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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The End of Old Age – by Dr. Marc Agronin
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First, what this book is not: a book about ending aging. For that, you would want to check out “Ending Aging”, by Dr. Aubrey de Grey.
What this book actually is: a book about the purpose of aging. As in: “aging: to what end?”, and then the book answers that question.
Rather than viewing aging as solely a source of decline, this book (while not shying away from that) resolutely examines the benefits of old age—from clinically defining wisdom, to exploring the many neurological trade-offs (e.g., “we lose this thing but we get this other thing in the process”), and the assorted ways in which changes in our brain change our role in society, without relegating us to uselessness—far from it!
The style of the book is deep and meaningful prose throughout. Notwithstanding the author’s academic credentials and professional background in geriatric psychiatry, there’s no hard science here, just comprehensible explanations of psychiatry built into discussions that are often quite philosophical in nature (indeed, the author additionally has a degree in psychology and philosophy, and it shows).
Bottom line: if you’d like your own aging to be something you understand better and can actively work with rather than just having it happen to you, then this is an excellent book for you.
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Walking can prevent low back pain, a new study shows
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Do you suffer from low back pain that recurs regularly? If you do, you’re not alone. Roughly 70% of people who recover from an episode of low back pain will experience a new episode in the following year.
The recurrent nature of low back pain is a major contributor to the enormous burden low back pain places on individuals and the health-care system.
In our new study, published today in The Lancet, we found that a program combining walking and education can effectively reduce the recurrence of low back pain.
PeopleImages.com – Yuri A/Shutterstock The WalkBack trial
We randomly assigned 701 adults who had recently recovered from an episode of low back pain to receive an individualised walking program and education (intervention), or to a no treatment group (control).
Participants in the intervention group were guided by physiotherapists across six sessions, over a six-month period. In the first, third and fifth sessions, the physiotherapist helped each participant to develop a personalised and progressive walking program that was realistic and tailored to their specific needs and preferences.
The remaining sessions were short check-ins (typically less than 15 minutes) to monitor progress and troubleshoot any potential barriers to engagement with the walking program. Due to the COVID pandemic, most participants received the entire intervention via telehealth, using video consultations and phone calls.
Low back pain can be debilitating. Karolina Kaboompics/Pexels The program was designed to be manageable, with a target of five walks per week of roughly 30 minutes daily by the end of the six-month program. Participants were also encouraged to continue walking independently after the program.
Importantly, the walking program was combined with education provided by the physiotherapists during the six sessions. This education aimed to give people a better understanding of pain, reduce fear associated with exercise and movement, and give people the confidence to self-manage any minor recurrences if they occurred.
People in the control group received no preventative treatment or education. This reflects what typically occurs after people recover from an episode of low back pain and are discharged from care.
What the results showed
We monitored the participants monthly from the time they were enrolled in the study, for up to three years, to collect information about any new recurrences of low back pain they may have experienced. We also asked participants to report on any costs related to their back pain, including time off work and the use of health-care services.
The intervention reduced the risk of a recurrence of low back pain that limited daily activity by 28%, while the recurrence of low back pain leading participants to seek care from a health professional decreased by 43%.
Participants who received the intervention had a longer average period before they had a recurrence, with a median of 208 days pain-free, compared to 112 days in the control group.
In our study, regular walking appeared to help with low back pain. PeopleImages.com – Yuri A/Shutterstock Overall, we also found this intervention to be cost-effective. The biggest savings came from less work absenteeism and less health service use (such as physiotherapy and massage) among the intervention group.
This trial, like all studies, had some limitations to consider. Although we tried to recruit a wide sample, we found that most participants were female, aged between 43 and 66, and were generally well educated. This may limit the extent to which we can generalise our findings.
Also, in this trial, we used physiotherapists who were up-skilled in health coaching. So we don’t know whether the intervention would achieve the same impact if it were to be delivered by other clinicians.
Walking has multiple benefits
We’ve all heard the saying that “prevention is better than a cure” – and it’s true. But this approach has been largely neglected when it comes to low back pain. Almost all previous studies have focused on treating episodes of pain, not preventing future back pain.
