Shedding Some Obesity Myths
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Let’s shed some obesity myths!
There are a lot of myths and misconceptions surrounding obesity… And then there are also reactive opposite myths and misconceptions, which can sometimes be just as harmful!
To tackle them all would take a book, but in classic 10almonds style, we’re going to put a spotlight on some of the ones that might make the biggest difference:
True or False: Obesity is genetically pre-determined
False… With caveats.
Some interesting results have been found from twin studies and adoption studies, showing that genes definitely play some role, but lifestyle is—for most people—the biggest factor:
- The body-mass index of twins who have been reared apart
- An adoption study of human obesity
- Using a sibling-adoption design to parse genetic and environmental influences on children’s body mass index
In short: genes predispose; they don’t predetermine. But that predisposition alone can make quite a big difference, if it in turn leads to different lifestyle factors.
But upon seeing those papers centering BMI, let’s consider…
True or False: BMI is a good, accurate measure of health in the context of bodyweight
False… Unless you’re a very large group of thin white men of moderate height, which was the demographic the system was built around.
Bonus information: it was never intended to be used to measure the weight-related health of any individual (not even an individual thin white man of moderate height), but rather, as a tool to look at large-scale demographic trends.
Basically, as a system, it’s being used in a way it was never made for, and the results of that misappropriation of an epidemiological tool for individual health are predictably unhelpful.
To do a deep-dive into all the flaws of the BMI system, which are many, we’d need to devote a whole main feature just to that. (Reply to this email if you’d be interested in seeing that!). But for now, we’ll just drop some further reading for anyone interested:
BMI Flaws, History, And Other Ways To Measure Body Weight And Fat
True or False: Obesity does not meaningfully impact more general health
False… In more ways than one (but there are caveats)
Obesity is highly correlated with increased risk of all-cause mortality, and weight loss, correspondingly, correlates with a reduced risk. See for example:
So what are the caveats?
Let’s put it this way: owning a horse is highly correlated with increased healthy longevity. And while owning a horse may come with some exercise and relaxation (both of which are good for the health), it’s probably mostly not the horse itself that conveys the health benefits… it’s that someone who has the resources to look after a horse, probably has the resources to look after their own health too.
So sometimes there can be a reason for a correlation (it’s not a coincidence!) but the causative factor is partially (or in some cases, entirely) something else.
So how could this play out with obesity?
There’s a lot of discrimination in healthcare settings, unfortunately! In this case, it often happens that a thin person goes in with a medical problem and gets treated for that, while a fat person can go in with the same medical problem and be told “you should try losing some weight”.
Top tip if this happens to you… Ask: “what would you advise/prescribe to a thin person with my same symptoms?”
Other things may be more systemic, for example:
When a thin person goes to get their blood pressure taken, and that goes smoothly, while a fat person goes to get their blood pressure taken, and there’s not a blood pressure cuff to fit them, is the problem the size of the person or the size of the cuff? It all depends on perspective, in a world built around thin people.
That’s a trivial-seeming example, but the same principle has far-reaching (and harmful) implications in healthcare in general, e.g:
- Surgeons being untrained (and/or unwilling) to operate on fat people
- Getting a one-size-fits-all dose that was calculated using average weight, and now doesn’t work
- MRI machines are famously claustrophobia-inducing for thin people; now try not fitting in it in the first place
…and so forth. So oftentimes, obesity will be correlated with a poor healthcare outcome, where the problem is not actually the obesity itself, but rather the system having been set up with thin people in mind.
It would be like saying “Having O- blood type results in higher risks when receiving blood transfusions”, while omitting to add “…because we didn’t stock O- blood”.
True or False: to reduce obesity, just eat less and move more!
False… Mostly.
Moving more is almost always good for most people. When it comes to diet, quality is much more important than quantity. But these factors alone are only part of the picture!
But beyond diet and exercise, there are many other implicated factors in weight gain, weight maintenance, and weight loss, including but not limited to:
- Disrupted sleep
- Chronic stress
- Chronic pain
- Hormonal imbalances
- Physical disabilities that preclude a lot of exercise
- Mental health issues that add (and compound) extra levels of challenge
- Medications that throw all kinds of spanners into the works with their side effects
…and even just those first two things, diet and exercise, are not always so correlated to weight as one might think—studies have found that the difference for exercise especially is often marginal:
Read: Widespread misconceptions about obesity ← academic article in the Journal of the College of Family Physicians of Canada
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Supergreen Superfood Salad Slaw
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When it comes to “eating the rainbow”, in principle green should be the easiest color to get in, unless we live in a serious food desert (or serious food poverty). In practice, however, a lot of meals could do with a dash more green. This “supergreen superfood salad slaw” is remarkably versatile, and can be enjoyed as a very worthy accompaniment to almost any main.
