Carbonated Water: For Weight Loss, Satiety, Or Just Gas?
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There are two main mechanisms of action by which sparkling water is considered to help satiety and/or weight loss; they are:
- It “fills us up” such that we feel fuller sooner, and thus eat less, and thus (all other things being equal) perhaps lose weight
- The carbon dioxide is absorbed into the bloodstream, where (as a matter of chemistry) it improves glucose metabolism, thus lowering blood sugars and indirectly leading (potentially) to weight loss, but even if not, lowered blood sugars are good for most people most of the time, right?
However, there are just a few problems:
Full of gas?
Many people self-report enjoying sparkling water as a way to feel fuller while fasting (or even while eating). However, the plural of “anecdote” is not “data”, so, here be data… Ish:
❝In order to determine whether such satiating effects occur through oral carbonic stimulation alone, we conducted modified sham-feeding (SF) tests (carbonated water ingestion (CW), water ingestion (W), carbonated water sham-feeding (CW-SF), and water sham-feeding (W-SF)), employing an equivalent volume and standardized temperature of carbonated and plain water, in a randomized crossover design.
Thirteen young women began fasting at 10 p.m. on the previous night and were loaded with each sample (15ºC, 250 mL) at 9 a.m. on separate days. Electrogastrography (EGG) recordings were obtained from 20 min before to 45 min after the loading to determine the power and frequency of the gastric myoelectrical activity. Appetite was assessed using visual analog scales. After ingestion, significantly increased fullness and decreased hunger ratings were observed in the CW group. After the load, transiently but significantly increased fullness as well as decreased hunger ratings were observed in the CW-SF group. The powers of normogastria (2-4 cpm) and tachygastria (4-9 cpm) showed significant increases in the CW and W groups, but not in the CW-SF and W-SF groups. The peak frequency of normogastria tended to shift toward a higher band in the CW group, whereas it shifted toward a lower band in the CW-SF group, indicating a different EGG rhythm.
Our results suggest that CO2-induced oral stimulation is solely responsible for the feeling of satiety.❞
~ Dr. Maki Suzuki et al.
Now, that’s self-reported, and a sample size of 13, so it’s not the most airtight science ever, but it is at least science. Here’s the paper, by the way:
Oral Carbonation Attenuates Feeling of Hunger and Gastric Myoelectrical Activity in Young Women
Here’s another small study with 8 people, which found that still and sparkling water had the exact same effect:
Effect of carbonated water on gastric emptying and intragastric meal distribution
However, drinking water (still or sparkling) with a meal will not have anywhere near the same effect for satiety as consuming food that has a high water-content.
See also: Some Surprising Truths About Hunger And Satiety ← our main feature in which we examine the science of volumetrics, including a study that shows how water incorporated into a food (but not served with a food) decreases caloric intake.
As an aside, one difference that carbonation can make is to increase ghrelin levels—that’s the hunger hormone (the satiety hormone is leptin, by the way). This one’s a rat study, but it seems reasonable that the same will be true of humans:
…which is worth bearing in mind even if you yourself are not, in fact, a male rat.
The glucose guzzler?
This one has simply been the case of a study being misrepresented, for example here:
Fizzy water might aid weight loss by providing a small boost to glucose uptake and metabolism
The idea is that higher levels of carbon dioxide in the blood mean faster glucose metabolism, which is technically true. Now, often “technically true” is the best kind of true, but not here, because it’s simply not useful.
In short, we produce so much carbon dioxide as part of our normal respiratory processes, that any carbon dioxide we might consume in a carbonated water is barely a blip in the graph.
Oh, and that article we just linked? Even within the article, despite running with that headline, the actual scientists quoted are saying such things as:
❝While there is a hypothetical link between carbonated water and glucose metabolism, this has yet to be tested in well-designed human intervention studies❞
~ Professor Sumantra Ray
Note: the word “hypothetical” means “one level lower than theoretical”. This is very far from being a conclusion.
