I’m feeling run down. Why am I more likely to get sick? And how can I boost my immune system?
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It has been a long winter, filled with many viruses and cost-of-living pressures, on top of the usual mix of work, study, life admin and caring responsibilities.
Stress is an inevitable part of life. In short bursts, our stress response has evolved as a survival mechanism to help us be more alert in fight or flight situations.
But when stress is chronic, it weakens the immune system and makes us more vulnerable to illnesses such as the common cold, flu and COVID.
Stress makes it harder to fight off viruses
When the immune system starts to break down, a virus that would normally have been under control starts to flourish.
Once you begin to feel sick, the stress response rises, making it harder for the immune system to fight off the disease. You may be sick more often and for longer periods of time, without enough immune cells primed and ready to fight.
In the 1990s, American psychology professor Sheldon Cohen and his colleagues conducted a number of studies where healthy people were exposed to an upper respiratory infection, through drops of virus placed directly into their nose.
These participants were then quarantined in a hotel and monitored closely to determine who became ill.
One of the most important factors predicting who got sick was prolonged psychological stress.
Cortisol suppresses immunity
“Short-term stress” is stress that lasts for a period of minutes to hours, while “chronic stress” persists for several hours per day for weeks or months.
When faced with a perceived threat, psychological or physical, the hypothalamus region of the brain sets off an alarm system. This signals the release of a surge of hormones, including adrenaline and cortisol.
In a typical stress response, cortisol levels quickly increase when stress occurs, and then rapidly drop back to normal once the stress has subsided. In the short term, cortisol suppresses inflammation, to ensure the body has enough energy available to respond to an immediate threat.
But in the longer term, chronic stress can be harmful. A Harvard University study from 2022 showed that people suffering from psychological distress in the lead up to their COVID infection had a greater chance of experiencing long COVID. They classified this distress as depression, probable anxiety, perceived stress, worry about COVID and loneliness.
Those suffering distress had close to a 50% greater risk of long COVID compared to other participants. Cortisol has been shown to be high in the most severe cases of COVID.
Stress causes inflammation
Inflammation is a short-term reaction to an injury or infection. It is responsible for trafficking immune cells in your body so the right cells are present in the right locations at the right times and at the right levels.
The immune cells also store a memory of that threat to respond faster and more effectively the next time.
Initially, circulating immune cells detect and flock to the site of infection. Messenger proteins, known as pro-inflammatory cytokines, are released by immune cells, to signal the danger and recruit help, and our immune system responds to neutralise the threat.
During this response to the infection, if the immune system produces too much of these inflammatory chemicals, it can trigger symptoms such as nasal congestion and runny nose.
What about chronic stress?
Chronic stress causes persistently high cortisol secretion, which remains high even in the absence of an immediate stressor.
The immune system becomes desensitised and unresponsive to this cortisol suppression, increasing low-grade “silent” inflammation and the production of pro-inflammatory cytokines (the messenger proteins).
Immune cells become exhausted and start to malfunction. The body loses the ability to turn down the inflammatory response.
Over time, the immune system changes the way it responds by reprogramming to a “low surveillance mode”. The immune system misses early opportunities to destroy threats, and the process of recovery can take longer.
So how can you manage your stress?
We can actively strengthen our immunity and natural defences by managing our stress levels. Rather than letting stress build up, try to address it early and frequently by:
1) Getting enough sleep
Getting enough sleep reduces cortisol levels and inflammation. During sleep, the immune system releases cytokines, which help fight infections and inflammation.
2) Taking regular exercise
Exercising helps the lymphatic system (which balances bodily fluids as part of the immune system) circulate and allows immune cells to monitor for threats, while sweating flushes toxins. Physical activity also lowers stress hormone levels through the release of positive brain signals.
3) Eating a healthy diet
Ensuring your diet contains enough nutrients – such as the B vitamins, and the full breadth of minerals like magnesium, iron and zinc – during times of stress has a positive impact on overall stress levels. Staying hydrated helps the body to flush out toxins.
4) Socialising and practising meditation or mindfulness
These activities increase endorphins and serotonin, which improve mood and have anti-inflammatory effects. Breathing exercises and meditation stimulate the parasympathetic nervous system, which calms down our stress responses so we can “reset” and reduce cortisol levels.
Sathana Dushyanthen, Academic Specialist & Lecturer in Cancer Sciences & Digital Health| Superstar of STEM| Science Communicator, The University of Melbourne
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Blood-Sugar-Friendly Ice Pops
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This generic food product has so many regional variant names that it’s difficult to get a universal name, but in N. America they’re also known by the genericized brand name of popsicles. Anyway, they’re usually very bad news for blood sugars, being merely frozen juice even if extra sugar wasn’t added. Today’s recipe, on the other hand, makes for a refreshing and nutrient-dense treat that won’t spike your blood glucose!
