Is owning a dog good for your health?
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Australia loves dogs. We have one of the highest rates of pet ownership in the world, and one in two households has at least one dog.
But are they good for our health?
Mental health is the second-most common reason cited for getting a dog, after companionship. And many of us say we “feel healthier” for having a dog – and let them sleep in our bedroom.
Here’s what it means for our physical and mental health to share our homes (and doonas) with our canine companions.
Are there physical health benefits to having a dog?
Having a dog is linked to lower risk of death over the long term. In 2019, a systematic review gathered evidence published over 70 years, involving nearly four million individual medical cases. It found people who owned a dog had a 24% lower risk of dying from any cause compared to those who did not own a dog.
Dog ownership was linked to increased physical activity. This lowered blood pressure and helped reduce the risk of stroke and heart disease.
The review found for those with previous heart-related medical issues (such as heart attack), living with a dog reduced their subsequent risk of dying by 35%, compared to people with the same history but no dog.
Another recent UK study found adult dog owners were almost four times as likely to meet daily physical activity targets as non-owners. Children in households with a dog were also more active and engaged in more unstructured play, compared to children whose family didn’t have a dog.
Exposure to dirt and microbes carried in from outdoors may also strengthen immune systems and lead to less use of antibiotics in young children who grow up with dogs.
Health risks
However, dogs can also pose risks to our physical health. One of the most common health issues for pet owners is allergies.
Dogs’ saliva, urine and dander (the skin cells they shed) can trigger allergic reactions resulting in a range of symptoms, from itchy eyes and runny nose to breathing difficulties.
A recent meta-analysis pooled data from nearly two million children. Findings suggested early exposure to dogs may increase the risk of developing asthma (although not quite as much as having a cat does). The child’s age, how much contact they have with the dog and their individual risk all play a part.
Slips, trips and falls are another risk – more people fall over due to dogs than cats.
Having a dog can also expose you to bites and scratches which may become infected and pose a risk for those with compromised immune systems. And they can introduce zoonotic diseases into your home, including ring worm and Campylobacter, a disease that causes diarrhoea.
For those sharing the bed there is an elevated the risk of allergies and picking up ringworm. It may result in lost sleep, as dogs move around at night.
On the other hand some owners report feeling more secure while co-sleeping with their dogs, with the emotional benefit outweighing the possibility of sleep disturbance or waking up with flea bites.
Proper veterinary care and hygiene practices are essential to minimise these risks.
What about mental health?
Many people know the benefits of having a dog are not only physical.
As companions, dogs can provide significant emotional support helping to alleviate symptoms of anxiety, depression and post-traumatic stress. Their presence may offer comfort and a sense of purpose to individuals facing mental health challenges.
Loneliness is a significant and growing public health issue in Australia.
In the dog park and your neighbourhood, dogs can make it easier to strike up conversations with strangers and make new friends. These social interactions can help build a sense of community belonging and reduce feelings of social isolation.
For older adults, dog walking can be a valuable loneliness intervention that encourages social interaction with neighbours, while also combating declining physical activity.
However, if you’re experiencing chronic loneliness, it may be hard to engage with other people during walks. An Australian study found simply getting a dog was linked to decreased loneliness. People reported an improved mood – possibly due to the benefits of strengthening bonds with their dog.
What are the drawbacks?
While dogs can bring immense joy and numerous health benefits, there are also downsides and challenges. The responsibility of caring for a dog, especially one with behavioural issues or health problems, can be overwhelming and create financial stress.
Dogs have shorter lifespans than humans, and the loss of a beloved companion can lead to depression or exacerbate existing mental health conditions.
Lifestyle compatibility and housing conditions also play a significant role in whether having a dog is a good fit.
The so-called pet effect suggests that pets, often dogs, improve human physical and mental health in all situations and for all people. The reality is more nuanced. For some, having a pet may be more stressful than beneficial.
Importantly, the animals that share our homes are not just “tools” for human health. Owners and dogs can mutually benefit when the welfare and wellbeing of both are maintained.
