The Alzheimer’s Gut-Brain Connection—Caught On X-Ray!
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We’ve written before about Alzheimer’s disease (a lot), and if you’re just joining us, then a great place to start is here:
How To Reduce Your Alzheimer’s Risk
We’ve also written about gut health (a lot), and if you’re just joining us, then a great place to start is here:
Make Friends With Your Gut! (Here’s Why & How)
And as a hat trick, yes, we’ve also written (admittedly not as much) about the gut-brain connection; here’s a primer:
The Brain-Gut Highway: A Two-Way Street
Because of how gut microbes influence brain function, behavior, and cognition, scientists wondered whether one’s microbiome might play a role in Alzheimer’s development. Recently, scientists from Italy’s Institute of Nanotechnology, working with the European Synchrotron Radiation Facility (ESRF), found some concrete answers:
How gut health affects Alzheimer’s
When the gut loses its healthy balance of bacteria, harmful bacteria (and fungi, like C. albicans, also popularly called by its first name, “Candida”) take the wheel. This problem (called “dysbiosis”) allows harmful microbes to produce toxic substances, leading to inflammation and weakening the protective barriers between the gut and brain.
In some cases, like the aforementioned C. albicans, they’ll even put roots through your gut wall (and interact with your nervous system, and they are a common reason for sugar and alcohol cravings—your CNS has literally been hacked by a fungal colony that wants sugar (including the sugar that occurs when alcohol is broken down—and that’s without considering the fact that alcohol also kills several of C. albicans competitors that rank amongst the “good bacteria”). Suffice it to say, the holes it puts in your gut wall aren’t great for the health either.
In any case, once the gut barrier is breached, it’s been hypothesized that harmful bacteria may even travel to the brain, triggering Alzheimer’s.
How the x-rays helped
To better understand gut changes in Alzheimer’s, scientists used a technique called nano- and micro- x-ray phase-contrast tomography (XPCT) at the aforementioned ESRF. That very fancy string of words refers to a commensurately powerful imaging method, which allows researchers to see detailed structures inside the gut without damaging tissue, or even adding contrast agents (like those unpleasant drinks that are sometimes required to be taken before soft-tissue x-rays).
The study examined gut samples from mice with Alzheimer’s (so yes, this does need to be repeated with humans, but in this case there’s no obvious reason why it shouldn’t be the same).
The scans revealed important changes in gut structures, including:
- The tiny finger-like villi and corresponding crypts in the gut lining
- Important cells* that help with digestion and protection
- Neurons involved in gut function
*e.g. Paneth cells, goblet cells, telocytes, and erythrocytes, all of whom would take more explanation than we have room for here, but suffice it to say they’re important to both digestion and correct mucus production (bearing in mind, mucus membranes are one of the main physical barriers to harmful bacteria—as humans, our conscious interactions with mucus are usually only the nuisance that occurs when we get a cold or something, but rest assured, mucus keeps us alive).
In short, all these findings suggest (we’d say “show”, but technically cause and effect have not been proven) gut health indeed plays a crucial role in Alzheimer’s disease pathogenesis and pathology (i.e., how the disease begins and progresses, respectively).
Why it matters
To quote Dr. Alessia Cedola,
❝This technique represents a real breakthrough for the thorough analysis of the gut, and it could be pivotal in early detection and prognosis of the disease.
By gaining a deeper understanding of these processes, we hope to identify new therapeutic targets and develop innovative treatments for this devastating disease.❞
In short: the technology can be used as a super-early diagnostic tool, and ultimately, improve prevention (by encouraging people to focus on gut health) as well as, hopefully, leading to new treatments, too.
Want to see it?
Here’s the paper itself, where there are also abundant very clear images:
Are you on top of your gut health already?
If not, do refer back to that first link we dropped about gut health, up top!
If you are already sure you’re looking after your gut and want to do something else to avoid Alzheimer’s coming to call, you might want to consider:
How To Clean Your Brain (Glymphatic Health Primer) ← your glymphatic system, something many people neglect, is the brain’s cleanup crew, and removes things like the beta-amyloid proteins that are implicated in Alzheimer’s pathogenesis. So, it’s worth knowing how to keep it in working order!
