Is thirst a good predictor of dehydration?
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Water is essential for daily functioning and health, and we can only survive a few days without it. Yet we constantly lose water through sweat, urination and even evaporation when we breathe.
This is why we have evolved a way to regulate and maintain water in our bodies. Like other animals, our survival relies on a strong biological drive that tells us to find and drink water to balance fluid loss.
This is thirst – a sensation of dryness in the mouth signalling we need to have a drink. This basic physiological mechanism is controlled mainly by part of the brain’s “control centre”, called the hypothalamus. The hypothalamus receives signals from various regions of the body and in return, releases hormones that act as a messenger to signal the thirst sensation.
What is dehydration?
Staying hydrated (having enough water in our bodies) is important for several reasons, including:
- regulating body temperature through sweat and respiration
- lubricating joints and eyes
- preventing infections
- digesting and absorbing nutrients
- flushing out waste (via the kidneys)
- preventing constipation
- brain function (including memory and concentration)
- mood and energy levels
- physical performance and recovery from exercise
- skin health.
Dehydration occurs when our body doesn’t have enough water. Even slight drops in fluid levels have noticeable consequences, such as headaches, feeling dizzy, lethargy and struggling to concentrate.
Chronic dehydration can pose more serious health risks, including urinary tract infections, constipation and kidney stones.
What does the evidence say?
Despite thirst being one of the most basic biological drivers for good hydration, science suggests our feelings of thirst and subsequent fluid intake don’t always correlate with hydration levels.
For example, a recent study explored the impact of thirst on fluid intake and hydration status. Participants attended a lab in the morning and then later in the afternoon to provide markers of hydration status (such as urine, blood samples and body weight). The relationship between levels of thirst in the morning and afternoon hydration status was negligible.
Further, thirst may be driven by environmental factors, such as access to water. For example, one study looked at whether ample access to water in a lab influenced how much people drank and how hydrated they were. The link between how thirsty they felt and how hydrated they were was weak, suggesting the availability of water influenced their fluid intake more than thirst.
Exercise can also change our thirst mechanism, though studies are limited at this stage.
Interestingly, research shows women experience thirst more strongly than men, regardless of hydration status. To understand gender differences in thirst, researchers infused men and women with fluids and then measured their thirst and how hydrated they were. They found women generally reported thirst at a lower level of fluid loss. Women have also been found to respond more to feeling thirsty by drinking more water.
Other ways to tell if you need to drink some water
While acknowledging some people will need to drink more or less, for many people, eight cups (or two litres) a day is a good amount of water to aim for.
But beyond thirst, there are many other ways to tell whether you might need to drink more water.
1. urine colour: pale yellow urine typically indicates good hydration, while darker, concentrated urine suggests dehydration
2. frequency of going to the toilet: urinating regularly (around four to six times a day) indicates good hydration. Infrequent urination can signal dehydration
3. skin turgor test: gently pinching the skin (for example, on the back of the hand) and observing how quickly the skin returns to its normal position can help assess hydration. Slow return may indicate dehydration
4. mouth and lips: a dry mouth or cracked lips can be early signs of dehydration
5. headaches and fatigue: frequent headaches, dizziness, or unexplained fatigue can be signs of inadequate hydration
6. sweating: in physically active people, monitoring how much they sweat during activity can help estimate fluid loss and hydration needs. Higher levels of sweat may predispose a person to dehydration if they are unable to replace the fluid lost through water intake
These indicators, used together, provide a more comprehensive picture of hydration without solely depending on the sensation of thirst.
Of course, if you do feel thirsty, it’s still a good idea to drink some water.
Lauren Ball, Professor of Community Health and Wellbeing, The University of Queensland and Kiara Too, PhD candidate, School of Human Movement and Nutrition Sciences, The University of Queensland
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Gut – by Dr. Giulia Enders
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On account of being an organ (or rather, a system of organs) whose functions are almost entirely autonomic, most of us don’t think about our gut much. We usually know there’s acid in the stomach, and we usually know there are “good and bad” gut bacteria. But what of the rest of what goes on?
For anyone who has a hazy half-remembered knowledge from school, this will serve as not only a reminder, but a distinct upgrade in knowledge.
