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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Celeriac vs Celery – Which is Healthier?
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Our Verdict
When comparing celeriac to celery, we picked the celeriac.
Why?
Yes, these are essentially the same plant, but there are important nutritional differences:
In terms of macros, celeriac has more than 2x the protein, and slightly more carbs and fiber. Both are very low glycemic index, so the higher protein and fiber makes celeriac the winner in this category.
In the category of vitamins, celeriac has more of vitamins B1, B3, B5, B6, C, E, K, and choline, while celery has more of vitamins A and B9. An easy win for celeriac.
When it comes to minerals, celeriac has more copper, calcium, iron, magnesium, manganese, phosphorus, potassium, selenium, and zinc, while celery is not higher in any minerals. Another obvious win for celeriac.
Adding these sections up makes for a clear overall win for celeriac, but by all means enjoy either or both!
Want to learn more?
You might like to read:
What’s Your Plant Diversity Score?
Take care!
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Reinventing Your Life – by Dr. Jeffrey Young & Dr. Janet Klosko
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This book is quite unlike any other broadly-CBT-focused books we’ve reviewed before. How so, you may wonder?
Rather than focusing on automatic negative thoughts and cognitive distortions with a small-lens focus on an immediate problem, this one zooms out rather and tackles the cause rather than the symptom.
The authors outline eleven “lifetraps” that we can get stuck in:
- Abandonment
- Mistrust & abuse
- Vulnerability
- Dependence
- Emptional deprivation
- Social exclusion
- Defectiveness
- Failure
- Subjugation
- Unrelenting standards
- Entitlement
They then borrow from other areas of psychology, to examine where these things came from, and how they can be addressed, such that we can escape from them.
The style of the book is very reader-friendly pop-psychology, with illustrative (and perhaps apocryphal, but no less useful for it if so) case studies.
The authors then go on to give step-by-step instructions for dealing with each of the 11 lifetraps, per 6 unmet needs we probably had that got us into them, and per 3 likely ways we tried to cope with this using maladaptive coping mechanisms that got us into the lifetrap(s) we ended up in.
Bottom line: if you feel there’s something in your life that’s difficult to escape from (we cannot outrun ourselves, after all, and bring our problems with us), this book could well contain the key that you need to get out of that cycle.
Click here to check out “Reinventing Your Life” and break free from any lifetrap(s) of your own!
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These Signs Often Mean These Nutrient Deficiencies (Do You Have Any?)
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These are not a necessary “if this then this” equation, but rather a “if this, then probably this”, and it’s a cue to try upping that thing in your diet, and if that doesn’t quickly fix it, get some tests done:
- White bumps on the skin: vitamin A, omega 3
- Craving sour foods: vitamin C
- Restless leg syndrome: iron, magnesium
- Cracked lips: vitamin B2
- Tingling hands and feet: vitamin B12
- Easy bruising: vitamin K and vitamin C
- Canker sores: vitamin B9 (folate), vitamin B12, iron
- Brittle or misshapen nails: vitamin B7 (biotin)
- Craving salty foods: sodium, potassium
- Prematurely gray hair: copper, vitamin B9 (folate), vitamin B12
- Dandruff: omega 3, zinc, vitamin B6
- Craving ice: iron
Dr. LeGrand Peterson has more to say about these though, as well as a visual guide to symptoms, so do check out the video:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to know more?
You might like this previous main feature about supplements vs nutrients from food
Do We Need Supplements, And Do They Work?
Enjoy!
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Exercised – by Dr. Daniel Lieberman
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Surely the title is taking liberties? We must have evolved to exercise, right? Not exactly.
We evolved to conserve energy. Our strength-to-weight ratio is generally unimpressive, we cannot casually hang in trees, and we spend a third of our lives asleep.
Strengths that we do have, however, include a large brain and a versatile gut perfect for opportunism. Again, not the indicators of being evolved for exercise.
So, Dr. Lieberman tells us, if we’re not inclined to get up and go, that’s quite natural. So, why does it feel good when we do get up and go?
This book covers a lot of the “this not that” aspects of exercise. By this we mean: ways that we can work with or against our bodies, for both physical and psychological fulfilment.
There’s an emphasis on such things as:
- movement without excessive exertion
- persistence being more important than power
- strength-building but only so far as is helpful to us
…and many other factors that you won’t generally see on your gym’s motivational posters
Bottom line: this book is for all those who have felt “exercise is not for me” but would also like the benefits of exercise. It turns out that there’s a best-of-both-worlds sweet spot!