A limited number of small studies have shown that exercise and education can help prevent low back pain. However, most of these studies focused on exercises that are not accessible to everyone due to factors such as high cost, complexity, and the need for supervision from health-care or fitness professionals.
On the other hand, walking is a free, accessible way to exercise, including for people in rural and remote areas with limited access to health care.
Walking has a variety of advantages. Cast Of Thousands/Shutterstock Walking also delivers many other health benefits, including better heart health, improved mood and sleep quality, and reduced risk of several chronic diseases.
While walking is not everyone’s favourite form of exercise, the intervention was well-received by most people in our study. Participants reported that the additional general health benefits contributed to their ongoing motivation to continue the walking program independently.
Why is walking helpful for low back pain?
We don’t know exactly why walking is effective for preventing back pain, but possible reasons could include the combination of gentle movements, loading and strengthening of the spinal structures and muscles. It also could be related to relaxation and stress relief, and the release of “feel-good” endorphins, which block pain signals between your body and brain – essentially turning down the dial on pain.
It’s possible that other accessible and low-cost forms of exercise, such as swimming, may also be effective in preventing back pain, but surprisingly, no studies have investigated this.
Preventing low back pain is not easy. But these findings give us hope that we are getting closer to a solution, one step at a time.
Tash Pocovi, Postdoctoral research fellow, Department of Health Sciences, Macquarie University; Christine Lin, Professor, Institute for Musculoskeletal Health, University of Sydney; Mark Hancock, Professor of Physiotherapy, Macquarie University; Petra Graham, Associate Professor, School of Mathematical and Physical Sciences, Macquarie University, and Simon French, Professor of Musculoskeletal Disorders, Macquarie University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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7 Ways To Boost Mitochondrial Health To Fight Disease
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Fatigue and a general lack of energy can be symptoms of many things, and for most of them, looking after our mitochondrial health can at least help, if not outright fix the issue.
The Seven Ways
Dr. Jonas Kuene suggests that we…
- Enjoy a good diet: especially, limiting simple sugars, reducing overall carbohydrate intake, and swapping seed oils for healthier oils like avocado oil and olive oil.
- Take supplements: including coenzyme Q10, alpha-lipoic acid, and vitamins
- Decrease exposure to toxins: limit alcohol consumption (10almonds tip: limit it to zero if you can), avoid foods that are likely high in heavy metals or pesticides, and check you’re not being overmedicated (there can be a bit of a “meds creep” over time if left unchecked, so it’s good to periodically do a meds review in case something is no longer needed)
- Practice intermittent fasting: Dr. Kuene suggests a modest 16–18 hours fast per week; doing so daily is generally considered good advice, for those for whom this is a reasonable option
- Build muscle: exercise in general is good for mitochondria, but body composition itself counts for a lot too
- Sleep: aiming for 7–9 hours, and if that’s not possible at night, add a nap during the day to make up the lost time
- Get near-infrared radiation: from the sun, and/or made-for-purpose IR health devices.
For more info on these (including the referenced science), enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
- Coenzyme Q10 From Foods & Supplements
- How To Reduce Or Quit Alcohol
- Intermittent Fasting: What’s the truth?
- Build Muscle (Healthily!)
- Red Light, Go!
Take care!
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Unlock Your Menopause Type – by Dr. Heather Hirsch
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We featured Dr. Hirsch before, here, and mentioned this book which, at the time, we had not yet reviewed. So, here it is:
What sets this apart from a lot of menopause books is that there’s a lot less “eat these foods and your body will magically stop exhibiting symptoms of menopause” and a lot more clinical observations and then evidence-based recommendations.
Which is not to say don’t eat broccoli and almonds; by all means, they’re great foods and contain valuable nutrients that will help. But it is to say that if your doctor’s prescription is just broccoli and almonds, maybe have those as a snack while you’re looking for a second opinion.
Dr. Hirsch goes through various “menopause types”, but it’s not so much “astrology for gynecologists” and more “here are clusters of menopause symptoms set against timeline of presentation, and they can be categorized into six main ways that between them, cover pretty much all my patients, which have been many”.