You will need
For the bits:
- ½ small green cabbage, finely diced
- 7 oz tenderstem broccoli, finely chopped
- 2 stalks celery, finely chopped (if allergic, simply omit)
- ½ cucumber, diced into small cubes
- 2 oz kale, finely shredded
- 4 green (spring) onions, thinly sliced
For the dressing:
- 1 cup cashews (if allergic, substitute 1 cup roasted chickpeas)
- ½ cup extra virgin olive oil
- 2 oz baby spinach
- 1 oz basil leaves
- 1 oz chives
- ¼ bulb garlic
- 2 tbsp nutritional yeast
- 1 tbsp chia seeds
- Juice of two limes
Method
(we suggest you read everything at least once before doing anything)
1) Combine the ingredients from the “bits” category in a bowl large enough to accommodate them comfortably
2) Blend the ingredients from the “dressing” category in a blender until very smooth (the crux here is you do not want any stringy bits of spinach remaining)
3) Pour the dressing onto the bits, and mix well to combine. Refrigerate, ideally covered, until ready to serve.
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Level-Up Your Fiber Intake! (Without Difficulty Or Discomfort)
- Spinach vs Kale – Which is Healthier?
- Brain Food? The Eyes Have It!
Take care!
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Salt Sugar Fat – by Michael Moss
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You are probably already aware that food giants put unhealthy ingredients in processed food. So what does this book offer of value?
Sometimes, better understanding leads to better movation. In this case, while a common (reasonable) view has been:
“The food giants fill their food with salt, sugar, and fat, because it makes that food irresistibly delicious”
…but that doesn’t exactly put us off the food, does it? It just makes it a guilty pleasure. Ah yes, the irresistible McDouble Dopamineburger. The time-honored tradition of Pizza Night; a happy glow; a special treat.
What Pulitzer-winning author Michael Moss brings to us is different.
He examines not just how they hooked us, but why. And the answer is not merely the obvious “profit and greed”, but also “survival, under capitalism”. That without regulation forcing companies to keep salt/sugar/fat levels down, companies that have tried to do so voluntarily have quickly had to u-turn to regain any hope of competitiveness.
He also looks at how the salt/sugar/fat components are needed to mask the foul taste of the substandard ingredients they use to maintain lower costs… Processed food, without the heavy doses of salt/sugar/fat, is not anywhere close to what you might make at home. Industry will cut costs where it can.
Bottom line: if you need a push to kick the processed food habit, this is the book that will do it.
Click here to check out Salt Sugar Fat, and reclaim your health!
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Are you over 75? Here’s what you need to know about vitamin D
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Vitamin D is essential for bone health, immune function and overall wellbeing. And it becomes even more crucial as we age.
New guidelines from the international Endocrine Society recommend people aged 75 and over should consider taking vitamin D supplements.
But why is vitamin D so important for older adults? And how much should they take?
OPPO Find X5 Pro/Unsplash Young people get most vitamin D from the sun
In Australia, it is possible for most people under 75 to get enough vitamin D from the sun throughout the year. For those who live in the top half of Australia – and for all of us during summer – we only need to have skin exposed to the sun for a few minutes on most days.
The body can only produce a certain amount of vitamin D at a time. So staying in the sun any longer than needed is not going to help increase your vitamin D levels, while it will increase your risk of skin cancer.
But it’s difficult for people aged over 75 to get enough vitamin D from a few minutes of sunshine, so the Endocrine Society recommends people get 800 IU (international units) of vitamin D a day from food or supplements.
Why you need more as you age
This is higher than the recommendation for younger adults, reflecting the increased needs and reduced ability of older bodies to produce and absorb vitamin D.
Overall, older adults also tend to have less exposure to sunlight, which is the primary source of natural vitamin D production. Older adults may spend more time indoors and wear more clothing when outdoors.