Click here to check out Exercised and get working with your body rather than against it!
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The Twenty-Four Hour Mind – by Dr. Rosalind Cartwright
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We’ve reviewed books about sleep before, and even about dreaming, so what does this one have to offer that’s new?
Quite a lot, actually! Before Dr. Cartwright, there were mainly two models of sleep and dreaming:
- The “top-down” model of psychoanalysts: our minds shape our dreams which in turn reveal things about us as people
- The “bottom-up” model of neuroscientists: our brains need to go through regular maintaince cycles, of which vivid hallucinations are a quirky side-effect.
And now, as Dr. Cartwright puts it:
❝I will lay out a new [horizontal] psychological model of the twenty-four hour mind; that is, how the predominantly conscious (waking) and unconscious (sleeping) forms of mental behavior interact through the brain’s regular, but differently organized, states of waking, sleeping, and dreaming.❞
This she does in the exploratory style of a 224-page lecture, which sounds like it might be tedious, but is actually attention-grabbing and engaging throughout. This book is more of a page-turner than soporific bedtime reading!
Bottom line: if you’d like to know more about the effect your waking and sleeping brain have on each other (to include getting in between those and making adjutments as appropriate), this is very much an elucidating read!
Click here to check out The Twenty-Four Hour Mind, and learn more about yours!
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Spermidine For Longevity
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It’s Q&A Day at 10almonds!
Have a question or a request? We love to hear from you!
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 😎
❝How much evidence is there behind the longevity-related benefit related to spermidine, and more specifically, does it cause autophagy?❞
A short and simple answer to the latter question: yes, it does:
Spermidine: a physiological autophagy inducer acting as an anti-aging vitamin in humans?
For anyone wondering what autophagy is: it’s when old cells are broken down and consumed by the body to make new ones. Doing this earlier rather than later means that the genetic material is not yet so degraded when it is copied, and so the resultant new cell(s) will be “younger” than if the previous cell(s) had been broken down and recycled when older.
Indeed, we have written previously about senolytic supplements such as fisetin, which specialize in killing senescent (aging) cells earlier:
Fisetin: The Anti-Aging Assassin
As for spermidine and longevity, because of its autophagy-inducing properties, it’s considered a caloric restriction mimetic, that is to say, it has the same effect on a cellular level as caloric restriction. And yes, while it’s not an approach we regularly recommend here (usually preferring intermittent fasting as a CR-mimetic), caloric restriction is a way to fight aging:
Is Cutting Calories The Key To Healthy Long Life?
As for how spermidine achieves similarly:
Spermidine delays aging in humans
However! Both of the scientific papers on spermidine use in humans that we’ve cited so far today have conflict of interests statements made with regard to the funding of the studies, which means there could be some publication bias.
To that end, let’s look at a less glamorous study (e.g. no “in humans” in the title because, like most longevity studies, it’s with non-human animals with naturally short lifespans such as mice and rats), like this one that finds it to be both cardioprotective and neuroprotective and having many anti-aging benefits mediated by inducing autophagy:
A review on polyamines as promising next-generation neuroprotective and anti-aging therapy
(the polyamines in question are spermidine and putrescine, which latter is a similar polyamine)
Lastly, let’s answer a few likely related questions, so that you don’t have to Google them:
Does spermidine come from sperm?
Amongst other places (including some foods, which we’ll come to in a moment), yes, spermidine is normally found in semen (in fact, it’s partly responsible for the normal smell, though other factors influence the overall scent, such as diet, hormones, and other lifestyle factors such as smoking, alcohol use etc) and that is how/where it was first identified.
Does that mean that consuming semen is good for longevity?
Aside from the health benefits of a healthy sex life… No, not really. Semen does contain spermidine (as discussed) as well as some important minerals, but you’d need to consume approximately 1 cup of semen to get the equivalent spermidine you’d get from 1 tbsp of edamame (young soy) beans.
Unless your lifestyle is rather more exciting than this writer’s, it’s a lot easier to get 1 tbsp of edamame beans than 1 cup of semen.
Here are how some top foods stack up, by the way—we admittedly cherry-picked from the near top of the list, but wheatgerm is an even better source, with cheddar cheese and mushrooms (it was shiitake in the study) coming after soy:
Frontiers in Nutrition | Polyamines in Food
Alternatively, if you prefer to just take it in supplement form, here’s an example product on Amazon, giving 5mg per capsule (which is almost as much as the 1 cup of semen or 1 tbsp of edamame that we mentioned earlier).
Enjoy!
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