There are ‘forever chemicals’ in our drinking water. Should standards change to protect our health?
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Today’s news coverage reports potentially unsafe levels of “forever chemicals” detected in drinking water supplies around Australia. These include human-made chemicals: perfluorooctane sulfonate (known as PFOS) and perflurooctanic acid (PFOA). They are classed under the broader category of per- and polyfluoroalkyl substances or PFAS chemicals.
The contaminants found in our drinking water are the same ones United States authorities warn can cause cancer over a long period of time, with reports warning there is “no safe level of exposure”.
In April, the US Environmental Protection Agency (USEPA) sent shock waves through the water industry around the world when it announced stricter advice on safe levels of PFOS/PFOA in drinking water. This reduced limits considered safe in supplies to zero and gave the water industry five years to meet legally enforceable limits of 4 parts per trillion.
So, should the same limits be enforced here in Australia? And how worried should we be that the drinking in many parts of Australia would fail the new US standards?
What are the health risks?
Medical knowledge about the human health effects of PFOS/PFOA is still emerging. An important factor is the bioaccumulation of these chemicals in different organs in the body over time.
Increased exposure of people to these chemicals has been associated with several adverse health effects. These include higher cholesterol, lower birth weights, modified immune responses, kidney and testicular cancer.
It has been very difficult to accurately track and measure effects of different levels of PFAS exposure on people. People may be exposed to PFAS chemicals in their everyday life through waterproofing of clothes, non-stick cookware coatings or through food and drinking water. PFAS can also be in pesticides, paints and cosmetics.
The International Agency for Research on Cancer (on behalf of the World Health Organization) regards PFOA as being carcinogenic to humans and PFOS as possibly carcinogenic to humans.
Our guidelines
Australian drinking water supplies are assessed against national water quality standards. These Australian Drinking Water Guidelines are continuously reviewed by industry and health experts that scan the international literature and update them accordingly.
All city and town water supplies across Australia are subject to a wide range of physical and chemical water tests. The results are compared to Australian water guidelines.
Some tests relate to human health considerations, such as levels of lead or bacteria. Others relate to “aesthetic” considerations, such as the appearance or taste of water. Most water authorities across Australia make water quality information and compliance with Australian guidelines freely available.
What about Australian PFOS and PFOA standards?
These chemicals can enter our drinking water system from many potential sources, such as via their use in fire-fighting foams or pesticides.
According to the Australian Drinking Water Guidelines, PFOS should not exceed 0.07 micrograms per litre in drinking water. And PFOA should not exceed 0.56 micrograms per litre. One microgram is equivalent to one part per billion.
The concentration of these chemicals in water is incredibly small. And much of the advice on their concentration is provided in different units. Sometimes in micrograms or nannograms. The USEPA uses parts per trillion.
In parts per trillion (ppt) the Australian Guidelines for PFOS is 70 ppt and PFOA is 560 ppt. The USEPA’s new maximum contaminant levels (enforceable levels) are 4 ppt for both PFOS and also PFOA. Previous news reports have pointed out Australian guidelines for these chemicals in drinking water are up to 140 times higher than the USEPA permits.
Yikes! That seems like a lot
Today’s news report cites PFOS and PFOA water tests done at many different water supplies across Australia. Some water samples did not detect either chemicals. But most did, with the highest PFOS concentration 15.1–15.6 parts per trillion from Glenunga, South Australia. The highest PFOA concentration was reported from a small water supply in western Sydney, where it was detected at 5.17–9.66 parts per trillion.
Australia and the US are not alone. This is an enormous global problem.
One of the obvious challenges for the Australian water industry is that current water treatment processes may not be effective at removing PFOS or PFOA. The Australian Drinking Water Guidelines provide this advice:
Standard water treatment technologies including coagulation followed by physical separation, aeration, chemical oxidation, UV irradiation, and disinfection have little or no effect on PFOS or PFOA concentrations.
