Survival of the Prettiest – by Dr. Nancy Etcoff
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Beauty is in the eye of the beholder, right? And what does it matter, in this modern world, especially if we are already in a happy stable partnership?
The science of it, as it turns out, is less poetic. Not only is evolutionary psychology still the foundation of our perception of human beauty (yes, even if we have zero possibility of further procreation personally), but also, its effects are far, far wider than partner selection.
From how nice people are to you, to how much they trust you, to how easily they will forgive a (real or perceived) misdeed, to what kind of medical care you get (or don’t), your looks shape your experiences.
In this very easy-reading work that nevertheless contains very many references, Dr. Etcoff explores the science of beauty. Not just what traits are attractive and why, but also, what they will do for (or against) us—in concrete terms, with numbers.
Bottom line: if you’d like to better understand the subconscious biases held by yourself and others, this book is a top-tier primer.
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From eye exams to blood tests and surgery: how doctors use light to diagnose disease
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This is the next article in our ‘Light and health’ series, where we look at how light affects our physical and mental health in sometimes surprising ways. Read other articles in the series.
You’re not feeling well. You’ve had a pounding headache all week, dizzy spells and have vomited up your past few meals.
You visit your GP to get some answers and sit while they shine a light in your eyes, order a blood test and request some medical imaging.
Everything your GP just did relies on light. These are just some of the optical technologies that have had an enormous impact in how we diagnose disease.
megaflopp/Shutterstock 1. On-the-spot tests
Point-of-care diagnostics allow doctors to test patients on the spot and get answers in minutes, rather than sending samples to a lab for analysis.
The “flashlight” your GP uses to view the inside of your eye (known as an ophthalmoscope) is a great example. This allows doctors to detect abnormal blood flow in the eye, deformations of the cornea (the outermost clear layer of the eye), or swollen optical discs (a round section at the back of the eye where the nerve link to the brain begins). Swollen discs are a sign of elevated pressure inside your head (or in the worst case, a brain tumour) that could be causing your headaches.
The invention of lasers and LEDs has enabled many other miniaturised technologies to be provided at the bedside or clinic rather than in the lab.
Pulse oximetry is a famous example, where a clip attached to your finger reports how well your blood is oxygenated. It does this by measuring the different responses of oxygenated and de-oxygenated blood to different colours of light.
Pulse oximetry is used at hospitals (and sometimes at home) to monitor your respiratory and heart health. In hospitals, it is also a valuable tool for detecting heart defects in babies.
See that clip on the patient’s finger? That’s a pulse oximeter, which relies on light to monitor respiratory and heart health. CGN089/Shutterstock 2. Looking at molecules
Now, back to that blood test. Analysing a small amount of your blood can diagnose many different diseases.
A machine called an automated “full blood count analyser” tests for general markers of your health. This machine directs focused beams of light through blood samples held in small glass tubes. It counts the number of blood cells, determines their specific type, and reports the level of haemoglobin (the protein in red blood cells that distributes oxygen around your body). In minutes, this machine can provide a snapshot of your overall health.
For more specific disease markers, blood serum is separated from the heavier cells by spinning in a rotating instrument called a centrifuge. The serum is then exposed to special chemical stains and enzyme assays that change colour depending on whether specific molecules, which may be the sign of a disease, are present.
These colour changes can’t be detected with the naked eye. However, a light beam from an instrument called a spectrometer can detect tiny amounts of these substances in the blood and determine if the biomarkers for diseases are present, and at what levels.
Light shines through the blood sample and tells us whether biomarkers for disease are present. angellodeco/Shutterstock 3. Medical imaging
Let’s re-visit those medical images your GP ordered. The development of fibre-optic technology, made famous for transforming high-speed digital communications (such as the NBN), allows light to get inside the body. The result? High-resolution optical imaging.
A common example is an endoscope, where fibres with a tiny camera on the end are inserted into the body’s natural openings (such as your mouth or anus) to examine your gut or respiratory tracts.
Surgeons can insert the same technology through tiny cuts to view the inside of the body on a video screen during laparoscopic surgery (also known as keyhole surgery) to diagnose and treat disease.