As we age, our skin also becomes less efficient at synthesising vitamin D from sunlight.
The kidneys and the liver, which help convert vitamin D into its active form, also lose some of their efficiency with age. This makes it harder for the body to maintain adequate levels of the vitamin.
All of this combined means older adults need more vitamin D.
Deficiency is common in older adults
Despite their higher needs for vitamin D, people over 75 may not get enough of it.
Studies have shown one in five older adults in Australia have vitamin D deficiency.
In higher-latitude parts of the world, such as the United Kingdom, almost half don’t reach sufficient levels.
This increased risk of deficiency is partly due to lifestyle factors, such as spending less time outdoors and insufficient dietary intakes of vitamin D.
It’s difficult to get enough vitamin D from food alone. Oily fish, eggs and some mushrooms are good sources of vitamin D, but few other foods contain much of the vitamin. While foods can be fortified with the vitamin D (margarine, some milk and cereals), these may not be readily available or be consumed in sufficient amounts to make a difference.
In some countries such as the United States, most of the dietary vitamin D comes from fortified products. However, in Australia, dietary intakes of vitamin D are typically very low because only a few foods are fortified with it.
Why vitamin D is so important as we age
Vitamin D helps the body absorb calcium, which is essential for maintaining bone density and strength. As we age, our bones become more fragile, increasing the risk of fractures and conditions like osteoporosis.
Keeping bones healthy is crucial. Studies have shown older people hospitalised with hip fractures are 3.5 times more likely to die in the next 12 months compared to people who aren’t injured.
People over 75 often have less exposure to sunlight. Aila Images/Shutterstock Vitamin D may also help lower the risk of respiratory infections, which can be more serious in this age group.
There is also emerging evidence for other potential benefits, including better brain health. However, this requires more research.
According to the society’s systematic review, which summarises evidence from randomised controlled trials of vitamin D supplementation in humans, there is moderate evidence to suggest vitamin D supplementation can lower the risk of premature death.
The society estimates supplements can prevent six deaths per 1,000 people. When considering the uncertainty in the available evidence, the actual number could range from as many as 11 fewer deaths to no benefit at all.
Should we get our vitamin D levels tested?
The Endocrine Society’s guidelines suggest routine blood tests to measure vitamin D levels are not necessary for most healthy people over 75.
There is no clear evidence that regular testing provides significant benefits, unless the person has a specific medical condition that affects vitamin D metabolism, such as kidney disease or certain bone disorders.
Routine testing can also be expensive and inconvenient.
In most cases, the recommended approach to over-75s is to consider a daily supplement, without the need for testing.
You can also try to boost your vitamin D by adding fortified foods to your diet, which might lower the dose you need from supplementation.
Even if you’re getting a few minutes of sunlight a day, a daily vitamin D is still recommended.
Elina Hypponen, Professor of Nutritional and Genetic Epidemiology, University of South Australia and Joshua Sutherland, PhD Candidate – Nutrition and Genetic Epidemiology, University of South Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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How To Improve Your Heart Rate Variability
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How’s your heart rate variability?
The hallmarks of a good, strong cardiovascular system include a medium-to-low resting heart rate (for adults: under 60 beats per minute is good; under 50 is typical of athletes), and healthy blood pressure (for adults: under 120/80, while still above 90/60, is generally considered good).
Less talked-about is heart rate variability, but it’s important too…
What is heart rate variability?
Heart rate variability is a measure of how quickly and easily your heart responds to changes in demands placed upon it. For example:
- If you’re at rest and then start running your fastest (be it for leisure or survival or anything in between), your heart rate should be able to jump from its resting rate to about 180% of that as quickly as possible
- When you stop, your heart rate should be able to shift gears back to your resting rate as quickly as possible
The same goes, to a commensurately lesser extent, to changes in activity between low and moderate, or between moderate and high.
- When your heart can change gears quickly, that’s called a high heart rate variability
- When your heart is sluggish to get going and then takes a while to return to normal after exertion, that’s called a low heart rate variability.
The rate of change (i.e., the variability) is measured in microseconds per beat, and the actual numbers will vary depending on a lot of factors, but for everyone, higher is better than lower.
Aside from quick response to crises, why does it matter?
If heart rate variability is low, it means the sympathetic nervous system is dominating the parasympathetic nervous system, which means, in lay terms, your fight-or-flight response is overriding your ability to relax.
