And, perhaps most importantly, reduce age-related loss of mobility, stability, and strength.
Bottom line: a great all-rounder book of core strength, mobility, and stability.
Click here to check out Master Your Core and enjoy the more robust health that comes with it!
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14 Powerful Strategies To Prevent Dementia
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Dementia risk starts climbing very steeply after the age of 65, but it’s not entirely predetermined. Dr. Brad Stanfield, a primary care physician, has insights:
The strategies
We’ll not keep them a mystery; they are:
- Cognitive stimulation: which means genuinely challenging mental activities using a variety of mental faculties. This will usually mean that anything that is just “same old, same old” all the time will stop giving benefits after a short while once it becomes rote, and you’ll need something harder and/or different.
- Hearing health: being unable to participate in conversations increases dementia risk; hearing aids can help.
- Eyesight health: similar to the above; regular eye tests are good, and the use of glasses where appropriate.
- Depression management: midlife depression is linked to later life dementia, likely in large part due to social isolation and a lack of stimulation, but either way, treating depression earlier reduces later dementia risk.
- Exercising regularly: what’s good for the heart is good for the brain; the brain is a hungry organ and the blood is what feeds it (and removes things that shouldn’t be there)
- Head injury avoidance: even mild head injuries can cause problems down the road. Protecting one’s head in sports, and even while casually cycling, is important.
- Smoking cessation: just don’t smoke; if you smoke, make it a top priority to quit unless you are given direct strong medical advice to the contrary (there are cases, few and far between, whereby quitting smoking genuinely needs to be deferred until after something else is dealt with first, but they are a lot rarer than a lot of people who are simply afraid of quitting would like to believe)
- Cholesterol management: again, healthy blood means a healthy brain, and that goes for triglycerides too.
- Weight management: obesity, especially waist to hip ratio (indicating visceral abdominal fat specifically) is associated with many woes, including dementia.
- Diabetes management: once again, healthy blood means a healthy brain, and that goes for blood sugar management too.
- Blood pressure management: guess what, healthy blood still means a healthy brain, and that goes for blood pressure too.
- Alcohol reduction/cessation: alcohol is bad for pretty much everything, and for most people who drink, quitting is probably the top thing to do after quitting smoking.
- Social engagement: while we all may have our different preferences on a scale of introversion to extroversion, we are fundamentally a social species and thrive best with social contact, even if it’s just a few people.
- Air pollution reduction: avoiding pollutants, and filtering the air we breathe where pollutants are otherwise unavoidable, makes a measurable difference to brain health outcomes.
For more information on all of these (except the last two, which really he only mentions in passing), enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
How To Reduce Your Alzheimer’s Risk ← our own main feature on the topic
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Winter Wellness – by Rachel de Thample
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Winter is often the season of comfort foods and, in much of the Western world, there’s a holiday season slide of forgotten diets and instead sugar, alcohol, pastry, and the like.
What de Thample does here is an antidote to all that, without sacrificing happiness and celebration.
Before the recipes get started, she has a chapter on “food as medicine“, and to our immense surprise, proceeds to detail, accurately, many categories such as
- Foods for immune health
- Foods against inflammation
- Foods for gut health
- Foods against aging
- Foods for energy levels
- Foods against anxiety
- Foods for hormonal balance
…and so forth, with lists of ingredients that fit into each category.
Then in the rest of the book, she lays out beautiful recipes for wonderful dishes (and drinks) that use those ingredients, without unhealthy additions.
The recipes are, by the way, what could best be categorized as “fancy”. However, they are fancy in the sense that they will be impressive for entertaining, and (again, to our great surprise) they don’t actually call for particularly expensive/rare ingredients, nor for arcane methods and special equipment.Instead, everything’s astonishingly accessible to put together and easy to execute.
Bottom line: if you’d like to indulge this winter, but would like to do so healthily, this is an excellent way to do so.
Click here to check out Winter Wellness, and level-up your seasonal health and happiness!
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Why You Probably Need More Sleep
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Sleep: yes, you really do still need it!