Take care!
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Chocolate & Health
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Chocolate & Health: Fact or Fiction?
“Chocolate Is Good For The Heart”
“When making chocolate chip cookies, you don’t measure using cups, you measure by heart”
…but how good is chocolate when it comes to heart health?
First, what is heart health?
A healthy heart typically has a low resting pulse rate and a strong, steady beat. This is affected strongly by exercise habits, and diet plays only a support role (can’t exercise without energy from food!).
It is also important to have blood pressure within a healthy range (with high blood pressure being a more common problem than low, so things that lower blood pressure are generally considered good).
- Flavanols, flavonoids, and polyphenols in chocolate contribute to lower blood pressure
- Dark chocolate is best for these, as milk chocolate contains much less cocoa solids and more unhelpful fats
- White chocolate contains no cocoa solids and is useless for this
- Some of the fats in most commercial chocolate can contribute to atherosclerosis which raises blood pressure and ultimately can cause heart attacks.
- If you’re diabetic, you will probably not get the usual heart-related benefits from chocolate (sorry)
The Verdict: dark chocolate, in moderation, can support good heart health.
“Chocolate Is Good For The Brain”
Chocolate has been considered a “brain food”… why?
- The brain uses more calories than any other organ (chocolate has many calories)
- The heart benefits we listed above mean improved blood flow—including to your brain
- Chocolate contains phenylethylamine, a powerful chemical that has a similar effect to amphetamines… But it’s metabolized in digestion and never makes it to the central nervous system (so basically, this one’s a miss; we had a good run with the other two, though!)
The Verdict: dark chocolate, in moderation, can support good brain health
“Chocolate Is An Aphrodisiac”
“If chocolate be the food of love, pass me that cocoa; I’m starving”
Most excitingly, chocolate contains phenylethylamine, the “molecule of love” or, more accurately, lust. It has an effect similar to amphetamines, and while we can synthesize it in the body, we can also get it from certain foods. But…
Our body is so keen to get it that most of it is metabolized directly during digestion and doesn’t make it to the brain. Also, chocolate is not as good a source as cabbage—do with that information what you will!
However!
Chocolate contains theobromine and small amounts of caffeine, both stimulants and both generally likely to improve mood; it also contains flavonoids which in turn stimulate production of nitric oxide, which is a relaxant. All in all, things that are convivial to having a good time.
On the other hand…
That relaxation comes specifically with a reduction in blood pressure—something typically considered good for the health for most people most of the time… but that means lowering blood pressure in all parts of your body, which could be the opposite of what you want in intimate moments.
Chocolate also contains zinc, which is essential for hormonal health for most people—the body uses it to produce testosterone and estrogen, respectively. Zinc supplements are popularly sold to those wishing to have more energy in general and good hormonal health in particular, and rightly so. However…
This approach requires long-term supplementation—you can’t just pop a zinc tablet / bar of chocolate / almond before bed and expect immediate results. And if your daily zinc supplementation takes the form of a 3.5oz (100g) bar of chocolate, then you may find it has more effects on your health, and not all of them good!
The Verdict: dark chocolate, in moderation, may promote “the mood”, but could be a double-edged sword when it comes to “the ability”.
“Chocolate Is Good During Menstruation”
The popular wisdom goes that chocolate is rich in iron (of which more is needed during menstruation), and indeed, if you eat 7oz (150g) of dark chocolate made with 85% cocoa, you’ll get a daily a dose of iron (…and nearly 1,000 calories).
More bang-for-buck dietary sources of iron include chickpeas and broccoli, but for some mysterious reason, these are not as commonly reported as popular cravings.
The real explanation for chocolate cravings is more likely that eating chocolate—a food high in sugar and fat along with a chemical bombardment of more specialized “hey, it’s OK, you can relax now” molecules (flavanols/flavonoids, polyphenols, phenylamines, even phenylethylamine, etc) gives a simultaneous dopamine kick (the body’s main “reward” chemical) with a whole-body physiological relaxation… so, little wonder we might crave it in times of stress and discomfort!