And the study itself? Wasn’t even about carbonated water, it was about kidney dialysis and how the carbon dioxide content can result in hypoglycemia:
The mechanism of hypoglycemia caused by hemodialysis
…which got referenced in this paper (not a study):
Can carbonated water support weight loss?
…and even that concluded:
❝CO2 in carbonated water may promote weight loss by enhancing glucose uptake and metabolism in red blood cells.
However, the amount is so small that it is difficult to expect weight loss effects solely from the CO2 in carbonated water.
Drinking carbonated water may also affect blood glucose measurements.❞
Note: the word “may”, when used by a scientist and in the absence of any stronger claims, means “we haven’t ruled out the possibility”.
What breaking news that is.
Stop the press! No, really, stop it!
So… What does work?
There are various ways of going about actually hacking hunger (and they stack; i.e. you can use multiple methods and get cumulative results), and we wrote about them here:
Enjoy!
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Live Life in Crescendo – by Stephen Covey and Cynthia Covey-Haller
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Stephen Covey is of course best known for his “7 Habits of Highly Effective People“, while the dozen books he wrote afterwards, not including this one, did not get the same acclaim.
Not including this one, because this one was published posthumously and, notwithstanding the order of the names on the cover, in all likelihood his daughter wrote most of.
And yet! The very spirit of this book is in defiance of 7 Habits being his “early career” magnum opus. We say “early career”, because he was 57 already when that was published, but it was one of his earlier books.
In this work the authors lay out the case for how “your most important work is always ahead of you“, and that it is perfectly possible to “live life in crescendo“, and keep on giving whatever it is that we want to give to the world.
We also learn, mostly through storytelling, of how people are infinitely more important than things, and that it is there that we should put our investments. And that while adversity may not make us stronger, it just means we may need to change our approach, to continue to be productive in whatever way is meaningful to us.
Bottom line: if ever you wonder how your future could live up to your past (in a good way), this is the book to get you thinking.
Click here to check out Live Life in Crescendo, and figure out what your next great work will be!
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Watermelon vs Cucumber – Which is Healthier?
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Our Verdict
When comparing watermelon to cucumber, we picked the cucumber.
Why?
Both are good! But in the battle of the “this is mostly water” salad items, cucumber wins out.
In terms of macros they both are, as we say, mostly water. However, watermelon contains more sugar for the same amount of fiber, contributing to cucumber having the lower glycemic index.
When it comes to vitamins, watermelon does a little better; watermelon has more of vitamins A, B1, B3, B6, C, and E, while cucumber has more of vitamins B2, B5, B9, K, and choline. So, a modest 6:5 win for watermelon.
In the category of minerals, it’s a different story; watermelon has more selenium, while cucumber has more calcium, iron, magnesium, manganese, phosphorus, potassium, and zinc.
Both contain an array of polyphenols; mostly different ones from each other.
As ever, enjoy both. However, adding up the sections, we say cucumber enjoys a marginal win here.
Want to learn more?
You might like to read:
Take care!
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The 7 Approaches To Pain Management
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More Than One Way To Kill Pain
This is Dr. Deepak Ravindran (MD, FRCA. FFPMRCA, EDRA. FIPP, DMSMed). He has decades of experience and is a specialist in acute and chronic pain management, anesthesia, musculoskeletal medicine, and lifestyle medicine.
A quick catch-up, first:
We’ve written about chronic pain management before:
Managing Chronic Pain (Realistically!)
As well as:
Science-Based Alternative Pain Relief
Dr. Ravindran’s approach
Dr. Ravindran takes a “trauma-informed care” approach to his professional practice, and recommends the same for others.
In a nutshell, this means starting from a position of not “what’s wrong with you?”, but rather “what happened to you?”.
This seemingly subtle shift is important, because it means actually dealing with a person’s issues, instead of “take one of these and call my secretary next month”. Read more:
Pain itself can be something of a many-headed hydra. Dr. Ravindran’s approach is equally many-headed; specifically, he has a 7-point plan:
Medications
Dr. Ravindran sees painkillers (and a collection of other drugs, like antidepressants and muscle relaxants) as a potential means to an end worth exploring, but he doesn’t expect them to be the best choice for everyone, and nor does he expect them to be a cure-all. Neither should we. He also advises being mindful of the drawbacks and potential complications of these drugs, too.