See for example: Stress and Heart Rate Variability: A Meta-Analysis and Review of the Literature
This has a lot of knock-on effects for both physical and mental health! Your heart and brain will take the worst of this damage, so it’s good to improve things for them impossible.
This Saturday’s Life Hacks: how to improve your HRV!
Firstly, the Usual Five Things™:
- A good diet (that avoids processed foods)
- Good exercise (that includes daily physical activity—more often is more important than more intense!)
- Good sleep (7–9 hours of good quality sleep per night)
- Reduce or eliminate alcohol consumption (this is dose-dependent; any reduction is an improvement)
- Don’t smoke (just don’t)
Additional regular habits that help a lot:
- Breathing exercises, mindfulness, meditation
- Therapy, especially CBT and DBT
- Stress-avoidance strategies, for example:
- Get (and maintain) your finances in good order
- Get (and maintain) your relationship(s) in good order
- Get (and maintain) your working* life in good order
*Whatever this means to you. If you’re perhaps retired, or otherwise a home-maker, or even a student, the things you “need to do” on a daily basis are your working life, for these purposes.
In terms of simple, quick-fix, physical tweaks to focus on if you’re already broadly leading a good life, two great ones are:
- Exercise: get moving! Walk to the store even if you buy nothing but a snack or drink to enjoy while walking back. If you drove, make more trips with the shopping bags rather than fewer. If you like to watch TV, consider an exercise bike or treadmill to use while watching. If you have a partner, double-up and make it a thing you do together! Take the stairs instead of the elevator. Take the scenic route when walking someplace. Go to the bathroom that’s further away. Every little helps!
- Breathe: even just a couple of times a day, practice mindful breathing. Start with even just a minute a day, to get the habit going. What breathing exercise you do isn’t so important as that you do it. Notice your breathing; count how long each breath takes. Don’t worry about “doing it right”—you’re doing great, just observe, just notice, just slowly count. We promise that regular practice of this will have you feeling amazing
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Curious Kids: what are the main factors in forming someone’s personality?
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“What are the main factors in forming someone’s personality?” – Emma, age 10, from Shanghai
Hello Emma, and thank you for this very interesting question!
Let’s start by exploring what we mean by personality. Have you noticed no two people are completely alike? We all see, experience, and understand the world in different ways.
For example, some people love spending time with friends and being the centre of attention, whereas other people are more shy and enjoy having time to themselves.
Your unique personality is shaped by your genes as well as various influences in your environment. And your personality plays an important role in how you interact with the world.
The big five
Did you know there are scientists who spend time researching personality? Their research is concerned with describing the ways people differ from each other, and understanding how these differences could be important for other parts of life such as our health and how well we do in school or at work.
There are many different perspectives on personality. A widely accepted viewpoint based on a lot of research is called the five factor model or the “big five”. According to this theory, a great deal of a person’s personality can be summarised in terms of where they sit on five dimensions, called traits:
- the introversion-extraversion trait refers to how much someone is outgoing and social (extroverted) or prefers being with smaller groups of friends or focusing on their own thoughts (introverted)
- agreeableness captures how much someone tends to be cooperative and helps others
- openness to experience refers to how much a person is creative and enjoys experiencing new things
- neuroticism describes a person’s tendency to experience negative feelings, like worrying about things that could go wrong
- conscientiousness encompasses how much a person is organised, responsible, and dedicated to things that are important to them, like schoolwork or training for a sports team.
A person can have high, low, or moderate levels of each of these traits. And understanding whether someone has higher or lower levels of the big five can tell us a lot about how we might expect them to behave in different situations.
So what shapes our personalities?
A number of factors shape our personalities, including our genes and social environment.
Our bodies are made up of many very small structures called cells. Within these cells are genes. We inherit genes from our parents, and they carry the information needed to make our bodies and personalities. So, your personality may be a bit like your parents’ personalities. For example, if you’re an outgoing sort of person who loves to meet new people, perhaps one or both of your parents are very social too.
Our personalities are influenced by the genes we get from our parents.
KieferPix/ShutterstockPersonalities are also affected by our environment, such as our experiences and our relationships with family and friends. For example, some research has shown our relationships with our parents can influence our personality. If we have loving and warm relationships, we may be more agreeable and open. But if our relationships are hurtful or stressful, this may increase our neuroticism.