Filtering with activated carbon and reverse osmosis may remove many PFAS chemicals. But no treatment systems appear to be completely effective at their removal.
Removing these contaminants might be particularly difficult for small regional water supplies already struggling to maintain their water infrastructure. The NSW Auditor General criticised the planning for, and funding of, town water infrastructure in regional NSW back in 2020.
Where to from here?
The Australian water industry likely has little choice but to follow the US lead and address PFOS/PFAS contamination in drinking water. Along with lower thresholds, the US committed US$1 billion to water infrastructure to improve detection and water treatment. They will also now require:
Public water systems must monitor for these PFAS and have three years to complete initial monitoring (by 2027) […]
As today’s report notes, it is very difficult to find any recent data on PFOS and PFOA in Australian drinking water supplies. Australian regulators should also require ongoing and widespread monitoring of our major city and regional water supplies for these “forever chemicals”.
The bottom line for drinking tap water is to keep watching this space. Buying bottled water might not be effective (2021 US research detected PFAS in 39 out of 100 bottled waters). The USEPA suggests people can reduce PFAS exposure with measures including avoiding fish from contaminated waters and considering home filtration systems.
Correction: this article previously listed the maximum Australian Drinking Water Guidelines PFOA level as 0.056 micrograms per litre. The figure has been updated to show the correct level of 0.56 micrograms per litre.
Ian A. Wright, Associate Professor in Environmental Science, Western Sydney University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Meditation That You’ll Actually Enjoy
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Meditation That You’ll Actually Enjoy
We previously wrote about…
No-Frills, Evidence-Based Mindfulness
this is a great primer, by the way, for the science and simplicity of mindfulness, along with the simplest mindfulness meditation to get you going.
Today, we’re going to have some fun with meditation.
First: The Problem
Once the usefulness and health benefits of meditation have been established, often people want to meditate, but complain they don’t have the time.
But that’s not the real reason, though, is it?
Let’s face it, a basic meditation can give benefits within two minutes. Or within two breaths, for that matter. So, it’s not really for a lack of time.
The real reason is because it doesn’t feel productive, and it’s not fun. For us to feel motivated to do a thing, usually we need at least one or the other. And even if we know it really is productive, it not feeling that way will hobble us.
So instead, let us make things a little more fun, with…
Meditation games!
As it turns out, there are good kinds of meditation with which one can have a little fun.
Catch the next thought
A common feature of many meditative practices is the experience of having fewer, or ideally no, thoughts.
But it’s hard to enact a negative, and thoughts keep coming.
So instead, make yourself comfortable, settle in, and lie in wait for thoughts. When one comes along, pounce on it in your mind. And then release it, and wait for the next.
At first, your thoughts may be coming thick and fast, but soon, you’ll find the pauses between them lengthening, and you have moments of contented not-knowing of what the next thought will be before it comes along.
This state of relaxed, ready alertness, calm and receptive, is exactly what we’re hoping to find here. But don’t worry about that while you’re busy lying in wait for the next wild thought to come along
Counting breaths
Many meditative practices involve focus on one’s breath. But it’s easy for attention to wander!
This game is a simple one. Count your breaths, not trying to change your rate of breathing at all, just letting it be, and see how high you can get before you lose count.
Breathing in and out, once, counts as one breath, by the way.
You may find that your rate of breathing naturally slows while you’re doing this. That’s fine; let it. It’ll add to the challenge of the game, because before long there will be lengthy pauses between each number.
If you lose count, just start again, and see if you can beat your high score.
This meditation game is an excellent exercise to build for sustained focus, while also improving the quality of breathing (as a side-effect of merely paying attention to it).
Hot spot, cold spot
The above two meditation games were drawn from Japanese and Chinese meditative practices, zen and qigong respectively; this one’s from an Indian meditative practice, yoga nidra. But for now, just approach it with a sense of playful curiosity, for best results.