So if you, dear reader, are menopausal (including peri- or post-), then the chances are very good that you will see yourself in one of those six sets.
She then goes about how to prioritize relief and safety, and personalize a treatment plan, and maintain the best menopausal care for you, going forward.
The style is easy-reading pop-science, punctuated by clinical science and 35 pages of references. She’s also, unlike a lot of authors in the genre, manifestly not invested in being a celebrity or making a personality cult out of her recommendations; she’s happy to stick to the science and put out good advice.
Bottom line: if you or someone you love is menopausal (including peri- or post-), this is a top-tier book.
Click here to check out Unlock Your Menopause Type, and get the best care for you!
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Food and Nutrition – by Dr. P.K. Newby
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The “What Everyone Needs To Know” part of the title is the name of a series of books, of which this one, “Food and Nutrition”, is one.
In this case, the title is apt, and/or could have been “What Everyone Really Should Know”, or “What Everyone Would Like To Think They Know But Have Often Just Been Bluffing Their Way Through The Supermarket Aisles”.
The chapter and section headings are all in the forms of questions, such that all-together in such volume in the table of contents, they’re reminiscent of the “Jonathan Frakes Asks You Things” meme.
But, this serves a dual purpose—for one, it makes the whole book one big FAQ, which is a very convenient format. Furthermore, it prompts a little thought on the part of the reader before each section, if we indeed question for ourselves:
- Are fertilizers in farming friend or foe?
- How have the Digital Revolution and Information Age impacted our diet?
- Are canned and frozen foods inferior to fresh?
- Does snacking or meal timing matter?
- What are cereal grains and “pseudograins”?
…And so many more. But what’s best about this is:
Dr. Newby doesn’t reference her own preferences, or even have a particular way of eating she’d like us to adopt. She just lays out the science to answer each question, as discovered by high-quality studies and a general weight of evidence.
Bottom line: this book can level-up your nutritional knowledge from bluffing to really knowing! A worthy addition to anyone’s bookshelf.
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The Keys to Good Mental Wellbeing
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The Nine Keys To Good Mental Wellbeing
Today’s main feature is a bit “pop psychology”, but it has its underpinnings in actual psychology, and is especially useful if approached from that angle.
What it’s most popularly enjoyed as:
- A personality-typing system.
- People love little quizzes and identifiers and such.
What it’s actually really useful as:
- A tool for understanding why people (including ourselves) are the way we are
- A foundational knowledge for living better ourselves, and helping others too
This stems from the fairly simple principle, uncontroversial in psychology:
- We have needs, desires, and aversions
- We act in a way that tries to get our needs met and avoid suffering
- Thus: Need/Fear → Motivation → Action
The Enneagram
The Enneagram (ἐννέα = “nine” in Ancient Greek) system posits that we each have one fundamental need/fear (from a list of nine) that’s strongest for us. A deep-seated insecurity/longing, that we’ll go to almost any lengths to try to meet. Sometimes, in good ways, sometimes, bad.
The Nine Basic Fears/Insecurities, And Their Corresponding Needs/Desires:
- Fear of being a fundamentally bad, wrong person / Need to be good and correct
- Fear of being fundamentally unloveable / Need to be loved
- Fear of being fundamentally worthless / Need to be valued
- Fear of being like everyone else / Need to be different
- Fear of being useless / Need to be useful
- Fear of being outcast / Need to have a set place in the group
- Fear of missing out / Need to experience things
- Fear of being hurt or controlled / Need to be in control
- Fear of conflict / Need to be at peace
Of course, most of us have most of these fears/needs to some extent, though usually one will stand out—especially if we aren’t managing it well. The less healthy our coping mechanisms, the more obvious it is how we’re trying to overcompensate in some fashion. For example:
- A person who fears being wrong and so becomes a perfectionist rules-abider to a fault
- A person who fears being unloveable, and so exaggerates problems to get pity, as the next best thing
- A person who fears being worthless, and so exaggerates their accomplishments in order to be admired and valued
- A person who fears being like everyone else, and so descends into a “nobody could ever possibly understand me” black hole of pathos.
