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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In Praise Of Walking – by Dr. Shane O’Mara
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At 10almonds we talk often of the health benefits of walking, so what’s new here?
As the subtitle suggests: a new scientific exploration!
Dr. Shane O’Mara is a professor of experimental brain research—and a keen walker. Combining his profession and his passion, he offers us a uniquely well-grounded perspective.
While the writing style is very readable, there’s a lot of science referenced here, with many studies cited. We love that!
We begin our journey by learning what we have in common with sea squirts, and what we have different from all other apes. What we can learn from other humans, from toddlers to supercentenarians.
As one might expect from a professor of experimental brain research, we learn a lot more about what walking does for our brain, than for the rest of our body. We’ve previously talked about walking and cardiovascular health, and brown adipose tissue, and benefits to the immune system, but this book remains steadfastly focused on the brain.
Which just goes to show, what a lot there is to say for the science-based benefits to our brain health, both neurologically and psychologically!
One of the things at which Dr. O’Mara excels that this reviewer hasn’t seen someone do so well before, is neatly tie together the appropriate “why” and “how” to each “what” of the brain-benefits of walking. Not just that walking boosts mood or creativity or problem-solving, say, but why and how it does so.
Often, understanding that can be the difference between being motivated to actually do it or not!
Bottom line: if there’s a book that’ll get you lacing up your walking shoes, this’ll be the one.
Click here to check out “In Praise of Walking” on Amazon, and start reaping the benefits!
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When A Period Is Very Late (Post-Menopause)
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Knowledge Is
PowerSafety, Post-Menopause TooNote: this article will be most relevant for a subset of our subscribership, but it’s a very large subset, so we’re going to go ahead and address the reader as “you”.
If, for example, you are a man and this doesn’t apply to you, we hope it will interest you anyway (we imagine there are women in your life).
PS: the appendicitis check near the end, works for anyone with an appendix
We’ve talked before about things that come with (and continue after) menopause:
- What You Should Have Been Told About The Menopause Beforehand
- What Menopause Does To The Heart
- Alzheimer’s Sex Differences May Not Be What They Appear
But what’s going on if certain menstrual symptoms reappear post-menopause (e.g. after more than a year with no menstruation)?
Bleeding
You should not, of course, be experiencing vaginal bleeding post-menopause. You may have seen “PSA” style posts floating around social media warning that this is a sign of cancer. And, it can be!
But it’s probably not.
Endometrial cancer (the kind that causes such bleeding) affects 2–3% of women, and of those reporting post-menopausal bleeding, the cause is endometrial cancer only 9% of those times.
So in other words, it’s not to be ignored, but for 9 people out of 10 it won’t be cancer:
Read more: Harvard Health | Postmenopausal bleeding: Don’t worry—but do call your doctor
Other more likely causes are uterine fibroids or polyps. These are unpleasant but benign, and can be corrected with surgery if necessary.
The most common cause, however is endometrial and/or vaginal atrophy resulting in tears and bleeding.
Tip: Menopausal HRT will often correct this.
Read more: The significance of “atrophic endometrium” in women with postmenopausal bleeding
(“atrophic endometrium” and “endometrial atrophy” are the same thing)
In summary: no need to panic, but do get it checked out at your earliest convenience. This is not one where we should go “oh that’s weird” and ignore.
Cramps
If you are on menopausal HRT, there is a good chance that these are just period cramps. They may feel different than they did before, because you didn’t ovulate and thus you’re not shedding a uterine lining now, but your body is going to do its best to follow the instructions given by the hormones anyway (hormones are just chemical messengers, after all).
If it is just this, then they will probably settle down to a monthly cycle and become quite predictable.
Tip: if it’s the above, then normal advice for period cramps will go here. We recommend ginger! It’s been found to be as effective as Novafen (a combination drug of acetaminophen (Tylenol), caffeine, and ibuprofen), in the task of relieving menstrual pain:
See: Effect of Ginger and Novafen on menstrual pain: A cross-over trial
It could also be endometriosis. Normally this affects those of childbearing age, but once again, exogenous hormones (as in menopausal HRT) can fool the body into doing it.
