With all this bird flu around, how safe are eggs, chicken or milk?
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Enzo Palombo, Swinburne University of Technology
Recent outbreaks of bird flu – in US dairy herds, poultry farms in Australia and elsewhere, and isolated cases in humans – have raised the issue of food safety.
So can the virus transfer from infected farm animals to contaminate milk, meat or eggs? How likely is this?
And what do we need to think about to minimise our risk when shopping for or preparing food?
How safe is milk?
Bird flu (or avian influenza) is a bird disease caused by specific types of influenza virus. But the virus can also infect cows. In the US, for instance, to date more than 80 dairy herds in at least nine states have been infected with the H5N1 version of the virus.
Investigations are under way to confirm how this happened. But we do know infected birds can shed the virus in their saliva, nasal secretions and faeces. So bird flu can potentially contaminate animal-derived food products during processing and manufacturing.
Indeed, fragments of bird flu genetic material (RNA) were found in cow’s milk from the dairy herds associated with infected US farmers.
However, the spread of bird flu among cattle, and possibly to humans, is likely to have been caused through contact with contaminated milking equipment, not the milk itself.
The test used to detect the virus in milk – which uses similar PCR technology to lab-based COVID tests – is also highly sensitive. This means it can detect very low levels of the bird flu RNA. But the test does not distinguish between live or inactivated virus, just that the RNA is present. So from this test alone, we cannot tell if the virus found in milk is infectious (and capable of infecting humans).
Does that mean milk is safe to drink and won’t transmit bird flu? Yes and no.
In Australia, where bird flu has not been reported in dairy cattle, the answer is yes. It is safe to drink milk and milk products made from Australian milk.
In the US, the answer depends on whether the milk is pasteurised. We know pasteurisation is a common and reliable method of destroying concerning microbes, including influenza virus. Like most viruses, influenza virus (including bird flu virus) is inactivated by heat.
Although there is little direct research on whether pasteurisation inactivates H5N1 in milk, we can extrapolate from what we know about heat inactivation of H5N1 in chicken and eggs.
So we can be confident there is no risk of bird flu transmission via pasteurised milk or milk products.
However, it’s another matter for unpasteurised or “raw” US milk or milk products. A recent study showed mice fed raw milk contaminated with bird flu developed signs of illness. So to be on the safe side, it would be advisable to avoid raw milk products.
How about chicken?
Bird flu has caused sporadic outbreaks in wild birds and domestic poultry worldwide, including in Australia. In recent weeks, there have been three reported outbreaks in Victorian poultry farms (two with H7N3 bird flu, one with H7N9). There has been one reported outbreak in Western Australia (H9N2).
The strains of bird flu identified in the Victorian and Western Australia outbreaks can cause human infection, although these are rare and typically result from close contact with infected live birds or contaminated environments.
Therefore, the chance of bird flu transmission in chicken meat is remote.
Nonetheless, it is timely to remind people to handle chicken meat with caution as many dangerous pathogens, such as Salmonella and Campylobacter, can be found on chicken carcasses.
Always handle chicken meat carefully when shopping, transporting it home and storing it in the kitchen. For instance, make sure no meat juices cross-contaminate other items, consider using a cool bag when transporting meat, and refrigerate or freeze the meat within two hours.
Avoid washing your chicken before cooking to prevent the spread of disease-causing microbes around the kitchen.
Finally, cook chicken thoroughly as viruses (including bird flu) cannot survive cooking temperatures.
Are eggs safe?
The recent Australian outbreaks have occurred in egg-laying or mixed poultry flocks, so concerns have been raised about bird flu transmission via contaminated chicken eggs.
Can flu viruses contaminate chicken eggs and potentially spread bird flu? It appears so. A report from 2007 said it was feasible for influenza viruses to enter through the eggshell. This is because influenza virus particles are smaller (100 nanometres) than the pores in eggshells (at least 200 nm).
So viruses could enter eggs and be protected from cleaning procedures designed to remove microbes from the egg surface.
Therefore, like the advice about milk and meat, cooking eggs is best.