Interventions
Sometimes, surgery is the right choice. Sometimes it isn’t. Often, it will change a life—one way or the other. Similar to with medications, Dr. Ravindran is very averse to a “one size fits all” approach here. See also:
The Insider’s Guide To Making Hospital As Comfortable As Possible
Neuroscience and stress management
Often a lot of the distress of pain is not just the pain itself, but the fear associated with it. Will it get worse if I move wrong or eat the wrong thing? How long will it last? Will it ever get better? Will it get worse if I do nothing?. Dr. Ravindran advises tackling this, with the same level of importance as the pain itself. Here’s a good start:
Stress, And Building Psychological Resilience
Diet and the microbiome
Many chronic illnesses are heavily influenced by this, and Dr. Ravindran’s respect for lifestyle medicine comes into play here. While diet might not fix all our ills, it certainly can stop things from being a lot worse. Beyond the obvious “eat healthily” (Mediterranean diet being a good starting point for most people), he also advises doing elimination tests where appropriate, to screen out potential flare-up triggers. You also might consider:
Four Ways To Upgrade The Mediterranean Diet
Sleep
“Get good sleep” is easy advice for those who are not in agonizing pain that sometimes gets worse from staying in the same position for too long. Nevertheless, it is important, and foundational to good health. So it’s important to explore—whatever limitations one might realistically have—what can be done to improve it.
If you can only sleep for a short while at a time, you may get benefit from this previous main feature of ours:
How To Nap Like A Pro (No More “Sleep Hangovers”!)
Exercise and movement
The trick here is to move little and often; without overdoing it, but without permitting loss of mobility either. See also:
The Doctor Who Wants Us To Exercise Less, And Move More
Therapies of the mind and body
This is about taking a holistic approach to one’s wellness. In Dr. Ravindran’s words:
❝Mind-body therapies are often an extremely sensitive topic about which people hold very strong opinions and sometimes irrational beliefs.
Some, like reiki and spiritual therapy and homeopathy, have hardly any scientific evidence to back them up, while others like yoga, hypnosis, and meditation/mindfulness are mainstream techniques with many studies showing the benefits, but they all work for certain patients.❞
In other words: evidence-based is surely the best starting point, but if you feel inclined to try something else and it works for you, then it works for you. And that’s a win.
Want to know more?
You might like his book…
The Pain-Free Mindset: 7 Steps to Taking Control and Overcoming Chronic Pain
He also has a blog and a podcast.
Take care!
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Move – by Caroline Williams
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- Get 150 minutes of moderate exercise per week, says the American Heart Association
- There are over 10,000 minutes per week, says the pocket calculator
Is 150/10,000 really the goal here? Really?
For Caroline Williams, the answer is no.
In this book that’s practically a manifesto, she outlines the case that:
- Humans evolved to move
- Industrialization and capitalism scuppered that
- We now spend far too long each day without movement
Furthermore, for Williams this isn’t just an anthropological observation, it’s a problem to be solved, because:
- Our lack of movement is crippling us—literally
- Our stagnation affects not just our bodies, but also our minds
- (again literally—there’s a direct correlation with mental health)
- We urgently need to fix this
So, what now, do we need to move in to the gym and become full-time athletes to clock up enough hours of movement? No.
Williams convincingly argues the case (using data from supercentenarian “blue zones” around the world) that even non-exertive movement is sufficient. In other words, you don’t have to be running; walking is great. You don’t have to be lifting weights; doing the housework or gardening will suffice.
From that foundational axiom, she calls on us to find ways to build our life around movement… rather than production-efficiency and/or convenience. She gives plenty of tips for such too!
Bottom line: some books are “I couldn’t put it down!” books. This one’s more of a “I got the urge to get up and get moving!” book.
Get your get-up-and-go up and going with “Move”—order yours from Amazon today!