If you are not on menopausal HRT (or sometimes even if you are), uterine fibroids (as discussed previously) are once again a fair candidate, and endometriosis is also still possible, though less likely.
Special last note
Important self-check: if you are experiencing a sharp pain in that general area and are worrying if it is appendicitis (also a possibility), then pressing on the appropriately named McBurney’s point is a first-line test for appendicitis. If, after pressing, it hurts a lot more upon removal of pressure (rather than upon application of pressure), this is considered a likely sign of appendicitis. Get thee to a hospital, quickly.
And if it doesn’t? Still get it checked out at your earliest convenience, of course (better safe than sorry), but you might make an appointment instead of calling an ambulance.
Take care!
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Ruminating vs Processing
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When it comes to traumatic experiences, there are two common pieces of advice for being able to move forwards functionally:
- Process whatever thoughts and feelings you need to process
- Do not ruminate
The latter can seem, at first glance, a lot like the former. So, how to tell them apart, and how to do one without the other?
Getting tense
One major difference between the two is the tense in which our mental activity takes place:
- processing starts with the traumatic event (or perhaps even the events leading up to the traumatic event), analyses what happened and if possible why, and then asks the question “ok, what now?” and begins work on laying out a path for the future.
- rumination starts with the traumatic event (or perhaps even the events leading up to the traumatic event), analyses what happened and if why, oh why oh why, “I was such an idiot, if only I had…” and gets trapped in a fairly tight (and destructive*) cycle of blame and shame/anger, never straying far from the events in question.
*this may be directly self-destructive, but it can also sometimes be only indirectly self-destructive, for example if the blame and anger is consciously placed with someone else.
This idea fits in, by the way, with Dr. Elisabeth Kübler-Ross’s “five stages of grief” model; rumination here represents the stages “bargaining”, “despair”, and “anger”, while emotional processing here represents the stage “acceptance”. Thus, it may be that rumination does have a place in the overall process—just don’t get stuck there!
For more on healthily processing grief specifically:
What Grief Does To The Body (And How To Manage It)
Grief, by the way, can be about more than the loss of a loved one; a very similar process can play out with many other kinds of unwanted life changes too.
What are the results?
Another way to tell them apart is to look at the results of each. If you come out of a long rumination session feeling worse than when you started, it’s highly unlikely that you just stopped too soon and were on the verge of some great breakthrough. It’s possible! But not likely.
- Processing may be uncomfortable at first, and if it’s something you’ve ignored for a long time, that could be very uncomfortable at first, but there should quite soon be some “light at the end of the tunnel”. Perhaps not even because a solution seems near, but because your mind and body recognize “aha, we are doing something about it now, and thus may find a better way forward”.
- Rumination tends to intensify and prolong uncomfortable emotions, increases stress and anxiety, and likely disrupts sleep. At best, it may serve as a tipping point to seek therapy or even just recognize “I should figure out a way to deal with this, because this isn’t doing me any good”. At worst, it may serve as a tipping point to depression, and/or substance abuse, and/or suicidality.
See also: How To Stay Alive (When You Really Don’t Want To) ← which also has a link back to our article on managing depression, by the way!
Did you choose it, really?
A third way to tell them apart is the level of conscious decision that went into doing it.
- Processing is almost always something that one decides “ok, let’s figure this out”, and sits down to figure it out.
- Rumination tends to be about as voluntary as social media doomscrolling. Technically we may have decided to begin it (we also might not have made any conscious decision, and just acted on impulse), but let’s face it, our hands weren’t at the wheel for long, at all.
A good way to make sure that it is a conscious process, is to schedule time for it in advance, and then do it only during that time. If thoughts about it come up at other times, tell yourself “no, leave that for later”, and then deal with it when (and only when) the planned timeslot arrives.
It’s up to you and your schedule what time you pick, but if you’re unsure, consider an hour in the early evening. That means that the business of the day is behind you, but it’s also not right before bed, so you should have some decompression time as a buffer. So for example, perhaps after dinner you might set a timer* for an hour, and sit down to journal, brainstorm, or just plain think, about the matter that needs processing.
*electronic timers can be quite jarring, and may distract you while waiting for the beeps. So, consider investing in a relaxing sand timer like this one instead.