Tania Signal, Professor of Psychology, School of Health, Medical and Applied Sciences, CQUniversity Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Cardiac Failure Explained – by Dr. Warrick Bishop
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The cover of this book makes it look like it’ll be a flashy semi-celebrity doctor keen to sell his personalized protocol, along with eleventy-three other books, but actually, what’s inside this one is very different:
We (hopefully) all know the basics of heart health, but this book takes it a lot further. Starting with the basics, then the things that it’s easy to feel like you should know but actually most people don’t, then into much more depth.
The format is much more like a university textbook than most pop-science books, and everything about the way it’s written is geared for maximum learning. The one thing it does keep in common with pop-science books as a genre is heavy use of anecdotes to illustrate points—but he’s just as likely to use tables, diagrams, callout boxes, emboldening of key points, recap sections, and so forth. And for the most part, this book is very information-dense.
Dr. Bishop also doesn’t just stick to what’s average, and talks a lot about aberrations from the norm, what they mean and what they do and yes, what to do about them.
On the one hand, it’s more information dense than the average reader can reasonably expect to need… On the other hand, isn’t it great to finish reading a book feeling like you just did a semester at medical school? No longer will you be baffled by what is going on in your (or perhaps a loved one’s) cardiac health.
Bottom line: if you’d like to know cardiac health inside out, this book is an excellent place to start.
Click here to check out Cardiac Failure Explained, and get to the heart of things!
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Microplastics are in our brains. How worried should I be?
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Plastic is in our clothes, cars, mobile phones, water bottles and food containers. But recent research adds to growing concerns about the impact of tiny plastic fragments on our health.
A study from the United States has, for the first time, found microplastics in human brains. The study, which has yet to be independently verified by other scientists, has been described in the media as scary, shocking and alarming.
But what exactly are microplastics? What do they mean for our health? Should we be concerned?
Daniel Megias/Shutterstock What are microplastics? Can you see them?
We often consider plastic items to be indestructible. But plastic breaks down into smaller particles. Definitions vary but generally microplastics are smaller than five millimetres.
This makes some too small to be seen with the naked eye. So, many of the images the media uses to illustrate articles about microplastics are misleading, as some show much larger, clearly visible pieces.
Microplastics have been reported in many sources of drinking water and everyday food items. This means we are constantly exposed to them in our diet.
Such widespread, chronic (long-term) exposure makes this a serious concern for human health. While research investigating the potential risk microplastics pose to our health is limited, it is growing.
How about this latest study?
The study looked at concentrations of microplastics in 51 samples from men and women set aside from routine autopsies in Albuquerque, New Mexico. Samples were from the liver, kidney and brain.
These tiny particles are difficult to study due to their size, even with a high-powered microscope. So rather than trying to see them, researchers are beginning to use complex instruments that identify the chemical composition of microplastics in a sample. This is the technique used in this study.
The researchers were surprised to find up to 30 times more microplastics in brain samples than in the liver and kidney.
They hypothesised this could be due to high blood flow to the brain (carrying plastic particles with it). Alternatively, the liver and kidneys might be better suited to dealing with external toxins and particles. We also know the brain does not undergo the same amount of cellular renewal as other organs in the body, which could make the plastics linger here.
The researchers also found the amount of plastics in brain samples increased by about 50% between 2016 and 2024. This may reflect the rise in environmental plastic pollution and increased human exposure.
The microplastics found in this study were mostly composed of polyethylene. This is the most commonly produced plastic in the world and is used for many everyday products, such as bottle caps and plastic bags.
This is the first time microplastics have been found in human brains, which is important. However, this study is a “pre-print”, so other independent microplastics researchers haven’t yet reviewed or validated the study.
The most common plastic found was polyethylene, which is used to make plastic bags and bottle caps. Maciej Bledowski/Shutterstock How do microplastics end up in the brain?
Microplastics typically enter the body through contaminated food and water. This can disrupt the gut microbiome (the community of microbes in your gut) and cause inflammation. This leads to effects in the whole body via the immune system and the complex, two-way communication system between the gut and the brain. This so-called gut-brain axis is implicated in many aspects of health and disease.
We can also breathe in airborne microplastics. Once these particles are in the gut or lungs, they can move into the bloodstream and then travel around the body into various organs.