You will need
- 1 cup fresh blueberries
- 1 can (12oz/400g) coconut milk
- ½ cup yogurt with minimal additives
- 1 tbsp honey (omit if you prefer less sweetness)
- Juice of ¼ lime (increase if you prefer more sourness)
Method
(we suggest you read everything at least once before doing anything)
1) Blend everything
2) Pour into ice pop molds and freeze overnight
3) Serve at your leisure:
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Which Sugars Are Healthier, And Which Are Just The Same?
- 10 Ways To Balance Blood Sugars
- Can Saturated Fats Be Healthy? ← the fats in coconut are a good source of medium-chain triglycerides (MCTs), which are easily broken down as a good energy source and (enjoyed in moderation) thus unlikely to cause any cardiovascular problems, as little to nothing (usually: nothing) of it will be stored.
Take care!
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The Other Significant Others – by Rhaina Cohen
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As we get older, it’s a function of statistics that increasingly many of us are divorced or widowed. While some will—after whatever time seems right to them—get back into dating, what about those of us who decide that we won’t?
Rhaina Cohen explores the importance of friendship, mutual support, and (Platonic!) closeness and yes, even kinds of intimacy (for that too can be Platonic!) as we go on.
Even from a purely evolutionary approach, we are fundamentally social creatures, and while as individuals we may exist on a spectrum from reclusive to extroverted, we all thrive better when we at least have access to community and friends.
The style of the book is easy-reading and exploratory, and is very compelling as a call-to-arms for those who may wish to give/receive support to/from those with whom we are not necessarily sleeping.
Because at the end of the day, why should sex and/or romance be a required feature for legal protections? Aren’t we adults who can make our own decisions about whom we trust to care for us?
Bottom line: if you’re happily partnered and expect to pre-decease your partner, this book might not be directly important for you (it might for your partner, though). Everyone else? This book may be important at some point. That point might even be now already; only you know.
Click here to check out The Other Significant Others, and make your own choices in life!
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What Nobody Teaches You About Strengthening Your Knees
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Strengthening unhappy knees can seem difficult, because many obvious exercises like squats may hurt, and can feel like they are doing harm (and if your knees are bad enough, maybe they are; it depends on many factors). Here’s a way to improve things:
The muscle nobody talks about
Well, not nobody. But, it’s a muscle that’s rarely talked about; namely, the tibialis anterior.
It plays a key role in decelerating knee motion—in other words, the movement that hurts if you have bad knees. It’s essential for absorbing shock during activities like walking, climbing stairs, and stepping off curbs
So, of course, strengthening this muscle supports knee health.
The exercise this video recommends for strengthening it involves leaning against a wall with feet about a foot away (closer feet make it easier, further makes it harder). Note, this is a lean, not a “Roman chair”.
The exercise involves squeezing the quadriceps, lifting toes toward the nose, and engaging the tibialis anterior muscle. If you’re wondering what to do with your hands, they can be held out with palms open to work on posture, or hanging by the sides. Do this for about 1½–2 minutes.
For more on all this, plus a visual demonstration, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
When Bad Joints Stop You From Exercising (5 Things To Change)
Take care!
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The Exercise That Protects Your Brain
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The Neuroscientist In The Gym
This is Dr. Wendy Suzuki. She’s a neuroscientist, and an expert in the neurobiology of memory, as well as neuroplasticity, and the role of exercise in neuroprotection.
We’ve sneakily semi-featured her before when we shared her Big Think talk:
Brain Benefits In Three Months… Through Walking?
Today we’re going to expand on that a little!
A Quick Recap
To share the absolute key points of that already fairly streamlined rundown:
- Exercise boosts levels of neurotransmitters such as dopamine and serotonin (and, which wasn’t mentioned there, noradrenaline)
- These are responsible for motivation, happiness, and focus (amongst other things)
- Persistent exercise boosts certain regions of the brain in particular, most notably the pre-frontal cortex and the hippocampi*
- These are responsible for planning and memory (amongst other things)
Dr. Suzuki advocates for stepping up your exercise routine if you can, with more exercise generally being better than less (unless you have some special medical reason why that’s not the case for you).
*often referred to in the singular as the hippocampus, but you have one on each side of your brain (unless a serious accident/incident destroyed one, but you’ll know if that applies to you, unless you lost both, in which case you will not remember about it).
What kind(s) of workout?
While a varied workout is best for overall health, for these brain benefits specifically, what’s most important is that it raises your heart rate.
This is why in her Big Think talk we shared before, she talks about the benefits of taking a brisk walk daily. See also:
If that’s not your thing, though (and/or is for whatever reason an inaccessible form of exercise for you), there is almost certainly some kind of High Intensity Interval Training that is a possibility for you. That might sound intimidating, but if you have a bit of floor and can exercise for one minute at a time, then HIIT is an option for you:
How To Do HIIT (Without Wrecking Your Body)
Dr. Suzuki herself is an ardent fan of “intenSati” which blends cardio workouts with yoga for holistic mind-and-body fitness. In fact, she loves it so much that she became a certified exercise instructor:
How much is enough?