Doctors can insert this flexible fibre-optic tube with a camera on the end into your body. Eduard Valentinov/Shutterstock How about the future?
Progress in nanotechnology and a better understanding of the interactions of light with our tissues are leading to new light-based tools to help diagnose disease. These include:
- nanomaterials (materials on an extremely small scale, many thousands of times smaller than the width of a human hair). These are being used in next-generation sensors and new diagnostic tests
- wearable optical biosensors the size of your fingernail can be included in devices such as watches, contact lenses or finger wraps. These devices allow non-invasive measurements of sweat, tears and saliva, in real time
- AI tools to analyse how blood serum scatters infrared light. This has allowed researchers to build a comprehensive database of scatter patterns to detect any cancer
- a type of non-invasive imaging called optical coherence tomography for more detailed imaging of the eye, heart and skin
- fibre optic technology to deliver a tiny microscope into the body on the tip of a needle.
So the next time you’re at the GP and they perform (or order) some tests, chances are that at least one of those tests depend on light to help diagnose disease.
Matthew Griffith, Associate Professor and ARC Future Fellow and Director, UniSA Microscopy and Microanalysis Facilities, University of South Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Is Fast Food Really All That Bad?
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Yes, yes it is. However, most people misunderstand the nature of its badness, which is what causes problems. The biggest problem is not the acute effects of one afternoon’s burger and fries; the biggest problem is the gradual slide into regularly eating junk food, and the long-term effects of that habit as our body changes to accommodate it (of which, people tend to focus on subcutaneous fat gain as it’s usually the most visible, but that’s really the least of our problems).
Cumulative effects
There are, of course, immediate negative effects too, and they’re not without cause for concern. Because of the composition of most junk food, it will almost by definition result in immediate blood sugar spikes, rising insulin levels, and a feeling of fatigue not long afterwards.
- Within a week of regularly consuming junk food, gut bacteria will change, resulting in moderate cravings, as well as a tendency towards depression and anxiety. Mood swings are likely, as are the gastrointestinal woes associated with any gut microbiota change.
- Within two weeks, those effects will be greater, the cravings will increase, energy levels will plummet, and likely skin issues may start to show up (our skin mostly works on a 3-week replacement cycle; some things can show up in the skin more quickly or slowly than that, though).
- Within three weeks, the rest of our blood metrics (e.g. beyond blood sugar imbalances) will start to stray from safe zones. Increased LDL, decreased HDL, and the beginnings of higher cardiovascular disease risk and diabetes risk.
- Within a month, we will likely see the onset of non-alcoholic fatty liver disease, and chronic inflammation sets in, raising the risk of a lot of other diseases, especially immune disorders and cancer.
If that seems drastic, along the lines of “eat junk food for a month and get cancer”, well, it’s an elevated risk, not a scheduled diagnosis, but the body is constantly rebuilding itself, for better or for worse, and if we sabotage its efforts by consuming a poor diet, then it will be for worse.
The good news is: this works both ways, and we can get our body back on track in fairly short order too, by enjoying a healthier diet; our body will be thrilled to start repairing itself. And of course, all these effects, good and bad, are proportional to how well or badly we eat. There’s a difference between doing a “Supersize Me” month-long 100% junk food diet, and “merely” getting a junk food breakfast each day and eating healthily later.
In short, if your diet is only moderately bad, then you will only be moderately unwell.
For more on all of this, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
- Fix Chronic Fatigue & Regain Your Energy, By Science
- How To Unfatty A Fatty Liver
- How to Prevent (or Reduce) Inflammation
Take care!
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Fix Chronic Fatigue & Regain Your Energy, By Science
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.
Chronic fatigue is on the rise. A lot of it appears to be Long COVID-related, but whether that’s the case for you or not, one thing that will make a big difference to your energy levels is something that French biochemist Jessie Inchauspé is here to explain:
Mitochondrial management
Inchauspé explains it in terms of a steam train; to keep running, it must have coal burning in its furnace. However, if more coal is delivered to the engine room faster than it can be put in the furnace and burned, and the coal just keeps on coming, the worker there will soon be overwhelmed trying to find places to put it all; the engine room will be full of coal, and the furnace will sputter and go out because the worker can’t even reach it on account of being buried in coal.