Is there any way to make rumination less bad?
As we mentioned up top, there’s a case to be made for “rumination is an early part of the process that gets us where we need to go, and may not be skippable, or may not be advisable to skip”.
So, if you are going to ruminate, then firstly, we recommend again bordering it timewise (with a timer as above) and having a plan to pull yourself out when you’re done rather than getting stuck there (such as: The Off-Button For Your Brain: How To Stop Negative Thought Spirals).
And secondly, you might want to consider the following technique, which allows one to let one’s brain know that the thing we’re thinking about / imagining is now to be filed away safely; not lost or erased, but sent to the same place that nightmares go after we wake up:
A Surprisingly Powerful Tool: Eye Movement Desensitization & Reprocessing (EMDR)
What if I actually do want to forget?
That’s not usually recommendable; consider talking it through with a therapist first. However, for your interest, there is a way:
The Dark Side Of Memory (And How To Forget)
Take care!
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Immunity – by Dr. William Paul
10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.
This book gives a very person-centric (i.e., focuses on the contributions of named individuals) overview of advances in the field of immunology—up to its publication date in 2015. So, it’s not cutting edge, but it is very good at laying the groundwork for understanding more recent advances that occur as time goes by. After all, immunology is a field that never stands still.
We get a good grounding in how our immune system works (and how it doesn’t), the constant arms race between pathogens and immune responses, and the complexities of autoimmune disorders and—which is functionally in an overlapping category of disease—cancer. And, what advances we can expect soon to address those things.
Given the book was published 8 years ago, how did it measure up? Did we get those advances? Well, for the mostpart yes, we have! Some are still works in progress. But, we’ve also had obvious extra immunological threats in years since, which have also resulted in other advances along the way!
If the book has a downside, it’s that sometimes the author can be a little too person-centric. It’s engaging to focus on human characters, and helps us bring information to life; name-dropping to excess, along with awards won, can sometimes feel a little like the book was co-authored by Tahani Al-Jamil.
Nevertheless, it certainly does keep the book from getting too dry!
Bottom line: this book is a great overview of immunology and immunological research, for anyone who wants to understand these things better.
Click here to check out Immunity, and boost your knowledge of yours!
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Clean Treats For Everyone – by Laura Fuentes
10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.
First let’s break down the title:
- Clean = simple ingredients that are mostly healthy and are minimally processed
- Treats = this is a book of dessert-and-similar recipes
- For Everyone = options are given to make recipes (as applicable) dairy-free, nut-free, gluten-free, etc.
When we say “desserts and similar” we mean that there are also sweet snacks that probably one wouldn’t serve as a dessert after a meal, but are nevertheless thematically more dessert-like than a savory thing might be.
The recipes are mostly quite simple, though it’ll still require a little practice, if you’re not already proficient, to get some of the things “just right”.
In terms of healthiness, most of this is indeed very healthy. There are some things where the healthiness is an illusion, such as butter, ghee, coconut palm sugar, maple syrup, and the like. However, if sticking to small portions for recipes that use those, then this is not a terrible problem.
Bottom line: if you like desserts and sweet snacks, but like to be healthy, then this book will help expand your culinary repertoire in that direction.
Click here to check out Clean Treats For Everyone, and enjoy!
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Mocktails – by Moira Clark
10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.
We’ve reviewed books about quitting alcohol before (such as this one), but today’s is not about quitting, so much as about enjoying non-alcoholic drinks; it’s simply a recipe book of zero-alcohol cocktails, or “mocktails”.
What sets this book apart from many of its kind is that every recipe uses only natural and fresh ingredients, rather than finding in the ingredients list some pre-made store-bought component. Instead, because of its “everything from scratch” approach, this means:
- Everything is reliably as healthy as the ingredients you use
- Every recipe’s ingredients can be found easily unless you live in a food desert
Each well-photographed and well-written recipe also comes with a QR code to see a step-by-step video tutorial (or if you get the ebook version, then a direct link as well).
Bottom line: this is the perfect mocktail book to have in (and practice with!) before the summer heat sets in.
Click here to check out Mocktails: A Delicious Collection of Non-Alcoholic Drinks, and get mixing!
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