We asked you how much sleep you usually get, and got the above-pictured, below-described set of responses:
- A little of a third of all respondents selected the option “< 7 hours”
- However, because respondents also selected options such as < 6 hours, < 5 hours, and < 4 hours, so if we include those in the tally, the actual total percentage of respondents who reported getting under 7 hours, is actually more like 62%, or just under two thirds of all respondents.
- Nine respondents, which was about 5% of the total, reported usually getting under 4 hours sleep
- A little over quarter of respondents reported usually getting between 7 and 8 hours sleep
- Fifteen respondents, which was a little under 10% of the total, reported usually getting between 8 and 9 hours of sleep
- Three respondents, which was a little under 2% of the total, reported getting over 9 hours of sleep
- In terms of the classic “you should get 7–9 hours sleep”, approximately a third of respondents reported getting this amount.
You need to get 7–9 hours sleep: True or False?
True! Unless you have a (rare!) mutated ADRB1 gene, which reduces that.
The way to know whether you have this, without genomic testing to know for sure, is: do you regularly get under 6.5 hours sleep, and yet continue to go through life bright-eyed and bushy-tailed? If so, you probably have that gene. If you experience daytime fatigue, brain fog, and restlessness, you probably don’t.
About that mutated ADRB1 gene:
NIH | Gene identified in people who need little sleep
Quality of sleep matters as much as duration, and a lot of studies use the “RU-Sated” framework, which assesses six key dimensions of sleep that have been consistently associated with better health outcomes. These are:
- regularity / usual hours
- satisfaction with sleep
- alertness during waking hours
- timing of sleep
- efficiency of sleep
- duration of sleep
But, that doesn’t mean that you can skimp on the last one if the others are in order. In fact, getting a good 7 hours sleep can reduce your risk of getting a cold by three or four times (compared with six or fewer hours):
Behaviorally Assessed Sleep and Susceptibility to the Common Cold
^This study was about the common cold, but you may be aware there are more serious respiratory viruses freely available, and you don’t want those, either.
Napping is good for the health: True or False?
True or False, depending on how you’re doing it!
If you’re trying to do it to sleep less in total (per polyphasic sleep scheduling), then no, this will not work in any sustainable fashion and will be ruinous to the health. We did a Mythbusting Friday special on specifically this, a while back:
Could Just Two Hours Sleep Per Day Be Enough?
PS: you might remember Betteridge’s Law of Headlines
If you’re doing it as a energy-boosting supplement to a reasonable night’s sleep, napping can indeed be beneficial to the health, and can give benefits such as:
- Increased alertness
- Helps with learning
- Improved memory
- Boost to immunity
- Enhance athletic performance
However! There is still a right and a wrong way to go about it, and we wrote about this previously, for a Saturday Life Hacks edition of 10almonds:
How To Nap Like A Pro (No More “Sleep Hangovers”!)
As we get older, we need less sleep: True or False
False, with one small caveat.
The small caveat: children and adolescents need 9–12 hours sleep because, uncredited as it goes, they are doing some seriously impressive bodybuilding, and that is exhausting to the body. So, an adult (with a normal lifestyle, who is not a bodybuilder) will tend to need less sleep than a child/adolescent.
But, the statement “As we get older, we need less sleep” is generally taken to mean “People in the 65+ age bracket need less sleep than younger adults”, and this popular myth is based on anecdotal observational evidence: older people tend to sleep less (as our survey above shows! For any who aren’t aware, our readership is heavily weighted towards the 60+ demographic), and still continue functioning, after all.
Just because we survive something with a degree of resilience doesn’t mean it’s good for us.
In fact, there can be serious health risks from not getting enough sleep in later years, for example:
Sleep deficiency promotes Alzheimer’s disease development and progression
Want to get better sleep?
What gets measured, gets done. Sleep tracking apps can be a really good tool for getting one’s sleep on a healthier track. We compared and contrasted some popular ones:
The Head-To-Head Of Google and Apple’s Top Apps For Getting Your Head Down
Take good care of yourself!
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