So it is with our glucose metabolism also. If we get spikes of glucose faster than our body can deal with them, it will overload the body’s ability to process that energy at all. Just like the steam train worker, our body will try! It’ll stuff that extra glucose wherever it can (storing as glycogen in the liver is a readily available option that’s easy to do and/but also gives you non-alcoholic fatty liver disease and isn’t quickly broken down into useable energy), and meanwhile, your actual mitochondria aren’t getting what they need (which is: a reliable, but gentle, influx of glucose).
You can imagine that the situation we described in the steam train isn’t good for the engine’s longevity, and the corresponding situation in the human body isn’t good for our mitochondria either (or our pancreas, or our liver, or… the list goes on). Indeed, damaged mitochondria affect exercise capacity and stress resilience—as well as being a long-term driver of cancer.
The remedy, of course, is blood sugar management. Specifically, avoiding glucose spikes. She has a list of 10 ways to do this (small changes to how we eat; what things to eat with what, in which order, etc) that make a huge measurable difference. For your convenience, we’ve linked those ten ways below; first though, if you’d like to hear it from Inchauspé directly (her style is very pleasant), enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
- 10 Ways To Balance Your Blood Sugars ← this is the longer list she’s referring to in the video!
- How To Unfatty A Fatty Liver ← also relevant
Take care!
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In Praise of Slowness – by Carl Honoré
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This isn’t just about “taking the time to smell the roses” although yes, that too. Rather, it’s mostly about looking at what drives us to speed everything up in the first place, and correcting where appropriate.
If your ancestors had time to eat fruit and lie in the sun, then why, with all of modern technology now available, are you harangued 16+ hours a day by the pressures of universally synchronized timepieces?
Honoré places a lot of the blame squarely on the industrial revolution; whereas previously our work would be limited by craftsmen who take a year to complete something, or the pace of animals in a field, now humans had to keep up with the very machines that were supposed to serve us—and it’s only got worse from there.
This book takes a tour of many areas affected by this artificial “need for speed”, and how it harms not just our work-life balance, but also our eating habits, the medical attention we get, and even our love lives.
The prescription is deceptively simple, “slow down”. But Honoré dedicates the final three chapters of the book to the “how” of this, when of course there’s a lot the outside world will not accommodate—but where we can slow down, there’s good to be gained.
Bottom line: if you’ve ever felt that you could get all of your life into order if you could just pause the outside world for a week or two, this is the book for you.
Click here to check out In Praise of Slowness, and make time for what matters most!
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5 dental TikTok trends you probably shouldn’t try at home
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TikTok is full of videos that demonstrate DIY hacks, from up-cycling tricks to cooking tips. Meanwhile, a growing number of TikTok videos offer tips to help you save money and time at the dentist. But do they deliver?
Here are five popular dental TikTok trends and why you might treat them with caution.
1. Home-made whitening solutions
Many TikTok videos provide tips to whiten teeth. These include tutorials on making your own whitening toothpaste using ingredients such as hydrogen peroxide, a common household bleaching agent, and baking soda (sodium bicarbonate).
In this video, the influencer says:
And then you’re going to pour in your hydrogen peroxide. There’s really no measurement to this.
But hydrogen peroxide in high doses is poisonous if swallowed, and can burn your gums, mouth and throat, and corrode your teeth.
High doses of hydrogen peroxide may infiltrate holes or microscopic cracks in your teeth to inflame or damage the nerves and blood vessels in the teeth, which can cause pain and even nerve death. This is why dental practitioners are bound by rules when we offer whitening treatments.
Sodium bicarbonate and hydrogen peroxide are among the components in commercially available whitening toothpastes. While these commercial products may be effective at removing surface stains, their compositions are carefully curated to keep your smile safe.
2. Oil pulling
Oil pulling involves swishing one tablespoon of sesame or coconut oil in your mouth for up to 20 minutes at a time. It has roots in Ayurvedic medicine, a traditional medicine practice that originates from the Indian subcontinent.
While oil pulling should be followed by brushing and flossing, I’ve had patients who believe oil pulling is a replacement for these practices.
