Is cold water bad for you? The facts behind 5 water myths
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We know the importance of staying hydrated, especially in hot weather. But even for something as simple as a drink of water, conflicting advice and urban myths abound.
Is cold water really bad for your health? What about hot water from the tap? And what is “raw water”? Let’s dive in and find out.
Myth 1: Cold water is bad for you
Some recent TikToks have suggested cold water causes health problems by somehow “contracting blood vessels” and “restricting digestion”. There is little evidence for this.
While a 2001 study found 51 out of 669 women tested (7.6%) got a headache after drinking cold water, most of them already suffered from migraines and the work hasn’t been repeated since.
Cold drinks were shown to cause discomfort in people with achalasia (a rare swallowing disorder) in 2012 but the study only had 12 participants.
For most people, the temperature you drink your water is down to personal preference and circumstances. Cold water after exercise in summer or hot water to relax in winter won’t make any difference to your overall health.
Myth 2: You shouldn’t drink hot tap water
This belief has a grain of scientific truth behind it. Hot water is generally a better solvent than cold water, so may dissolve metals and minerals from pipes better. Hot water is also often stored in tanks and may be heated and cooled many times. Bacteria and other disease-causing microorganisms tend to grow better in warm water and can build up over time.
It’s better to fill your cup from the cold tap and get hot water for drinks from the kettle.
Myth 3: Bottled water is better
While bottled water might be safer in certain parts of the world due to pollution of source water, there is no real advantage to drinking bottled water in Australia and similar countries.
According to University of Queensland researchers, bottled water is not safer than tap water. It may even be tap water. Most people can’t tell the difference either. Bottled water usually costs (substantially) more than turning on the tap and is worse for the environment.
What about lead in tap water? This problem hit the headlines after a public health emergency in Flint, Michigan, in the United States. But Flint used lead pipes with a corrosion inhibitor (in this case orthophosphate) to keep lead from dissolving. Then the city switched water sources to one without a corrosion inhibitor. Lead levels rose and a public emergency was declared.
Fortunately, lead pipes haven’t been used in Australia since the 1930s. While lead might be present in some old plumbing products, it is unlikely to cause problems.
Myth 4: Raw water is naturally healthier
Some people bypass bottled and tap water, going straight to the source.
The “raw water” trend emerged a few years ago, encouraging people to drink from rivers, streams and lakes. There is even a website to help you find a local source.
Supporters say our ancestors drank spring water, so we should, too. However, our ancestors also often died from dysentery and cholera and their life expectancy was low.
While it is true even highly treated drinking water can contain low levels of things like microplastics, unless you live somewhere very remote, the risks of drinking untreated water are far higher as it is more likely to contain pollutants from the surrounding area.
Myth 5: It’s OK to drink directly from hoses
Tempting as it may be, it’s probably best not to drink from the hose when watering the plants. Water might have sat in there, in the warm sun for weeks or more potentially leading to bacterial buildup.
Similarly, while drinking water fountains are generally perfectly safe to use, they can contain a variety of bacteria. It’s useful (though not essential) to run them for a few seconds before you start to drink so as to get fresh water through the system rather than what might have been sat there for a while.
We are fortunate to be able to take safe drinking water for granted. Billions of people around the world are not so lucky.
So whether you like it hot or cold, or somewhere in between, feel free to enjoy a glass of water this summer.
Just don’t drink it from the hose.
Oliver A.H. Jones, Professor of chemistry, RMIT University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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The 6 Pillars Of Nutritional Psychiatry
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Dr. Naidoo’s To-Dos
This is Dr. Uma Naidoo. She’s a Harvard-trained psychiatrist, professional chef graduating with her culinary school’s most coveted award, and a trained nutritionist. Between those three qualifications, she knows her stuff when it comes to the niche that is nutritional psychiatry.
She’s also the Director of Nutritional and Lifestyle Psychiatry at Massachusetts General Hospital (MGH) & Director of Nutritional Psychiatry at MGH Academy while serving on the faculty at Harvard Medical School.
What is nutritional psychiatry?
Nutritional psychiatry is the study of how food influences our mood (in the short term) and our more generalized mental health (in the longer term).
We recently reviewed a book of hers on this topic:
This Is Your Brain On Food – by Dr. Uma Naidoo
The “Six Pillars” of nutritional psychiatry
Per Dr. Naidoo, these are…
Be Whole; Eat Whole
Here Dr. Naidoo recommends an “80/20 rule”, and a focus on fiber, to keep the gut (“the second brain”) healthy.
See also: The Brain-Gut Highway: A Two-Way Street
Eat The Rainbow
This one’s simple enough and speaks for itself. Very many brain-nutrients happen to be pigments, and “eating the rainbow” (plants, not Skittles!) is a way to ensure getting a lot of different kinds of brain-healthy flavonoids and other phytonutrients.