The US Food and Drug Administration recommends cooking poultry, eggs and other animal products to the proper temperature and preventing cross-contamination between raw and cooked food.
In a nutshell
If you consume pasteurised milk products and thoroughly cook your chicken and eggs, there is nothing to worry about as bird flu is inactivated by heat.
The real fear is that the virus will evolve into highly pathogenic versions that can be transmitted from human to human.
That scenario is much more frightening than any potential spread though food.
Enzo Palombo, Professor of Microbiology, Swinburne University of Technology
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Dates vs Prunes – Which is Healthier?
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Our Verdict
When comparing dates to prunes, we picked the prunes.
Why?
First let’s note: we’re listing the second fruit here as “prunes” rather than “plums”, since prunes are dehydrated plums, and it makes more sense to compare the dried fruit to dates which are invariably dried too. Otherwise, the water weight of plums would unfairly throw out the nutrient proportions per 100g (indeed, upon looking up numbers, dates would overwhelmingly beat plums easily in the category of pretty much every nutrient).
So let’s look at the fairer comparison:
In terms of macros, dates have a little more protein, carbohydrate, and fiber. This is because while both are dried, prunes are usually sold with more water remaining than dates; indeed, per 100g prunes still have 30g water weight to dates’ 20g water weight. This makes everything close, but we are going to call this category a nominal win for dates. Mind you, hydration is still good, but please do not rely on dried fruit for your hydration!
When it comes to vitamins, dates have more of vitamins B5 and B9, while prunes have more of vitamins A, B2, B3, B6, C, E, K, and choline. A clear win for prunes here.
In the category of minerals, it’s a similar story: dates have more iron, magnesium, and selenium, while prunes have more calcium, copper, manganese, phosphorus, potassium, and zinc. Another win for prunes.
In short, enjoy either or both, but prunes win on overall nutritional density!
Want to learn more?
You might like to read:
From Apples to Bees, and High-Fructose Cs: Which Sugars Are Healthier, And Which Are Just The Same?
Take care!
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How To Avoid Slipping Into (Bad) Old Habits
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Treating Bad Habits Like Addictions
How often have you started a healthy new habit (including if it’s a “quit this previous thing” new habit), only to find that you slip back into your old ways?
We’ve written plenty on habit-forming before, so here’s a quick recap before we continue:
How To Really Pick Up (And Keep!) Those Habits
…and even how to give them a boost:
How To Keep On Keeping On… Long Term!
But how to avoid the relapses that are most likely to snowball?
Borrowing from the psychology of addiction recovery
It’s well known that someone recovering from substance addiction should not have even a small amount of the thing they were addicted to. Not one sip of champagne at a wedding, not one drag of a cigarette, and so forth.
This can go for other bad habits too; make one exception, and suddenly you have a whole string of “exceptions”, and before you know it, it’s not the exception anymore; it’s the new rule—again.
Three things that can help guard against this are:
- Absolutely refuse to romanticize the bad habit. Do not fall for its marketing! And yes, everything has marketing even if not advertising; for example, consider the Platonic ideal of a junk-food-eating couch-potato who is humble, unassuming, agreeable, the almost-holy idea of homely comfort, and why shouldn’t we be comfortable after all, haven’t we earned our chosen hedonism, and so on. It’s seductive, and we need to make the choice to not be seduced by it. In this case for example, yes pleasure is great, but being sick tired and destroying our bodies is not, in fact, pleasurable in the long run. Which brings us to…
- Absolutely refuse to forget why you dropped that behavior in the first place. Remember what it did to you, remember you at your worst. Remember what you feared might become of you if you continued like that. This is something where journaling helps, by the way; remembering our low points helps us to avoid finding ourselves in the same situation again.
- Absolutely refuse to let your guard down due to an overabundance of self-confidence in your future self. We all can easily feel that tomorrow is a mystical land in which all productivity is stored, and also where we are strong, energized, iron-willed, and totally able to avoid making the very mistakes that we are right now in the process of making. Instead, be that strong person now, for the benefit of tomorrow’s you. Because after all, if it’s going to be easy tomorrow, it’s easy now, right?