There has been some research on the potential of oil pulling to treat gum disease or other diseases in the mouth. But overall, evidence that supports the effectiveness of oil pulling is of low certainty.
For example, studies that test the effectiveness of oil pulling have been conducted on school-aged children and people with no dental problems, and often measure dental plaque growth over a few days to a couple of weeks.
Chlorhexidine is an ingredient found in some commercially available mouthwashes.
In one study, people who rinsed with chlorhexidine mouthwash (30 seconds twice daily) developed less plaque on their teeth compared to those who undertook oil pulling for eight to 10 minutes.Ultimately, it’s unlikely you will experience measurable gain to your oral health by adding oil pulling to your daily routine. If you’re time-poor, you’re better off focusing on brushing your teeth and gums well alongside flossing.
3. Using rubber bands to fix gaps
This TikTok influencer shows his followers he closed the gaps between his front teeth in a week using cheap clear rubber bands.
But this person may be one of the lucky few to successfully use bands to close a gap in his teeth without any mishaps. Front teeth are slippery and taper near the gums into cone-shaped roots. This can cause bands to slide and disappear into the gums to surround the tooth roots, which can cause infections and pain.
If this happens, you may require surgery that involves cutting your gums to remove the bands. If the bands have caused an infection, you may lose the affected teeth. So it’s best to leave this sort of work to a dental professional trained in orthodontics.
4. Filing or cutting teeth to shape them
My teeth hurt just watching this video.
Cutting or filing teeth unnecessarily can expose the second, more sensitive tooth layer, called dentine, or potentially, the nerve and blood vessels inside the tooth. People undergoing this sort of procedure could experience anything from sensitive teeth through to a severe toothache that requires root canal treatment or tooth removal.
You may notice dentist drills spray water when cutting to protect your teeth from extreme heat damage. The drill in this video is dry with no water used to cool the heat produced during cutting.
It may also not be sterile. We like to have everything clean and sterile to prevent contaminated instruments used on one patient from potentially spreading an infection to another person.
Importantly, once you cut or file your teeth away, it’s gone forever. Unlike bone, hair or nails, our teeth don’t have the capacity to regrow.
5. DIY fillings
Many people on TikTok demonstrate filling cavities (holes) or replacing gaps between teeth with a material made from heated moulded plastic beads. DIY fillings can cause a lot of issues – I’ve seen this in my clinic first hand.
While we may make it look simple in dental surgeries, the science behind filling materials and how we make them stick to teeth to fill cavities is sophisticated.
Filling a cavity with the kind of material made from these beads will be as effective as using sticky tape on sand. Not to mention the cavity will continue to grow bigger underneath the untreated “filled” teeth.
I know it’s easy to say “see a dentist about that cavity” or “go to an orthodontist to fix that gap in your teeth you don’t like”, but it can be expensive to actually do these things. However if you end up requiring treatment to fix the issues caused at home, it may end up costing you much more.
So what’s the take-home message? Stick with the funny cat and dog videos on TikTok – they’re safer for your smile.
Arosha Weerakoon, Senior Lecturer and General Dentist, School of Dentistry, The University of Queensland
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Osteoporosis & Exercises: Which To Do (And Which To Avoid)
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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
❝Any idea about the latest research on the most effective exercises for osteoporosis?❞
While there isn’t much new of late in this regard, there is plenty of research!
First, what you might want to avoid:
- Sit-ups, and other exercises with a lot of repeated spinal flexion
- Running, and other high-impact exercises
- Skiing, horse-riding, and other activities with a high risk of falling
- Golf and tennis (both disproportionately likely to result in injuries to wrists, elbows, and knees)
Next, what you might want to bear in mind:
While in principle resistance training is good for building strong bones, good form becomes all the more important if you have osteoporosis, so consider working with a trainer if you’re not 100% certain you know what you’re doing:
Some of the best exercises for osteoporosis are isometric exercises:
5 Isometric Exercises for Osteoporosis (with textual explanations and illustrative GIFs)
You might also like this bone-strengthening exercise routine from corrective exercise specialist Kendra Fitzgerald:
Enjoy!
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