Dr. Giuliua Enders talks us through not just the processes of what goes on, but, as a medical doctor, also many instances of what can go wrong, for example:
- Why do some people’s bodies mistake nuts for a deadly threat (and consequently, accidentally elevate them to the status of actually becoming a deadly threat)?
- Why are some people lactose-intolerant, and why do food intolerances often pop up later with age?
- Why do constipation and diarrhoea happen?
- Why is it that stress can cause stomach ulcers?
The style of writing is light and easy-reading, and the illustrations are clear too. This is a very accessible book that doesn’t assume prior knowledge, and also doesn’t skimp on the scientific explanations—there’s no dumbing down here.
Bottom line: knowing what goes on in our gut as akin to knowing what goes on under the hood of a car. A lot of the time we don’t need to know, but knowing can make a big difference from time to time, and that’s when you’ll wish you’d learned!
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Reading At Night: Good Or Bad For Sleep? 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
❝Would be interested in your views about “reading yourself to sleep”. I find that current affairs magazines and even modern novels do exactly the opposite. But Dickens – ones like David Copperfield and Great Expectations – I find wonderfully effective. It’s like entering a parallel universe where none of your own concerns matter. Any thoughts on the science that may explain this?!❞
Anecdotally: this writer is (like most writers) a prolific reader, and finds reading some fiction last thing at night is a good way to create a buffer between the affairs of the day and the dreams of night—but I could never fall asleep that way, unless I were truly sleep-deprived. The only danger is if I “one more chapter” my way deep into the night! For what it’s worth, bedtime reading for me means a Kindle self-backlit with low, soft lighting.
Scientifically: this hasn’t been a hugely researched area, but there are studies to work from. But there are two questions at hand (at least) here:
- one is about reading, and
- the other is about reading from electronic devices with or without blue light filters.
Here’s a study that didn’t ask the medium of the book, and concluded that reading a book in bed before going to sleep improved sleep quality, compared to not reading a book in bed:
Here’s a study that concluded that reading on an iPad (with no blue light filter) that found no difference in any metrics except EEG (so, there was no difference on time spent in different sleep states or sleep onset latency), but advised against it anyway because of the EEG readings (which showed slow wave activity being delayed by approximately 30 minutes, which is consistent with melatonin production mechanics):
Here’s another study that didn’t take EEG readings, and/but otherwise confirmed no differences being found:
We’re aware this goes against general “sleep hygiene” advice in two different ways:
- General advice is to avoid electronic devices before bedtime
- General advice is to not do activities besides sleep (and sex) in bed
…but, we’re committed to reporting the science as we find it!
Enjoy!
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Better Sex = Longer Life (Here’s How)
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This is Dr. Candice Hargons. She’s a professor of psychology, and has served on the Kentucky Psychological Association Board, the Society of Counseling Psychology Executive Board, and the American Psychological Association (APA)’s Council of Representatives. She also served on the APA Board of Directors, after receiving the APA’s Presidential Citation award for her research and leadership.
She leads the Study of Mental And Sexual Health Equity in Relationships (SMASHER Lab), with a predominant focus on promoting good sex, sexual wellness, and liberation among couples and communities.
In her own words:
❝Sex is one of the most common and normal human behaviors, and yet it remains relatively taboo as a topic. Many people worry about being judged, either for being perceived as too sexual or not sexual enough, and a major focus of my work is to normalize talking and learning about sex to improve sexual functioning across the adult lifespan.❞
~ Dr. Candice Hargons
So, let’s do that!
What does good sex do for health?
We’ve written previously about the health aspects of orgasms specifically:
“Early To Bed…” (Mythbusting Orgasms) ← including resources pertaining to anorgasmia, the inability to orgasm
…but orgasms are not the be-all-and-end-all of sex; see for example:
A Urologist Explains Edging: What, Why, & Is It Safe? ← when the journey is genuinely more of a focus than the destination
And certainly, good sex is simply a very good way to relax and de-stress, which is important, given how important stress management is to general health in very many ways (affecting things ranging from inflammation to heart health and more).
Plus, while the level of athleticism deployed may vary, sex is a physical activity, and physical activity is, as a rule, good.
There’s more to it than that though! It also can help us bind closely to our loved ones, in a positive way, which—critically—has a very positive impact on healthy longevity:
Only One Kind Of Relationship Promotes Longevity This Much! ← this is about the seriousness of the relationship, not the sex, but for most people, a strong and fulfilling relationship will include having good sex.