The Verdict: it helps, not because it serves a special nutritional purpose, but rather, because the experience of eating chocolate makes us feel good.
Fun fact: Tiramisu (this writer’s favorite dessert) is literally Italian for “pick-me-up”
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Tartar Removal At Home & How To Prevent Tartar
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Three things to bear in mind:
- Tartar is hardened plaque.
- Plaque is an infected biofilm that expands the natural thin film on teeth.
- Healthy biofilm resists plaque and tartar formation.
Therefore, the recommended approach is a multistep program:
The Complete Mouth Care System
Dr. Phillips recommends to use these five products in this order twice daily:
- Zellie’s Mints & Gum: having 6–10 grams of xylitol daily will help to loosen plaque on teeth so that the following program is more effective. Xylitol protects from mouth acidity and help to remineralize teeth.
- CloSYS Prerinse: CloSYS will prepare your teeth for brushing. This pH neutral rinse ensures that brushing teeth does not occur in an acidic mouth and therefore easily damage teeth.
- Crest Cavity Protection Regular Paste: has an active ingredient of sodium fluoride at optimal concentration (not stannous fluoride). This paste has the proper abrasion and no glycerine.
- Listerine: is an effective rinse that targets the bacteria that cause plaque build up and gingivitis with three active ingredients: eucalyptus essential oil, menthol essential oil, and thymol essential oil. As such, unlike many mouthwashes, listerine does not harm the mouth’s diversity of good bacteria or the mouth’s production of nitric oxide.
- ACT Anticavity Rinse: ACT is a very dilute but extremely effective sodium fluoride solution. It helps prevent and reverse cavities, strengthen teeth, reduce sensitivity, and leaves your breath fresh.
She advises us that by doing this twice-daily over 6 months, we can expect significant tartar reduction, and indeed, that dental appointments may reveal minimal or no need for tartar removal.
For more on all of this, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read our own three-part series:
- Toothpastes & Mouthwashes: Which Help And Which Harm?
- Flossing Without Flossing?
- Less Common Oral Hygiene Options ← we recommend the miswak! Not only does it clean the teeth as well as or better than traditional brushing, but also it changes the composition of saliva to improve the oral microbiome, effectively turning your saliva into a biological mouthwash that kills unwanted microbes and is comfortable for the ones that should be there.
Take care!
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Peony Against Inflammation & More
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.
Yes, this is about the flower, especially white peony (Paeonia lactiflora), and especially the root thereof (Paeoniae radix alba). Yes, the root gets a different botanical name but we promise it is the same plant. You will also read about its active glycoside paeoniflorin, and less commonly, albiflorin (a neuroprotective glycoside present in the root).
It’s one of those herbs that has made its way out of Traditional Chinese Medicine and into labs around the world.
It can be ingested directly as food, or as a powder/capsule, or made into tea.
Anti-inflammatory
Peony suppresses inflammatory pathways, which thus reduces overall inflammation. In particular, this research review found:
❝Pharmacologically, paeoniflorin exhibits powerful anti-inflammatory and immune regulatory effects in some animal models of autoimmune diseases including Rheumatoid Arthritis (RA) and Systemic Lupus Erythematosus (SLE)❞
The reviewers also (albeit working from animal models) suggest it may be beneficial in cases of kidney disease and liver disease, along with other conditions.
Here’s a larger review, which also has studies involving humans (and in vivo studies), that found it to effectively help treat autoimmune conditions including rheumatoid arthritis and psoriasis, amongst others:
❝Modern pharmacological research on TGP is based on the traditional usage of PRA, and its folk medicinal value in the treatment of autoimmune diseases has now been verified. In particular, TGP has been developed into a formulation used clinically for the treatment of autoimmune diseases.