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What Most People Don’t Know About HIV
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What To Know About HIV This World AIDS Day
Yesterday, we asked 10almonds readers to engage in a hypothetical thought experiment with us, and putting aside for a moment any reason you might feel the scenario wouldn’t apply for you, asked:
❝You have unprotected sex with someone who, afterwards, conversationally mentions their HIV+ status. Do you…❞
…and got the above-depicted, below-described, set of responses. Of those who responded…
- Just over 60% said “rush to hospital; maybe a treatment is available”
- Just under 20% said “ask them what meds they’re taking (and perhaps whether they’d like a snack)”
- Just over 10% said “despair; life is over”
- Two people said “do the most rigorous washing down there you’ve ever done in your life”
So, what does science say about it?
First, a quick note on terms
- HIV is the Human Immunodeficiency Virus. It does what it says on the tin; it gives humans immunodeficiency. Like many viruses that have become epidemic in humans, it started off in animals (called SIV, because there was no “H” involved yet), which were then eaten by humans, passing the virus to us when it one day mutated to allow that.
- It’s technically two viruses, but that’s beyond the scope of today’s article; for our purposes they are the same. HIV-1 is more virulent and infectious than HIV-2, and is the kind more commonly found in most of the world.
- AIDS is Acquired Immunodeficiency Syndrome, and again, is what it sounds like. When a person is infected with HIV, then without treatment, they will often develop AIDS.
- Technically AIDS itself doesn’t kill people; it just renders people near-defenseless to opportunistic infections (and immune-related diseases such as cancer), since one no longer has a properly working immune system. Common causes of death in AIDS patients include cancer, influenza, pneumonia, and tuberculosis.
People who contract HIV will usually develop AIDS if untreated. Untreated life expectancy is about 11 years.
HIV/AIDS are only a problem for gay people: True or False?
False, unequivocally. Anyone can get HIV and develop AIDS.
The reason it’s more associated with gay men, aside from homophobia, is that since penetrative sex is more likely to pass it on, then if we go with the statistically most likely arrangements here:
- If a man penetrates a woman and passes on HIV, that woman will probably not go on to penetrate someone else
- If a man penetrates a man and passes on HIV, that man could go on to penetrate someone else—and so on
- This means that without any difference in safety practices or promiscuity, it’s going to spread more between men on average, by simple mathematics.
- This is why “men who have sex with men” is the generally-designated higher-risk category.
There is medication to cure HIV/AIDS: True or False?
False so far (though there have been individual case studies of gene treatments that may have cured people—time will tell).
But! There are medications that can prevent HIV from being a life-threatening problem:
- PrEP (Pre-Exposure Prophylaxis) is a medication that one can take in advance of potential exposure to HIV, to guard against it.
- This is a common choice for people aren’t sure about their partners’ statuses, or people working in risky environments.
- PEP (Post-Exposure Prophylaxis) is a medication that one can take after potential exposure to HIV, to “nip it in the bud”.
- Those of you who were rushing to hospital in our poll, this is what you’re rushing there for.
- ARVs (Anti-RetroVirals) are a class of medications (there are different options; we don’t have room to distinguish them) that reduce an HIV+ person’s viral load to undetectable levels.
- Those of you who were asking what meds your partner was taking, these will be those meds. Also, most of them are to be taken in the morning with food, so that’s what the snack was for.
If someone is HIV+, the risk of transmission in unprotected sex is high: True or False?
True or False, with false being the far more likely. It depends on their medications, and this is why you were asking. If someone is on ARVs and their viral load is undetectable (as is usual once someone has been on ARVs for 6 months), they cannot transmit HIV to you.
U=U is not a fancy new emoticon, it means “undetectable = untransmittable”, which is a mathematically true statement in the case of HIV viral loads.
See: NIH | HIV Undetectable=Untransmittable (U=U)
If you’re thinking “still sounds risky to me”, then consider this:
You are safer having unprotected sex with someone who is HIV+ and on ARVs with an undetectable viral load, than you are with someone you are merely assuming is HIV- (perhaps you assume it because “surely this polite blushing young virgin of a straight man won’t give me cooties” etc)
Note that even your monogamous partner of many decades could accidentally contract HIV due to blood contamination in a hospital or an accident at work etc, so it’s good practice to also get tested after things that involve getting stabbed with needles, cut in a risky environment, etc.