The above is a very simple, hopefully practical, set of rules to follow. If you like hard science more though, Yale’s Dr. Steven Melemis offers five rules (aimed more directly at addiction recovery, so this may be a big “heavy guns” for some milder habits):
- change your life
- be completely honest
- ask for help
- practice self-care
- don’t bend the rules
You can read his full paper and the studies it’s based on, here:
Relapse Prevention and the Five Rules of Recovery
“What if I already screwed up?”
Draw a line under it, now, and move forwards in the direction you actually want to go.
Here’s a good article, that saves us taking up more space here; it’s very well-written so we do recommend it:
The Abstinence Violation Effect and Overcoming It
this article gives specific, practical advices, including CBT tools to use
Take care!
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Thinking of using an activity tracker to achieve your exercise goals? Here’s where it can help – and where it probably won’t
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It’s that time of year when many people are getting started on their resolutions for the year ahead. Doing more physical activity is a popular and worthwhile goal.
If you’re hoping to be more active in 2024, perhaps you’ve invested in an activity tracker, or you’re considering buying one.
But what are the benefits of activity trackers? And will a basic tracker do the trick, or do you need a fancy one with lots of features? Let’s take a look.
Why use an activity tracker?
One of the most powerful predictors for being active is whether or not you are monitoring how active you are.
Most people have a vague idea of how active they are, but this is inaccurate a lot of the time. Once people consciously start to keep track of how much activity they do, they often realise it’s less than what they thought, and this motivates them to be more active.
You can self-monitor without an activity tracker (just by writing down what you do), but this method is hard to keep up in the long run and it’s also a lot less accurate compared to devices that track your every move 24/7.
By tracking steps or “activity minutes” you can ascertain whether or not you are meeting the physical activity guidelines (150 minutes of moderate to vigorous physical activity per week).
It also allows you to track how you’re progressing with any personal activity goals, and view your progress over time. All this would be difficult without an activity tracker.
Research has shown the most popular brands of activity trackers are generally reliable when it comes to tracking basic measures such as steps and activity minutes.
But wait, there’s more
Many activity trackers on the market nowadays track a range of other measures which their manufacturers promote as important in monitoring health and fitness. But is this really the case? Let’s look at some of these.
Resting heart rate
This is your heart rate at rest, which is normally somewhere between 60 and 100 beats per minute. Your resting heart rate will gradually go down as you become fitter, especially if you’re doing a lot of high-intensity exercise. Your risk of dying of any cause (all-cause mortality) is much lower when you have a low resting heart rate.
So, it is useful to keep an eye on your resting heart rate. Activity trackers are pretty good at tracking it, but you can also easily measure your heart rate by monitoring your pulse and using a stopwatch.
Heart rate during exercise
Activity trackers will also measure your heart rate when you’re active. To improve fitness efficiently, professional athletes focus on having their heart rate in certain “zones” when they’re exercising – so knowing their heart rate during exercise is important.
But if you just want to be more active and healthier, without a specific training goal in mind, you can exercise at a level that feels good to you and not worry about your heart rate during activity. The most important thing is that you’re being active.
Also, a dedicated heart rate monitor with a strap around your chest will do a much better job at measuring your actual heart rate compared to an activity tracker worn around your wrist.
Maximal heart rate
This is the hardest your heart could beat when you’re active, not something you could sustain very long. Your maximal heart rate is not influenced by how much exercise you do, or your fitness level.
Most activity trackers don’t measure it accurately anyway, so you might as well forget about this one.
VO₂max
Your muscles need oxygen to work. The more oxygen your body can process, the harder you can work, and therefore the fitter you are.
VO₂max is the volume (V) of oxygen (O₂) we could breathe maximally (max) over a one minute interval, expressed as millilitres of oxygen per kilogram of body weight per minute (ml/kg/min). Inactive women and men would have a VO₂max lower than 30 and 40 ml/kg/min, respectively. A reasonably good VO₂max would be mid thirties and higher for women and mid forties and higher for men.
VO₂max is another measure of fitness that correlates well with all-cause mortality: the higher it is, the lower your risk of dying.