Based on further research on its preparation, quality control, and mechanisms of action, TGP is expected to eventually play a greater role in the treatment of autoimmune diseases. ❞
(TGP = Total Glucosides of Paeony)
Antidepressant / Anxiolytic
It also acts as a natural serotonin reuptake inhibitor (as per many pharmaceutical antidepressants), by reducing the expression of the serotonin transporter protein:
Gut Microbiota-Based Pharmacokinetics and the Antidepressant Mechanism of Paeoniflorin
(remember, most serotonin is produced in the gut)
Here’s how that played out when tested (on rats, though):
Against PMS and/or menopause symptoms
Peony is widely used in Traditional Chinese Medicine to reduce these symptoms in general. However, we couldn’t find a lot of good science for that, although it is very plausible (as the extract contains phytoestrogens and may upregulate estrogen receptors while dialling down testosterone production). Here’s the best we could find for that, and it’s a side-by-side along with licorice root:
❝Paeoniflorin, glycyrrhetic acid and glycyrrhizin decreased significantly the testosterone production but did not change that of delta 4-androstenedione and estradiol. Testosterone/delta 4-androstenedione production ratio was lowered significantly by paeoniflorin, glycyrrhetic acid and glycyrrhizin❞
Effect of paeoniflorin, glycyrrhizin and glycyrrhetic acid on ovarian androgen production
(note: that it didn’t affect estradiol levels is reasonable; it contains phytoestrogens after all, not estradiol—and in fact, if you are taking estradiol, you might want to skip this one, as its phytoestrogens could compete with your estradiol for receptors)
Want to try some?
We don’t sell it, but here for your convenience is an example product on Amazon 😎
Enjoy!
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Reflexology: What The Science Says
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How Does Reflexology Work, Really?
In Wednesday’s newsletter, we asked you for your opinion of reflexology, and got the above-depicted, below-described set of responses:
- About 63% said “It works by specific nerves connecting the feet and hands to various specific organs, triggering healing remotely”
- About 26% said “It works by realigning the body’s energies (e.g. qi, ki, prana, etc), removing blockages and improving health“
- About 11% said “It works by placebo, at best, and has no evidence for any efficacy beyond that”
So, what does the science say?
It works by realigning the body’s energies (e.g. qi, ki, prana, etc), removing blockages and improving health: True or False?
False, or since we can’t prove a negative: there is no reliable scientific evidence for this.
Further, there is no reliable scientific evidence for the existence of qi, ki, prana, soma, mana, or whatever we want to call it.
To save doubling up, we did discuss this in some more detail, exploring the notion of qi as bioelectrical energy, including a look at some unreliable clinical evidence for it (a study that used shoddy methodology, but it’s important to understand what they did wrong, to watch out for such), when we looked at [the legitimately very healthful practice of] qigong, a couple of weeks ago:
Qigong: A Breath Of Fresh Air?
As for reflexology specifically: in terms of blockages of qi causing disease (and thus being a putative therapeutic mechanism of action for attenuating disease), it’s an interesting hypothesis but in terms of scientific merit, it was pre-emptively supplanted by germ theory and other similarly observable-and-measurable phenomena.
We say “pre-emptively”, because despite orientalist marketing, unless we want to count some ancient pictures of people getting a foot massage and say it is reflexology, there is no record of reflexology being a thing before 1913 (and that was in the US, by a laryngologist working with a spiritualist to produce a book that they published in 1917).
It works by specific nerves connecting the feet and hands to various specific organs, triggering healing remotely: True or False?
False, or since we can’t prove a negative: there is no reliable scientific evidence for this.
A very large independent review of available scientific literature found the current medical consensus on reflexology is that:
- Reflexology is effective for: anxiety (but short lasting), edema, mild insomnia, quality of sleep, and relieving pain (short term: 2–3 hours)
- Reflexology is not effective for: inflammatory bowel disease, fertility treatment, neuropathy and polyneuropathy, acute low back pain, sub acute low back pain, chronic low back pain, radicular pain syndromes (including sciatica), post-operative low back pain, spinal stenosis, spinal fractures, sacroiliitis, spondylolisthesis, complex regional pain syndrome, trigger points / myofascial pain, chronic persistent pain, chronic low back pain, depression, work related injuries of the hip and pelvis
Source: Reflexology – a scientific literary review compilation
(the above is a fascinating read, by the way, and its 50 pages go into a lot more detail than we have room to here)
Now, those items that they found it effective for, looks suspiciously like a short list of things that placebo is often good for, and/or any relaxing activity.