Make yourself comfortable, lying on your back, arms by your sides.
Take a moment first to pay attention to each part of your body from head to toe, and release any tension that you may be holding along the way.
First part: mentally scan your body for where it feels warmest, or most active, or most wanting of attention (for example if there is pain, or an itch, or some other sensation); that’s your “hot spot” for the moment.
Second part: mentally scan your body for where it feels coolest, or most inert, or almost like it’s not a part of your body at all; that’s your “cold spot” for the moment.
Now, see if you can flip them. Whether you can or can’t, notice if your “hot spot” or “cold spot” moves, or if you can move them consciously.
This meditation game is a great exercise to strengthen interoception and somatic awareness in general—essential for being able to “listen to your body”!
Closing thoughts
All three practices above have very serious reasons and great benefits, but make sure you don’t skip enjoyment of the fun aspects!
Being “young at heart” is, in part, to do with the ability to enjoy—literally, to take joy in—the little things in life.
With that in mind, all we have left to say here is…
Enjoy!
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Top 10 Causes Of High Blood Pressure
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As Dr. Frita Fisher explains, these are actually the top 10 known causes of high blood pressure. Number zero on the list would be “primary hypertension”, which means high blood pressure with no clear underlying cause.
Superficially, this feels a little like the sometime practice of writing the catch-all “heart failure” as the cause of death on a death certificate, because yes, that heart sure did stop beating. But in reality, primary hypertension is most likely often caused by such things as unmanaged chronic stress—something that doesn’t show up on most health screenings.
Dr. Fisher’s Top 10
- Thyroid disease: both hyperthyroidism and hypothyroidism can cause high blood pressure.
- Obstructive sleep apnea: characterized by snoring, daytime sleepiness, and headaches, this condition can lead to hypertension.
- Chronic kidney disease: diseases ranging from diabetic nephropathy to renal vascular disease can cause high blood pressure.
- Elevated cortisol levels: conditions like Cushing’s syndrome or disease, which involve high cortisol levels, can lead to hypertension—as can a lifestyle with a lot of chronic stress, but that’s less readily diagnosed as such than something one can tell from a blood test.
- Elevated aldosterone levels: excess aldosterone from the adrenal glands causes the body to retain salt and water, increasing blood pressure, because more stuff = more pressure.
- Brain tumor: tumors that increase intracranial pressure can cause a rise in blood pressure to ensure adequate brain perfusion. In these cases, the hypertension is keeping you alive—unless it kills you first. If this seems like a strange bodily response, remember that our bodily response to an infection is often fever, to kill off the infection which can’t survive at such high temperatures (but neither can we, so it becomes a game of chicken with our life on the line), so sometimes our body does kill us with one thing while trying to save us from another.
- Coarctation of the aorta: this congenital heart defect results in narrowing of the aorta, leading to hypertension, especially in the upper body.
- Pregnancy: pregnancy can either induce or worsen existing hypertension.
- Obesity: excess weight increases blood flow and pressure on arteries, raising the risk of hypertension and associated conditions, e.g. diabetes etc.
- Drugs: certain medications and recreational drugs (including, counterintuitively, alcohol!) can elevate blood pressure.
For more information on each of these, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
Hypertension: Factors Far More Relevant Than Salt
Take care!
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Foods for Stronger Bones
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It’s Q&A Day!
Have a question or a request? You can always hit “reply” to any of our emails, or use the feedback widget at the bottom!
This newsletter has been growing a lot lately, and so have the questions/requests, and we love that! In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!
As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!
So, no question/request too big or small
Q: Foods that help build stronger bones and cut inflammation? Thank you!
We’ve got you…
For stronger bones / To cut inflammation
That “stronger bones” article is about the benefits of collagen supplementation for bones, but there’s definitely more to say on the topic of stronger bones, so we’ll do a main feature on it sometime soon!