Studies have found microplastics in human faeces, joints, livers, reproductive organs, blood, vessels and hearts.
Microplastics also migrate to the brains of wild fish. In mouse studies, ingested microplastics are absorbed from the gut into the blood and can enter the brain, becoming lodged in other organs along the way.
To get into brain tissue, microplastics must cross the blood-brain-barrier, an intricate layer of cells that is supposed to keep things in the blood from entering the brain.
Although concerning, this is not surprising, as microplastics must cross similar cell barriers to enter the urine, testes and placenta, where they have already been found in humans.
Is this a health concern?
We don’t yet know the effects of microplastics in the human brain. Some laboratory experiments suggest microplastics increase brain inflammation and cell damage, alter gene expression and change brain structure.
Aside from the effects of the microplastic particles themselves, microplastics might also pose risks if they carry environmental toxins or bacteria into and around the body.
Various plastic chemicals could also leach out of the microplastics into the body. These include the famous hormone-disrupting chemicals known as BPAs.
But microplastics and their effects are difficult to study. In addition to their small size, there are so many different types of plastics in the environment. More than 13,000 different chemicals have been identified in plastic products, with more being developed every year.
Microplastics are also weathered by the environment and digestive processes, and this is hard to reproduce in the lab.
A goal of our research is to understand how these factors change the way microplastics behave in the body. We plan to investigate if improving the integrity of the gut barrier through diet or probiotics can prevent the uptake of microplastics from the gut into the bloodstream. This may effectively stop the particles from circulating around the body and lodging into organs.
How do I minimise my exposure?
Microplastics are widespread in the environment, and it’s difficult to avoid exposure. We are just beginning to understand how microplastics can affect our health.
Until we have more scientific evidence, the best thing we can do is reduce our exposure to plastics where we can and produce less plastic waste, so less ends up in the environment.
An easy place to start is to avoid foods and drinks packaged in single-use plastic or reheated in plastic containers. We can also minimise exposure to synthetic fibres in our home and clothing.
Sarah Hellewell, Senior Research Fellow, The Perron Institute for Neurological and Translational Science, and Research Fellow, Faculty of Health Sciences, Curtin University; Anastazja Gorecki, Teaching & Research Scholar, School of Health Sciences, University of Notre Dame Australia, and Charlotte Sofield, PhD Candidate, studying microplastics and gut/brain health, University of Notre Dame Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Planning Ahead For Better Sleep
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Sleep: 6 Dimensions And 24 Hours!
This is Dr. Lisa Matricciani, a sleep specialist from the University of South Australia, where she teaches in the School of Health Sciences.
What does she want us to know?
Healthy sleep begins before breakfast
The perfect bedtime routine is all well and good, but we need to begin much earlier in the day, Dr. Matricciani advises.
Specifically, moderate to vigorous activity early in the day plays a big part.
Before breakfast is best, but even midday/afternoon exercise is associated with better sleep at night.
Read more: Daytime Physical Activity is Key to Unlocking Better Sleep
Plan your time well to sleep—but watch out!
Dr. Matricciani’s research has also found that while it’s important to plan around getting a good night’s sleep (including planning when this will happen), allocating too much time for sleep results in more restless sleep:
❝Allocating more time to sleep was associated with earlier sleep onsets, later sleep offsets, less efficient and more consistent sleep patterns for both children and adults.❞
Read more: Time use and dimensions of healthy sleep: A cross-sectional study of Australian children and adults
(this was very large study involving 1,168 children and 1.360 adults, mostly women)
What counts as good sleep quality? Is it just efficiency?
It is not! Although that’s one part of it. You may remember our previous main feature:
The 6 Dimensions Of Sleep (And Why They Matter)
Dr. Matricciani agrees:
❝Everyone knows that sleep is important. But when we think about sleep, we mainly focus on how many hours of sleep we get, when we should also be looking at our sleep experience as a whole❞
Read more: Trouble sleeping? You could be at risk of type 2 diabetes
That’s not a cheery headline, but here’s her paper about it:
And no, we don’t get a free pass on getting less sleep / less good quality sleep as we get older (alas):
Why You Probably Need More Sleep
So, time to get planning for the best sleep!
Enjoy videos?