Another review was not so generous:
❝The best evidence available to date does not demonstrate convincingly that reflexology is an effective treatment for any medical condition❞
~ Dr. Edzard Ernst (MD, PhD, FMedSci)
Source: Is reflexology an effective intervention? A systematic review of randomised controlled trials
In short, from the available scientific literature, we can surmise:
- Some researchers have found it to have some usefulness against chiefly psychosomatic conditions
- Other researchers have found the evidence for even that much to be uncompelling
It works by placebo, at best, and has no evidence for any efficacy beyond that: True or False?
Mostly True; of course reflexology runs into similar problems as acupuncture when it comes to testing against placebo:
How Does One Test Acupuncture Against Placebo Anyway?
…but not quite as bad, since it is easier to give a random foot massage while pretending it is a clinical treatment, than to fake putting needles into key locations.
However, as the paper we cited just above (in answer to the previous True/False question) shows, reflexology does not appear to meaningfully outperform placebo—which points to the possibility that it does work by placebo, and is just a placebo treatment on the high end of placebo (because the placebo effect is real, does work, isn’t “nothing”, and some placebos work better than others).
For more on the fascinating science and useful (applicable in daily life!) practicalities of how placebo does work, check out:
How To Leverage Placebo Effect For Yourself
Take care!
Don’t Forget…
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How to Eat 30 Plants a Week – by Hugh Fearnley-Whittingstall
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.
If you’re used to eating the same two fruits and three vegetables in rotation, the “gold standard” evidence-based advice to “eat 30 different plants per week” can seem a little daunting.
Where this book excels is in reminding the reader to use a lot of diverse plants that are readily available in any well-stocked supermarket, but often get forgotten just because “we don’t buy that”, so it becomes invisible on the shelf.
It’s not just a recipe book (though yes, there are plenty of recipes here); it’s also advice about stocking up and maintaining that stock, advice on reframing certain choices to inject a little diversity into every meal without it become onerous, meal-planning rotation advice, and a lot of recipes that are easy but plant-rich, for example “this soup that has these six plants in it”, etc.
He also gives, for those eager to get started, “10 x 3 recipes per week to guarantee your 30”, in other words, 10 sets of 3 recipes, wherein each set of 3 recipes uses >30 different plants between them, such that if we have each of these set-of-three meals over the course of the week, then what we do in the other 4–18 meals (depending on how many meals per day you like to have) is all just a bonus.
The latter is what makes this book an incredibly stress-free approach to more plant-diverse eating for life.
Bottom line: if you want to be able to answer “do you get your five-a-day?” with “you mean breakfast?” because you’ve already hit five by breakfast each day, then this is the book for you.
Click here to check out How To Eat 30 Plants A Week, and indeed eat 30+ different plants per week!
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The Worry Trick – by Dr. David Carbonell
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Worry is a time-sink that rarely does us any good, and often does us harm. Many books have been written on how to fight anxiety… That’s not what this book’s about.
Dr. David Carbonell, in contrast, encourages the reader to stop trying to avoid/resist anxiety, and instead, lean into it in a way that detoothes it.
He offers various ways of doing this, from scheduling time to worry, to substituting “what if…” with “let’s pretend…”, and guides the reader through exercises to bring about a sort of worry-desensitization.
The style throughout is very much pop-psychology and is very readable.
If the book has a weak point, it’s that it tends to focus on worrying less about unlikely outcomes, rather than tackling worry that occurs relating to outcomes that are likely, or even known in advance. However, some of the techniques will work for such also! That’s when Dr. Carbonell draws from Acceptance and Commitment Therapy (ACT).
Bottom line: if you would like to lose less time and energy to worrying, then this is a fine book for you.
Click here to check out The Worry Trick, and repurpose your energy reserves!
Don’t Forget…
Did you arrive here from our newsletter? Don’t forget to return to the email to continue learning!
Learn to Age Gracefully
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