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How Your Sleep Position Changes Dementia Risk
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This is not just about sleep duration or even about sleep quality… It really is about which way your body is positioned.
Goodnight, glymphatic system
The association between sleeping position and dementia risk is about glymphatic drainage, which is largely powered by gravity (and thus dependent on which way around your head and neck are oriented), and very important for clearing toxins out of the brain—including beta-amyloid proteins.
This becomes particularly important when the glymphatic system becomes less efficient in midlife, often 15–20 years before cognitive decline symptoms appear.
The video’s thumbnail headline, “SCIENTISTS REVEAL: THE WAY YOUR SLEEP CAN CAUSE DEMENTIA” is overstated and inaccurate, but our adjusted headline “how your sleep position changes dementia risk” is actually representative of the paper on which this video was based; we’ll quote from the paper itself here:
❝This paper concludes that 1. glymphatic clearance plays a major role in Alzheimer’s pathology; 2. the vast majority of waste clearance occurs during sleep; 3. dementias are associated with sleep disruption, alongside an age-related decline in AQP4 polarization; and 4. lifestyle choices such as sleep position, alcohol intake, exercise, omega-3 consumption, intermittent fasting and chronic stress all modulate* glymphatic clearance. Lifestyle choices could therefore alter Alzheimer’s disease risk through improved glymphatic clearance, and could be used as a preventative lifestyle intervention for both healthy brain ageing and Alzheimer’s disease.❞
…and specifically, they found:
❝Glymphatic transport is most efficient in the right lateral sleeping position, with more CSF clearance occurring compared to supine and prone. The average person changes sleeping position 11 times per night, but there was no difference in the number of position changes between neurodegenerative and control groups, making the percentage of time spent in supine position the risk factor, not the number of position changes❞
Read the paper in full here: The Sleeping Brain: Harnessing the Power of the Glymphatic System through Lifestyle Choices
*saying “modulate” here is not as useful as it could be, because they modulate it differently: side-sleeping improves clearance; back sleeping decreases it; front-sleeping isn’t great either. Alcohol intake reduces clearance, exercise (especially cardiovascular exercise) improves it; omega-3 consumption improves it up a degree and does depend on omega-3/6 ratios, intermittent fasting improves it, and chronic stress worsens it.
And for a more pop-science presentation, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
How To Clean Your Brain (Glymphatic Health Primer)
Take care!
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Can Ginkgo Tea Be Made Safe? (And Other Questions)
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It’s Q&A Day at 10almonds!
Have a question or a request? You can always hit “reply” to any of our emails, or use the feedback widget at the bottom!
In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!
As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!
So, no question/request too big or small
❝I’d be interested in OTC prostrate medication safety and effectiveness.❞
Great idea! Sounds like a topic for a main feature one day soon, but while you’re waiting, you might like this previous main feature we did, about a supplement that performs equally to some prescription BPH meds:
❝Was very interested in the article on ginko bilboa as i moved into a home that has the tree growing in the backyard. Is there any way i can process the leaves to make a tea out of it.❞
Glad you enjoyed! First, for any who missed it, here was the article on Ginkgo biloba:
Ginkgo Biloba, For Memory And, Uh, What Else Again?