The Greener, The Better
As Dr. Naidoo writes:
❝Greens contain folate, an important vitamin that maintains the function of our neurotransmitters. Its consumption has been associated with a decrease in depressive symptoms and improved cognition.❞
Tap into Your Body Intelligence
This is about mindful eating, interoception, and keeping track of how we feel 30–60 minutes after eating different foods.
Basically, the same advice here as from: The Kitchen Doctor
(do check that out, as there’s more there than we have room to repeat here today!)
Consistency & Balance Are Key
Honestly, this one’s less a separate item and is more a reiteration of the 80/20 rule discussed in the first pillar, and an emphasis on creating sustainable change rather than loading up on brain-healthy superfoods for half a weekend and then going back to one’s previous dietary habits.
Avoid Anxiety-Triggering Foods
This is about avoiding sugar/HFCS, ultra-processed foods, and industrial seed oils such as canola and similar.
As for what to go for instead, she has a broad-palette menu of ingredients she recommends using as a base for one’s meals (remember she’s a celebrated chef as well as a psychiatrist and nutritionist), which you can check out here:
Dr. Naidoo’s “Food for Mood” project
Enjoy!
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Super-Nutritious Shchi
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Today we have a recipe we’ve mentioned before, but now we have standalone recipe pages for recipes, so here we go. The dish of the day is shchi—which is Russian cabbage soup, which sounds terrible, and looks as bad as it sounds. But it tastes delicious, is an incredible comfort food, and is famous (in Russia, at least) for being something one can eat for many days in a row without getting sick of it.
It’s also got an amazing nutritional profile, with vitamins A, B, C, D, as well as lots of calcium, magnesium, and iron (amongst other minerals), and a healthy blend of carbohydrates, proteins, and fats, plus an array of anti-inflammatory phytochemicals, and of course, water.
You will need
- 1 large white cabbage, shredded
- 1 cup red lentils
- ½ lb tomatoes, cut into eighths (as in: halve them, halve the halves, and halve the quarters)
- ½ lb mushrooms sliced (or halved, if they are baby button mushrooms)
- 1 large onion, chopped finely
- 1 tbsp rosemary, chopped finely
- 1 tbsp thyme, chopped finely
- 1 tbsp black pepper, coarse ground
- 1 tsp cumin, ground
- 1 tsp yeast extract
- 1 tsp MSG, or 2 tsp low-sodium salt
- A little parsley for garnishing
- A little fat for cooking; this one’s a tricky and personal decision. Butter is traditional, but would make this recipe impossible to cook without going over the recommended limit for saturated fat. Avocado oil is healthy, relatively neutral in taste, and has a high smoke point for caramelizing the onions. Extra virgin olive oil is also a healthy choice, but not as neutral in flavor and does have a lower smoke point. Coconut oil has far too strong a taste and a low smoke point. Seed oils are very heart-unhealthy. All in all, avocado oil is a respectable choice from all angles except tradition.
Note: with regard to the seasonings, the above is a basic starting guide; feel free to add more per your preference—however, we do not recommend adding more cumin (it’ll overpower it) or more salt (there’s enough sodium in here already).
Method
(we suggest you read everything at least once before doing anything)
1) Cook the lentils until soft (a rice cooker is great for this, but a saucepan is fine); be generous with the water; we are making a soup, after all. Set them aside without draining.
2) Sauté the cabbage, and put it in a big stock pot or similar large pan (not yet on the heat)
3) Fry the mushrooms, and add them to the big pot (still not yet on the heat)
4) Use a stick blender to blend the lentils in the water you cooked them in, and then add to the big pot too.
5) Turn the heat on low, and if necessary, add more water to make it into a rich soup
6) Add the seasonings (rosemary, thyme, cumin, black pepper, yeast extract, MSG-or-salt) and stir well. Keep the temperature on low; you can just let it simmer now because the next step is going to take a while:
7) Caramelize the onion (keep an eye on the big pot, stirring occasionally) and set it aside
8) Fry the tomatoes quickly (we want them cooked, but just barely) and add them to the big pot
9) Serve! The caramelized onion is a garnish, so put a little on top of each bowl of shchi. Add a little parsley too.
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Level-Up Your Fiber Intake! (Without Difficulty Or Discomfort)
- The Magic Of Mushrooms: “The Longevity Vitamin” (That’s Not A Vitamin)
- Easily Digestible Vegetarian Protein Sources
- The Bare-Bones Truth About Osteoporosis
- Some Surprising Truths About Hunger And Satiety
Take care!
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Xylitol vs Erythritol – Which is Healthier?
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Our Verdict
When comparing xylitol to erythritol, we picked the xylitol.
Why?