The scientific relationship between sex and longevity also got a whole chapter in this excellent book that we reviewed all so recently:
Age Proof: The New Science of Living a Longer and Healthier Life – by Dr. Rose Anne Kenny
What makes it “good”?
Dr. Hargons considers (and her opinion is backed by extensive research in the SMASHER Lab, if you’ll pardon the mental image that that might conjure) that first and foremost… It has to feel good to all parties involved.
In contrast, oftentimes, one partner’s pleasure is prioritized over another’s, and that becomes a problem.*
*assuming that’s not part of an established kink dynamic with enthusiastic affirmative consent, such as if the partner whose pleasure is being deprioritized is enthusiastically requesting to be denied orgasms, for example. Yes, that’s a real kink and even a popular one, but it’s not what’s happening in most sexually uneven relationships.
This kind of unplanned disparity often goes undiscussed by the couple in question—especially in heterosexual couples if the man is getting what he wants/needs and the woman isn’t, because there’s a rather lop-sided societal expectation in that regard. And even a loving, well-intentioned man can simply not know how to do better and be afraid to ask. And for that matter, it’s also entirely possible for his partner to not know either.
Dr. Hargons lists the four main keys as:
- Communication
- Intimacy
- Passion
- Pleasure
And communication indeed comes first, so to speak. For example, she advises:
❝Begin by identifying what you like and don’t like sexually. An easy way to do this is to create a “Yes, No, Maybe So” list. You can use paper or a Notes app on your phone.
Create three columns: one for Yes, No, and Maybe So sections. In the Yes section, write all the things you enjoy and want to keep doing sexually, as well as things you have not tried yet that you want to try. In the No section, write all the things you don’t enjoy and do not want to do anymore. It can also include things you haven’t tried that you’re uninterested in trying. Finally, in your Maybe So list, write all the things you’re curious about and/or are only willing to try in specific settings or circumstances.
You can share this list with your partner, but even if you are not ready to do that, you will already have enhanced your sexual self-awareness and be better positioned to talk with your sexual partner about what you want.❞
This represents an important shift from “whatever” to taking an active role in your sex life at your own pace.
And from there, it’s just a matter of exploring, together, and learning as you go. Could anything be more exciting than that?
“What if I’m single?”
We talked about this a little previously, more relationally than sexually specifically, though:
Now, a single person can of course still have an active sex life if you so choose, in which case, the above advice still applies, just, it’ll be conversations with your partner-of-the-moment rather than with a life partner. And that’s important too! Just because something is casual, doesn’t mean it need not be entered into mindfully and with a sense of what you want out of it, and communicating that effectively (while encouraging the same from others, and of course actually listening to, and caring about, what they say too).
And if you are, perchance, single and decided on a life of celibacy now, you can and (if you are sexual at all) should still figure out what you like and don’t like sexually, because even if it’s going to be you-on-you action, it will be good for you to love yourself enough to do it right.
Seriously, treat yourself at least as well as you would any other lover.
On which note, corded wand-style vibrators like the famous “Magic Wand” kind are much more powerful than the battery kind, and you will feel the difference, in a good way.
And if you really want to invest in your sexual wellness and you like the idea, saddle-style vibrators like this one will rock your socks off in ways handheld vibrators couldn’t dream of.
Want to know more?
You might want to check out Dr. Hargons’ book:
Good Sex: Stories, Science, and Strategies for Sexual Liberation – by Dr. Candice Hargons ← this covers so many important areas, more than we have room to here. Just check out the table of contents, and you’ll see what we mean.
…which we haven’t reviewed yet, but here are some excellent related books that we have:
- Come Together: The Science (and Art) of Creating Lasting Sexual Connections – by Dr. Emily Nagoski
- Better Sex Through Mindfulness: How Women Can Cultivate Desire – by Dr. Lori Brotto
Enjoy!
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The Menopause Manifesto – by Dr. Jen Gunter
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From the subtitle, you may wonder: with facts and feminism? Is this book about biology or sociology?
And the answer is: both. It’s about biology, principally, but without ignoring the context. We do indeed “live in a society”, and that affects everything from our healthcare options to what is expected of us as women.