Another study showed that, over time, young children who were more physically active were less introverted (less shy) and less likely to get very upset when things don’t go their way, compared to children who were less physically active. Although we don’t know why this is for sure, one possible explanation is that playing sport leads to reduced shyness because it introduces children to different people.
While we’re learning more about personality development all the time, research in this area presents quite a few challenges. Many different biological, cultural and environmental influences shape our development, and these factors can interact with each other in complex ways.
Is our personality fixed once we become adults?
Although we develop most of our personality when we are young, and people’s personalities tend to become more stable as they get older, it is possible for aspects of a person’s personality to change, even when they are fully grown.
A good example of this can be seen among people who seek treatment for conditions like anxiety or depression. People who respond well to working with a psychologist can show decreases in neuroticism, indicating they become less likely to worry a lot or feel strong negative feelings when something stressful happens.
Hello, Curious Kids! Do you have a question you’d like an expert to answer? Ask an adult to send your question to mailto:curiouskids@theconversation.edu.au
Tim Windsor, Professor, Director, Generations Research Initiative, College of Education, Psychology and Social Work, Flinders University and Natalie Goulter, Lecturer, College of Education, Psychology and Social Work, Flinders University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Antibiotics? Think Thrice
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Antibiotics: Useful Even Less Often Than Previously Believed (And Still Just As Dangerous)
You probably already know that antibiotics shouldn’t be taken unless absolutely necessary. Not only does taking antibiotics frivolously increase antibiotic resistance (which is bad, and kills people), but also…
It’s entirely possible for the antibiotics to not only not help, but instead wipe out your gut’s “good bacteria” that were keeping other things in check.
Those “other things” can include fungi like Candida albicans.
Candida, which we all have in us to some degree, feeds on sugar (including the sugar formed from breaking down alcohol, by the way) and refined carbs. Then it grows, and puts its roots through your intestinal walls, linking with your neural system. Then it makes you crave the very things that will feed it and allow it to put bigger holes in your intestinal walls.
Don’t believe us? Read: Candida albicans-Induced Epithelial Damage Mediates Translocation through Intestinal Barriers
(That’s scientist-speak for “Candida puts holes in your intestines, and stuff can then go through those holes”)
And as for how that comes about, it’s like we said:
See also: Candida albicans as a commensal and opportunistic pathogen in the intestine
That’s not all…
And that’s just C. albicans, never mind things like C. diff. that can just outright kill you easily.
We don’t have room to go into everything here, but you might like to check out:
Four Ways Antibiotics Can Kill You
It gets worse (now comes the new news)
So, what are antibiotics good for? Surely, for clearing up chesty coughs, lower respiratory tract infections, right? It’s certainly one of the two things that antibiotics are most well-known for being good at and often necessary for (the other being preventing/treating sepsis, for example in serious and messy wounds).
But wait…
A large, nationwide (US) observational study of people who sought treatment in primary or urgent care settings for lower respiratory tract infections found…
(drumroll please)
…the use of antibiotics provided no measurable impact on the severity or duration of coughs even if a bacterial infection was present.
Read for yourself:
And in the words of the lead author of that study,
❝Lower respiratory tract infections tend to have the potential to be more dangerous, since about 3% to 5% of these patients have pneumonia. But not everyone has easy access at an initial visit to an X-ray, which may be the reason clinicians still give antibiotics without any other evidence of a bacterial infection.❞
So, what’s to be done about this? On a large scale, Dr. Merenstein recommends:
❝Serious cough symptoms and how to treat them properly needs to be studied more, perhaps in a randomized clinical trial as this study was observational and there haven’t been any randomized trials looking at this issue since about 2012.❞
This does remind us that, while not a RCT, there is a good ongoing observational study that everyone with a smartphone can participate in:
Dr. Peter Small’s medical AI: “The Cough Doctor”
In the meantime, he advises that when COVID and SARS have been ruled out, then “basic symptom-relieving medications plus time brings a resolution to most people’s infections”.
You can read a lot more detail here:
Antibiotics aren’t effective for most lower tract respiratory infections
In summary…
Sometimes, antibiotics really are a necessary and life-saving medication. But most of the time they’re not, and given their great potential for harm, they may be best simultaneously viewed as the very dangerous threat they also are, and used only when those “heavy guns” are truly what’s required.
Take care!
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