For athletes, VO₂max is usually measured in a lab on a treadmill while wearing a mask that measures oxygen consumption. Activity trackers instead look at your running speed (using a GPS chip) and your heart rate and compare these measures to values from other people.
If you can run fast with a low heart rate your tracker will assume you are relatively fit, resulting in a higher VO₂max. These estimates are not very accurate as they are based on lots of assumptions. However, the error of the measurement is reasonably consistent. This means if your VO₂max is gradually increasing, you are likely to be getting fitter.
So what’s the take-home message? Focus on how many steps you take every day or the number of activity minutes you achieve. Even a basic activity tracker will measure these factors relatively accurately. There is no real need to track other measures and pay more for an activity tracker that records them, unless you are getting really serious about exercise.
Corneel Vandelanotte, Professorial Research Fellow: Physical Activity and Health, CQUniversity Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Smarter Tomorrow – by Elizabeth Ricker
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Based heavily in hard science, with more than 450 citations in over 300 pages, the exhortation is not just “trust me, lol”.
Instead, she encourages the reader to experiment. Not like “try this and see if it works”, but “here’s how to try this, using scientific method with good controls and good record-keeping”.
The book is divided into sections, each with a projection of time required at the start and a summary at the end. The reading style is easy-reading throughout, without sacrificing substance.
It proposes seven key interventions. If just one works for you, it’ll be worth having bought and read the book. More likely most if not all will… Because that’s how science works.
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Train For The Event Of Your Life!
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Mobility As A Sporting Pursuit
As we get older, it becomes increasingly important to treat life like a sporting event. By this we mean:
As an “athlete of life”, there are always events coming up for which we need to train. Many of these events will be surprise tests!
Such events/tests might include:
- Not slipping in the shower and breaking a hip (or worse)
- Reaching an item from a high shelf without tearing a ligament
- Getting out of the car at an awkward angle without popping a vertebra
- Climbing stairs without passing out light-headed at the top
- Descending stairs without making it a sled-ride-without-a-sled
…and many more.
Train for these athletic events now
Not necessarily this very second; we appreciate you finishing reading first. But, now generally in your life, not after the first time you fail such a test; it can (and if we’re not attentive: will) indeed happen to us all.
With regard to falling, you might like to revisit our…
…which covers how to not fall, and to not injure yourself if you do.
You’ll also want to be able to keep control of your legs (without them buckling) all the way between standing and being on the ground.
Slav squats or sitting squats (same exercise, different names, amongst others) are great for building and maintaining this kind of strength and suppleness:
(Click here for a refresher if you haven’t recently seen Zuzka’s excellent video explaining how to do this, especially if it’s initially difficult for you, “The Most Anti-Aging Exercise”)
this exercise is, by the way, great for pretty much everything below the waist!
You will also want to do resistance exercises to keep your body robust:
Resistance Is Useful! (Especially As We Get Older)
And as for those shoulders? If it is convenient for you to go swimming, then backstroke is awesome for increasing and maintaining shoulder mobility (and strength).
If swimming isn’t a viable option for you, then doing the same motion with your arms, while standing, will build the same flexibility. If you do it while holding a small weight (even just 1kg is fine, but feel free to increase if you so wish and safely can) in each hand will build the necessary strength as you go too.
As for why even just 1kg is fine: read on
About that “and strength”, by the way…
Stretching is not everything. Stretching is great, but mobility without strength (in that joint!) is just asking for dislocation.
You don’t have to be built like the Terminator, but you do need to have the structural integrity to move your body and then a little bit more weight than that (or else any extra physical work could be enough to tip you to breaking point) without incurring damage from the strain. So, it needs to not be a strain! See again, the aforementioned resistance exercises.
That said, even very gentle exercise helps too; see for example the impact of walking on osteoporosis:
Living near green spaces linked to higher bone density and lower osteoporosis risk
and…
So you don’t have to run marathons—although you can if you want:
Marathons in Mid- and Later-Life
…to keep your hips and more in good order.
Want to test yourself now?