So, as a warning: if you dislike science and/or feminism, you won’t like this book.
Dr. Jen Gunter, herself a gynaecologist, is here to arm us with science-based facts, to demystify an important part of life that is commonly glossed over.
She talks first about the what/why/when/how of menopause, and then delivers practical advice. She also talks about the many things we can (and can’t!) usefully do about symptoms we might not want, and how to look after our health overall in the context of menopause. We learn what natural remedies do or don’t work and/or can be actively harmful, and we learn the ins and outs of different hormone therapy options too.
Bottom line: no matter whether you are pre-, peri-, or post-menopausal, this is the no-BS guide you’ve been looking for. Same goes if you’re none of the above but spend any amount of time close to someone who is.
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Gut-Positive Pot Noodles
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Everything we consume either improves our health a little or worsens it. Pot noodles aren’t generally the healthiest foods, but these ones sure are! There’s quite a range of fiber in this, including the soluble fiber of the noodles themselves (which are, in fact, mostly fiber and water). As a bonus, the glucomannan in the noodles promotes feelings of fullness, notwithstanding its negligible carb count. Of course, the protein in the edamame beans also counts for satiety!
You will need
- ½ cup konjac noodles (also called shirataki), tossed in 1 tsp avocado oil (or sesame oil, if you don’t have avocado)
- 2 oz mangetout, thinly sliced
- 1 oz edamame beans
- ¼ carrot, grated
- 2 baby sweetcorn, cut in half lengthways
- 1 scallion, finely diced
- 1 heaped tsp crunchy peanut butter (omit if allergic)
- 1 tsp miso paste
- 1 tsp chili oil
- 1 tsp black pepper, coarse ground
- 1 tsp peeled-and-grated ginger
Method
(we suggest you read everything at least once before doing anything)
1) Layer a heat-resistant jar (mason jars are usually quite resistant to temperature changes) with the noodles and vegetables.
2) Combine the peanut butter, miso paste, and chili oil, black pepper, and ginger in a small bowl. Pour this dressing over the layered vegetables and noodles, and screw the lid on. Refrigerate until needed.
3) Add hot water to the jar and stir, to serve. If you prefer the vegetables to be more cooked, you can microwave (without the lid!) for a minute or two.
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Making Friends With Your Gut (You Can Thank Us Later)
- Why You’re Probably Not Getting Enough Fiber (And How To Fix It)
- 10 Ways To Balance Blood Sugars ← today’s recipe makes a perfect high-fiber, low-carb starter, per the hacks here
- Capsaicin For Weight Loss And Against Inflammation
- Black Pepper’s Impressive Anti-Cancer Arsenal (And More)
- Ginger Does A Lot More Than You Think
Take care!
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Healthy Kids, Happy Kids – by Dr. Elisa Song
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If you have young children or perhaps grandchildren, you probably care deeply about those children and their wellbeing, but there can often be a lot more guesswork than would be ideal, when it comes to ensuring they be and remain healthy.
Nevertheless, a lot of common treatments for children are based (whether parents know it or not—and often they dont) on what is most convenient for the parent, not necessarily what is best for the child. Dr. Song looks to correct that.
Rather than dosing kids with acetaminophen or even antibiotics, assuming eczema can be best fixed with a topical cream (treating the symptom rather than the cause, much?), and that some things like asthma “just are”, and “that’s unfortunate”, Dr. Song takes us on a tour of pediatric health, centered around the gut.
Why the gut? Well, it’s pretty central to us as adults, and it’s the same for kids, except one difference: their gut microbiome is changing even more quickly than ours (along with the rest of their body), and as such, is even more susceptible to little nudges for better or for worse, having a big impact in either direction. So, might as well make it a good one!
After an explanatory overview, most of the book is given over to recognizing and correcting what things can go wrong, including the top 25 acute childhood conditions, and the most critical chronic ones, and how to keep things on-track as a team (the child is part of the team! An important part!).
The style of the book is very direct and instructional; easy to understand throughout. It’s a lot like being in a room with a very competent pediatrician who knows her stuff and explains it well, thus neither patronizing nor mystifying.
Bottom line: if there are kids in your life, be they yours or your grandkids or someone else, this is a fine book for giving them the best foundational health.
Click here to check out Healthy Kids, Happy Kids, and take care of yours!
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