It’s natural to want to know the minimum we can do to get results, but Dr. Suzuki would like us to bear in mind that when it comes to our time spent exercising, it’s not so much an expense of time as an investment in time:
❝Exercise is something that when you spend time on it, it will buy you time when you start to work❞
Read more: A Neuroscientist Experimented on Her Students and Found a Powerful Way to Improve Brain Function
Ok, but we really want to know how much!
Dr. Suzuki recommends at least three to four 30-minute exercise sessions per week.
Note: this adds up to less than the recommended 150 minutes of moderate exercise per week, but high-intensity exercise counts for twice the minutes for these purposes, e.g. 1 minute of high-intensity exercise is worth 2 minutes of moderate exercise.
How soon will we see benefits?
Benefits start immediately, but stack up cumulatively with continued long-term exercise:
❝My lab showed that a single workout can improve your ability to shift and focus attention, and that focus improvement will last for at least two hours. ❞
…which is a great start, but what’s more exciting is…
❝The more you’re working out, the bigger and stronger your hippocampus and prefrontal cortex gets. Why is that important?
Because the prefrontal cortex and the hippocampus are the two areas that are most susceptible to neurodegenerative diseases and normal cognitive decline in aging. ❞
In other words, while improving your heart rate through regular exercise will help prevent neurodegeneration by the usual mechanism of reducing neuroinflammation… It’ll also build the parts of your brain most susceptible to decline, meaning that when/if decline sets in, it’ll take a lot longer to get to a critical level of degradation, because it had more to start with.
Read more:
Inspir Modern Senior Living | Dr. Wendy Suzuki Boosts Brain Health with Exercise
Want more from Dr. Suzuki?
You might enjoy her TED talk:
Click Here If The Embedded Video Doesn’t Load Automatically
Prefer text? TED.com has a transcript for you
Prefer lots of text? You might like her book, which we haven’t reviewed yet but will soon:
Enjoy!
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- Exercise boosts levels of neurotransmitters such as dopamine and serotonin (and, which wasn’t mentioned there, noradrenaline)
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7 Steps to Get Off Sugar and Carbohydrates – by Susan Neal
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We will not keep the steps a mystery; abbreviated, they are:
- decide to really do this thing
- get knowledge and support
- clean out that pantry/fridge/etc and put those things behind you
- buy in healthy foods while starving your candida
- plan for an official start date, so that everything is ready
- change the way you eat (prep methods, timings, etc)
- keep on finding small ways to improve, without turning back
Particularly important amongst those are starving the candida (the fungus in your gut that is responsible for a lot of carb cravings, especially sugar and alcohol—which latter can be broken down easily into sugar), and changing the “how” of eating as well as the “what”; those are both things that are often overlooked in a lot of guides, but this one delivers well.
Walking the reader by the hand through things like that is probably the book’s greatest strength.
In the category of subjective criticism, the author does go off-piste a little at the end, to take a moment while she has our attention to talk about other things.
For example, you may not need “Appendix 7: How to Become A Christian and Disciple of Jesus Christ”.
Of course if that calls to you, then by all means, follow your heart, but it certainly isn’t a necessary step of quitting sugar. Nevertheless, the diversion doesn’t detract from the good dietary change advice that she has just spent a book delivering.
Bottom line: there’s no deep science here, but there’s a lot of very good, very practical advice, that’s consistent with good science.
Click here to check out 7 Steps to Get Off Sugar, and watch your health improve!
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Weight Vests Against Osteoporosis: Do They Really Build Bone?
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Dr. Doug Lucas is a dual board-certified physician specializing in optimizing healthspan and bone health for women experiencing osteoporosis, perimenopause, and menopause. Here, he talks weight vests:
Worth the weight?
Dr. Lucas cites “Wolf’s Law”—bones respond to stress. A weighted vest adds stress, to help build bone density. That said, they may not be suitable for everyone (for example, in cases of severe osteoporosis or a recent vertebral fracture).
He also cites some studies:
- Erlanger Fitness Study (2004): participants with a weighted vest maintained or improved bone density compared to a control group, but there was no group with exercise alone, making it unclear if the vest itself had the biggest impact.
- Newer studies (2016, 2017): showed improved outcomes for groups wearing a weighted vest, but again lacked an exercise-only group for comparison.
- 2012 study: included three groups (control, weighted vest, exercise only). Results showed no significant bone density difference between vest and exercise-only groups, though the vest group showed better balance and motor control.
Dr. Lucas concludes that weighted vests are a useful tool while nevertheless not being a magic bullet for bone health. In other words, they can complement exercise but you will also be fine without. If you do choose to level-up your exercise by using a weight vest, then starting with 5–10% of body weight in a vest is often recommended, but it depends on individual circumstances. If in doubt, start low and build up. Wearing the vest for daily activities can be effective, but improper use (awkward positions or improper impact training) can increase injury risk, so do be careful with that.
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:
- Osteoporosis & Exercises: Which To Do (And Which To Avoid)
- One More Resource Against Osteoporosis!
- The Osteoporosis Breakthrough – by Dr. Doug Lucas ← we reviewed his book a while back!
Take care!
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