Here’s how 7News Australia broke the news of Dr. Matricciani’s more recent work:
Rest well!
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Apple vs Pear – Which is Healthier?
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Our Verdict
When comparing apple to pear, we picked the pear.
Why?
Both are great! But there’s a category that puts pears ahead of apples…
Looking at their macros first, pears contain more carbs but also more fiber. Both are low glycemic index foods, though.
In the category of vitamins, things are moderately even: apples contain more of vitamins A, B1, B6, and E, while pears contain more of vitamins B3, B9, K, and choline. That’s a 4:4 split, and the two fruits are about equal in the other vitamins they both contain.
When it comes to minerals, pears contain more calcium, copper, iron, magnesium, manganese, phosphorus, potassium, selenium, and zinc. A resounding victory for pears, as apples are not higher in any mineral.
In short, if an apple a day keeps the doctor away, a pear should keep the doctor away for about a day and a half, based on the extra nutrients ← this is slightly facetious as medicine doesn’t work like that, but you get the idea: pears simply have more to offer. Apples are still great though! Enjoy both! Diversity is good.
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 Metformin Slows Aging
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Metformin And How It Slows Down Aging
That’s a bold claim for a title, but the scientific consensus is clear, and this Research Review Monday we’re going to take a look at exactly that!
Metformin is a common diabetes-management drug, used to lower blood sugar levels in people who either don’t have enough insulin or the insulin isn’t being recognized well enough by the body.
However, it also slows aging, which is a quality it’s also been studied for for more than a decade. We’ll look at some of the more recent research, though. Let’s kick off with an initial broad statement, from the paper “The Use of Metformin to Increase the Human Healthspan”, as part of the “Advances in Experimental Medicine and Biology” series:
In recent years, more attention has been paid to the possibility of using metformin as an anti-aging drug. It was shown to significantly increase the lifespan in some model organisms and delay the onset of age-associated declines. Growing amounts of evidence from clinical trials suggest that metformin can effectively reduce the risk of many age-related diseases and conditions, including cardiometabolic disorders, neurodegeneration, chronic inflammation and frailty.
How does it work?
That’s still being studied, but the scientific consensus is that it works by inducing hormesis—the process by which minor stress signals cells to start repairing themselves. How does it induce that hormesis? Again, still being studied, but it appears to do it by activating a specific enzyme; namely, the AMP-activated protein kinase:
Read: Metformin-enhances resilience via hormesis
It also has been found to slow aging by means of an anti-inflammatory effect, as a bonus!
Any bad news?
Well, firstly, in most places it’s only prescribed for diabetes management, not for healthy life extension. A lot of anti-aging enthusiasts have turned to the grey market online to get it, and we can’t recommend that.
Secondly, it does have some limitations:
- Its bioavailability isn’t great in tablet form (the form in which it is most commonly given)
- It has quite a short elimination half-life (around 6 hours), which makes it great to fix transient hyperglycemia in diabetics—job done and it’s out—but presents a logistical challenge when it comes to something so pernicious as aging.
- Some people are non-responders (a non-responder, in medicine, is someone for whom a drug simply doesn’t work, for no obvious reason)
Want to know more? Check out:
Metformin in aging and aging-related diseases: clinical applications and relevant mechanism
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Under Pressure: A Guide To Controlling High Blood Pressure – by Dr. Frita Fisher
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Hypertension kills a lot of people, and does so with little warning—it can be asymptomatic before it gets severe enough to cause harm, and once it causes harm, well, one heart attack or stroke is already one too many.
Aimed more squarely at people in the 35–45 danger zone (young enough to not be getting regular blood pressure checks, old enough that it may have been building up for decades), this is a very good primer on blood pressure, factors affecting it, what goes wrong, what to do about it, and how to make a good strategy for managing it for life.
The style is easy-reading, making this short (91 pages) book a very quick read, but an informative one.
Bottom line: if you are already quite knowledgeable about blood pressure and blood pressure management, this one’s probably not for you. But if you’re in the category of “what do those numbers mean again?”, then this is a very handy book to have, to get you up to speed so that you can handle things as appropriate.
Click here to check out Under Pressure, and get/keep yours under control!
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