They’re both sugar alcohols, which so far as the body is concerned are neither sugars nor alcohols in the way those words are commonly understood; it’s just a chemical term. The sugars aren’t processed as such by the body and are passed as dietary fiber, and nor is there any intoxicating effect as one might expect from an alcohol.
In terms of macronutrients, while technically they both have carbs, for all functional purposes they don’t and just have a little fiber.
In terms of micronutrients, they don’t have any.
The one thing that sets them apart is their respective safety profiles. Xylitol is prothrombotic and associated with major adverse cardiac events (CI=95, adjusted hazard ratio=1.57, range=1.12-2.21), while erythritol is also prothrombotic and more strongly associated with major adverse cardiac events (CI=95, adjusted hazard ratio=2.21, range=1.20-4.07).
So, xylitol is bad and erythritol is worse, which means the relatively “healthier” is xylitol. We don’t recommend either, though.
Studies for both:
- Xylitol is prothrombotic and associated with cardiovascular risk
- The artificial sweetener erythritol and cardiovascular event risk
Links for the specific products we compared, in case our assessment hasn’t put you off them:
Want to learn more?
You might like to read:
- The WHO’s New View On Sugar-Free Sweeteners ← the WHO’s advice is “don’t”
- Stevia vs Acesulfame Potassium – Which is Healthier? ← stevia’s pretty much the healthiest artificial sweetener around, though, if you’re going to use one
- The Fascinating Truth About Aspartame, Cancer, & Neurotoxicity ← under the cold light of science, aspartame isn’t actually as bad as it was painted a few decades ago, mostly by a viral hoax letter. Per the WHO’s advice, it’s still good to avoid sweeteners in general, however.
Take care!
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Unbroken – by Dr. MaryCatherine McDonald
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We’ve reviewed books about trauma before, so what makes this one different? Mostly, it’s the different framing.
Dr. McDonald advocates for a neurobiological understanding of trauma, which really levels the playing field when it comes to different types of trauma that are often treated very differently, when the end result in the brain is more or less the same.
Does this mean she proposes a “one-size fits all” approach? Kind of!
Insofar as she offers a one-size fits all approach that is then personalized by the user, but most of her advices will go for most kinds of trauma in any case. This is particularly useful for any of us who’ve ever hit a wall with therapists when they expect a person to only be carrying one major trauma.
Instead, with Dr. McDonald’s approach, we can take her methods and use them for each one.
After an introduction and overview, each chapter contains a different set of relevant psychological science explored through a case study, and then at the end of the chapter, tools to use and try out.
The style is very light and readable, notwithstanding the weighty subject matter.
Bottom line: if you’ve been trying to deal with (or avoid dealing with) some kind(s) of trauma, this book will doubtlessly contain at least a few new tools for you. It did for this reviewer, who reads a lot!
Click here to check out Unbroken, because it’s never too late to heal!
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Hello Sleep – by Dr. Jade Wu
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We’ve reviewed other sleep books before, so what makes this one stand out?
Mostly, it’s because this one takes quite a different approach.
While still giving a nod to the sensible advice you’ve already read in many places (including here at 10almonds), Dr. Wu looks to help the reader avoid falling into the trap (or: help the reader get out of the trap, if already there) of focussing so much on getting better sleep that it becomes an all-consuming stressor that takes up much of the day thinking about it, and guess what, much of the night too, because you’re busy working out how sleep-deprived you’re going to be tomorrow.
Instead, Dr. Wu recommends to work with your body rather than against it, worry less, and ultimately sleep better. Of course, the “how” of this is what makes most of the book.
She does also give chapters on things that may be different for you, based on such things as hormones, age, or medical conditions.
The writing style is pop-science but with frequent references to scientific papers as appropriate, making good science very accessible.
Bottom line: if you’ve tried everything else and/but good sleep still eludes you, this book will help you to end the battle and make friends with your sleep (a metaphor the author uses throughout the book, by the way).
Click here to check out Hello Sleep, and indeed get better sleep!
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Gravitas – by Caroline Goyder
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A no-nonsense guide to (more than!) public speaking that isn’t just “tell jokes in your speech and imagine the audience naked”.
Because this isn’t just about speech-writing or speech delivery, so much as giving you important life skills. The kind that weren’t taught in school, but that nevertheless make a huge impact on success… whether you’re giving a presentation or hosting a party or negotiating a deal or just attending a social event. Or making a phonecall, even.
Whereas a lot of books of this kind treat “the audience” as a nebulous and purely responsive passive crowd of extras, Goyder does better. People are individuals, even if they’re all facing the same way for a moment. She works with that! She also teaches how to deal with not just hecklers, but also simply those people who sap your confidence and find fault with you and anything you do or say.b
Bottom line is: if you for whatever reason communicate with people, and would like them to think better of you, this is the book for you.
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