If you’re concerned about potential stigma associated with HIV testing, you can get kits online:
CDC | How do I find an HIV self-test?
(these are usually fingerprick blood tests, and you can either see the results yourself at home immediately, or send it in for analysis, depending on the kit)
If I get HIV, I will get AIDS and die: True or False?
False, assuming you get treatment promptly and keep taking it. So those of you who were at “despair; life is over” can breathe a sigh of relief now.
However, if you get HIV, it does currently mean you will have to take those meds every day for the rest of your (no reason it shouldn’t be long and happy) life.
So, HIV is definitely still something to avoid, because it’s not great to have to take a life-saving medication every day. For a little insight as to what that might be like:
HIV.gov | Taking HIV Medication Every Day: Tips & Challenges
(as you’ll see there, there are also longer-lasting injections available instead of daily pulls, but those are much less widely available)
Summary
Some quick take-away notes-in-a-nutshell:
- Getting HIV may have been a death sentence in the 1980s, but nowadays it’s been relegated to the level of “serious inconvenience”.
- Happily, it is very preventable, with PrEP, PEP, and viral loads so low that they can’t transmit HIV, thanks to ARVs.
- Washing will not help, by the way. Safe sex will, though!
- As will celibacy and/or sexual exclusivity in seroconcordant relationships, e.g. you have the same (known! That means actually tested recently! Not just assumed!) HIV status as each other.
- If you do get it, it is very manageable with ARVs, but prevention is better than treatment
- There is no certain cure—yet. Some people (small number of case studies) may have been cured already with gene therapy, but we can’t know for sure yet.
Want to know more? Check out:
Take care!
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Get Better Sleep: Beyond “Sleep Hygiene”
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Better Sleep, Better Life!
This is Arianna Huffington. Yes, that Huffington, of the Huffington Post. But! She’s also the CEO of Thrive Global, a behavior change tech company with the mission of changing the way we work and live—in particular, by challenging the idea that burnout is the required price of success.
The power of better sleep
Sleep is a very important, but most often neglected, part of good health. Here are some of Huffington’s top insights from her tech company Thrive, and as per her “Sleep Revolution” initiative.
Follow your circadian rhythm
Are you a night owl or a morning lark? Whichever it is, roll with it, and plan around that if your lifestyle allows for such. While it is possible to change from one to the other, we do have a predisposition towards one or the other, and will generally function best when not fighting it.
This came about, by the way, because we evolved to have half of us awake in the mornings and half in the evenings, to keep us all safe. Socially we’ve marched onwards from that point in evolutionary history, but our bodies are about a hundred generations behind the times, and that’s just what we have to work with!
Don’t be afraid (or ashamed!) to take naps
Naps, done right, can be very good for the health—especially if we had a bad night’s sleep the previous night.
Thrive found that workers are more productive when they have nap rooms, and (following on a little from the previous point) are allowed to sleep in or work from home.
See also: How To Nap Like A Pro (No More “Sleep Hangovers”!)
Make sure you have personal space available in bed
The correlation between relationship satisfaction and sleeping close to one’s partner has been found to be so high that it’s even proportional: the further away a couple sleeps from each other, the less happy they are. But…
Partners who got good sleep the previous night, will be more likely to want intimacy on any given night—at a rate of an extra 14% per extra hour of sleep the previous night. So, there’s a trade-off, as having more room in bed tends to result in better sleep. Time to get a bigger bed?
What gets measured, gets done
This goes for sleep, too! Not only does dream-journaling in the morning cue your subconscious to prepare to dream well the following night, but also, sleep trackers and sleep monitoring apps go a very long way to improving sleep quality, even if no extra steps are consciously taken to “score better”.
We’ve previously reviewed some of the most popular sleep apps; you can check out for yourself how they measured up:
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