Check out:
Building & Maintaining Mobility
Take care!
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What’s the difference between ADD and ADHD?
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Around one in 20 people has attention-deficit hyperactivity disorder (ADHD). It’s one of the most common neurodevelopmental disorders in childhood and often continues into adulthood.
ADHD is diagnosed when people experience problems with inattention and/or hyperactivity and impulsivity that negatively impacts them at school or work, in social settings and at home.
Some people call the condition attention-deficit disorder, or ADD. So what’s the difference?
In short, what was previously called ADD is now known as ADHD. So how did we get here?
Let’s start with some history
The first clinical description of children with inattention, hyperactivity and impulsivity was in 1902. British paediatrician Professor George Still presented a series of lectures about his observations of 43 children who were defiant, aggressive, undisciplined and extremely emotional or passionate.
Since then, our understanding of the condition evolved and made its way into the Diagnostic and Statistical Manual of Mental Disorders, known as the DSM. Clinicians use the DSM to diagnose mental health and neurodevelopmental conditions.
The first DSM, published in 1952, did not include a specific related child or adolescent category. But the second edition, published in 1968, included a section on behaviour disorders in young people. It referred to ADHD-type characteristics as “hyperkinetic reaction of childhood or adolescence”. This described the excessive, involuntary movement of children with the disorder.
It took a while for ADHD-type behaviour to make in into the diagnostic manual. Elzbieta Sekowska/Shutterstock In the early 1980s, the third DSM added a condition it called “attention deficit disorder”, listing two types: attention deficit disorder with hyperactivity (ADDH) and attention deficit disorder as the subtype without the hyperactivity.
However, seven years later, a revised DSM (DSM-III-R) replaced ADD (and its two sub-types) with ADHD and three sub-types we have today:
- predominantly inattentive
- predominantly hyperactive-impulsive
- combined.
Why change ADD to ADHD?
ADHD replaced ADD in the DSM-III-R in 1987 for a number of reasons.
First was the controversy and debate over the presence or absence of hyperactivity: the “H” in ADHD. When ADD was initially named, little research had been done to determine the similarities and differences between the two sub-types.
The next issue was around the term “attention-deficit” and whether these deficits were similar or different across both sub-types. Questions also arose about the extent of these differences: if these sub-types were so different, were they actually different conditions?
Meanwhile, a new focus on inattention (an “attention deficit”) recognised that children with inattentive behaviours may not necessarily be disruptive and challenging but are more likely to be forgetful and daydreamers.
People with inattentive behaviours may be more forgetful or daydreamers. fizkes/Shutterstock Why do some people use the term ADD?
There was a surge of diagnoses in the 1980s. So it’s understandable that some people still hold onto the term ADD.
Some may identify as having ADD because out of habit, because this is what they were originally diagnosed with or because they don’t have hyperactivity/impulsivity traits.
Others who don’t have ADHD may use the term they came across in the 80s or 90s, not knowing the terminology has changed.
How is ADHD currently diagnosed?
The three sub-types of ADHD, outlined in the DSM-5 are:
- predominantly inattentive. People with the inattentive sub-type have difficulty sustaining concentration, are easily distracted and forgetful, lose things frequently, and are unable to follow detailed instructions
- predominantly hyperactive-impulsive. Those with this sub-type find it hard to be still, need to move constantly in structured situations, frequently interrupt others, talk non-stop and struggle with self control
- combined. Those with the combined sub-type experience the characteristics of those who are inattentive and hyperactive-impulsive.
ADHD diagnoses continue to rise among children and adults. And while ADHD was commonly diagnosed in boys, more recently we have seen growing numbers of girls and women seeking diagnoses.
However, some international experts contest the expanded definition of ADHD, driven by clinical practice in the United States. They argue the challenges of unwanted behaviours and educational outcomes for young people with the condition are uniquely shaped by each country’s cultural, political and local factors.
Regardless of the name change to reflect what we know about the condition, ADHD continues to impact educational, social and life situations of many children, adolescents and adults.
Kathy Gibbs, Program Director for the Bachelor of Education, Griffith University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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