Now, as that article noted, Ginkgo biloba seeds and leaves are poisonous. However, there are differences:
The seeds, raw or roasted, contain dangerous levels of a variety of toxins, though roasting takes away some toxins and other methods of processing (boiling etc) take away more. However, the general consensus on the seeds is “do not consume; it will poison your liver, poison your kidneys, and possibly give you cancer”:
Ginkgo biloba L. seed; A comprehensive review of bioactives, toxicants, and processing effects
The leaves, meanwhile, are much less poisonous with their ginkgolic acids, and their other relevant poison is very closely related to that of poison ivy, involving long-chain alkylphenols that can be broken down by thermolysis, in other words, heat:
However, this very thorough examination of the potential health benefits and risks of ginkgo tea, comes to the general conclusion “this is not a good idea, and is especially worrying in elders, and/or if taking various medications”:
In summary:
- Be careful
- Avoid completely if you have a stronger-than-usual reaction to poison ivy
- If you do make tea from it, green leaves appear to be safer than yellow ones
- If you do make tea from it, boil and stew to excess to minimize toxins
- If you do make tea from it, doing a poison test is sensible (i.e. start with checking for a skin reaction to a topical application on the inside of the wrist, then repeat at least 6 hours later on the lips, then at least 6 hours later do a mouth swill, then at least 12 hours later drink a small amount, etc, and gradually build up to “this is safe to consume”)
For safety (and legal) purposes, let us be absolutely clear that we are not advising you that it is safe to consume a known poisonous plant, and nor are we advising you to do so.
But the hopefully only-ever theoretical knowledge of how to do a poison test is a good life skill, just in case
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Fast Diet, Fast Exercise, Fast Improvements
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Diet & Exercise, Optimized
This is Dr. Michael Mosley. He originally trained in medicine with the intention of becoming a psychiatrist, but he grew disillusioned with psychiatry as it was practised, and ended up pivoting completely into being a health educator, in which field he won the British Medical Association’s Medical Journalist of the Year Award.
He also died under tragic circumstances very recently (he and his wife were vacationing in Greece, he went missing while out for a short walk on the 5th of June, appears to have got lost, and his body was found 100 yards from a restaurant on the 9th). All strength and comfort to his family; we offer our small tribute here today in his honor.
The “weekend warrior” of fasting
Dr. Mosley was an enjoyer (and proponent) of intermittent fasting, which we’ve written about before:
Fasting Without Crashing? We Sort The Science From The Hype
However, while most attention is generally given to the 16:8 method of intermittent fasting (fast for 16 hours, eat during an 8 hour window, repeat), Dr. Mosley preferred the 5:2 method (which generally means: eat at will for 5 days, then eat a reduced calorie diet for the other 2 days).
Specifically, he advocated putting that cap at 800 kcal for each of the weekend days (doesn’t have to be specifically the weekend).
He also tweaked the “eat at will for 5 days” part, to “eat as much as you like of a low-carb Mediterranean diet for 5 days”:
❝The “New 5:2” approach involves restricting calories to 800 on fasting days, then eating a healthy lower carb, Mediterranean-style diet for the rest of the week.
The beauty of intermittent fasting means that as your insulin sensitivity returns, you will feel fuller for longer on smaller portions. This is why, on non-fasting days, you do not have to count calories, just eat sensible portions. By maintaining a Mediterranean-style diet, you will consume all of the healthy fats, protein, fibre and fresh plant-based food that your body needs.❞
Read more: The Fast 800 | The New 5:2
And about that tweaked Mediterranean Diet? You might also want to check out:
Four Ways To Upgrade The Mediterranean Diet
Knowledge is power
Dr. Mosley encouraged the use of genotyping tests for personal health, not just to know about risk factors, but also to know about things such as, for example, whether you have the gene that makes you unable to gain significant improvements in aerobic fitness by following endurance training programs:
The Real Benefit Of Genetic Testing
On which note, he himself was not a fan of exercise, but recognised its importance, and instead sought to minimize the amount of exercise he needed to do, by practising High Intensity Interval Training. We reviewed a book of his (teamed up with a sports scientist) not long back; here it is:
Fast Exercise: The Simple Secret of High Intensity Training – by Dr. Michael Mosley & Peta Bee
You can also read our own article on the topic, here:
How To Do HIIT (Without Wrecking Your Body)
Just One Thing…
As well as his many educational TV shows, Dr. Mosley was also known for his radio show, “Just One Thing”, and a little while ago we reviewed his book, effectively a compilation of these:
Just One Thing: How Simple Changes Can Transform Your Life – by Dr. Michael Mosley
Enjoy!
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