- A person who fears being useless, so burns themself out trying to be an omnicompetent Leonardo da Vinci without ever actually taking the time to stop and smell the flowers as Leonardo did.
- A person who fears being outcast, so becomes clingy, passive-aggressive, and suspicious
- A person who fears missing out, so tries to experience all the things all the time, ruining their health with dizzying highs and crushing lows.
- A person who fears being hurt or controlled, so becomes aggressive and domineering
- A person who fears conflict, so shuts down at the slightest hint of it
If we have healthier coping mechanisms, these same nine people can look a lot different, but in much more subtle ways because we’re not trying to overcompensate so badly:
- A person who lives their life rationally by principles that can be adapted as they learn
- A person who loves and is loved, as perhaps the most notable part of their character
- A person who sets reasonable goals and accomplishes them, and seeks to uplift others
- A person who creates and innovates, enriching their own life and the lives of others
- A person who is simply very competent and knowledgeable, without overstretching
- A person who is dependable and loyal, and a reliable part of something bigger than themself
- A person who is fun to be around and loves trying new things, while also knowing how to relax
- A person who develops their leadership skills and is a tower of strength for others
- A person who knows how to make peace and does so—by themself, and with others
By being aware of our own fears/insecurities that may drive our motivations and thus underpin our behaviors, we can usually manage them in a much more mindful fashion. Same goes when it comes to managing interactions with other people, too:
- Letting the Type 3 know you value them, not their accomplishments or what they can do for you.
- Appreciating the Type 5’s (varied or specialist) skills and knowledge.
- Giving love to a Type 2 unprompted, but on your own terms, with your own boundaries.
- And so on for other types
Or for yourself…
- As a Type 8, remembering that you can let go sometimes and let someone else be in charge.
- As a Type 1, catching yourself holding yourself (or others) to impossible standards, and then easing up on that a little.
- As a Type 9, remembering to stand up for yourself and others, however gently, but firmly.
- And so on for other types
If you’re unsure what to focus on, ask yourself: what’s your worst nightmare or greatest daydream? Then work out what it is about that, that makes it feel so bad or good.
Then, approach things mindfully. Catch yourself in your unhealthy coping mechanisms, and find healthy ones instead.
What if I get my type wrong? Or I get someone else’s type wrong?
Obviously it’s better to get them right for maximum effect, but you can never go too far wrong anyway… because we all have all nine of those qualities in us, it’s just a matter of how strong a factor each is for us. So in the worst case scenario, you’ll make someone feel more secure about something that was only a very minor insecurity for them, for example.
Or in the case of your own type, you may mistakenly think you’re acing being the world’s healthiest Type 5, until you realize you’re actually a Type 3 who thought learning all those things would make you more worthy (spoiler: those things are great, but you’re worthy already). Again, not the end of the world! No matter what, you’re learning and growing, and that’s good.
Want to delve further?
Read: The Nine Enneagram Type Descriptions (Basic, but more detailed descriptions than the above)
Read: How The Enneagram System Works (More complex. Now we’re getting into the more arcane stuff we didn’t have time for today—wings and lines, triads, health levels, directions of integration and disintegration, and more)
Like learning from books? Here are our top two picks, depending on your learning style:
- The Wisdom of the Enneagram – Very comprehensive textbook and guide to improving your coping mechanism and growing as a person.
- The Enneagram Made Easy – it explains it with cartoons!
We’d love to offer a quick free test here, but all the tests we could find either require paid registration or are wildly inaccurate, so we’ll not waste your time.
However, we do also think that working it out for yourself is better, as it means you have a handle on what those ideas, fears, insecurities, desires, needs, really mean to you—that way you can actually use the information!
We’ll close by repeating our previous advice: If you’re unsure what to focus on, ask yourself: what’s your worst nightmare or greatest daydream? Then work out what it is about those scenarios that make them so bad or good. That’ll help you find your real fears/needs, such that you can work on them.
Good luck!
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