The Brain-Gut Highway: A Two-Way Street
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The Brain-Gut Two-Way Highway
This is Dr. Emeran Mayer. He has the rather niche dual specialty of being a gastroenterologist and a neurologist. He has published over 353 peer reviewed scientific articles, and he’s a professor in the Departments of Medicine, Physiology, and Psychiatry at UCLA. Much of his work has been pioneering medical research into gut-brain interactions.
We know the brain and gut are connected. What else does he want us to know?
First, that it is a two-way interaction. It’s about 90% “gut tells the brain things”, but it’s also 10% “brain tells the gut things”, and that 10% can make more like a 20% difference, if for example we look at the swing between “brain using that 10% communication to tell gut to do things worse” or “brain using that 10% communication to tell gut to do things better”, vs the midpoint null hypothesis of “what the gut would be doing with no direction from the brain”.
For example, if we are experiencing unmanaged chronic stress, that is going to tell our gut to do things that had an evolutionary advantage 20,000–200,000 years ago. Those things will not help us now. We do not need cortisol highs and adrenal dumping because we ate a piece of bread while stressed.
Read more (by Dr. Mayer): The Stress That Evolution Has Not Prepared Us For
With this in mind, if we want to look after our gut, then we can start before we even put anything in our mouths. Dr. Mayer recommends managing stress, anxiety, and depression from the head downwards as well as from the gut upwards.
Here’s what we at 10almonds have written previously on how to manage those things:
- No-Frills, Evidence-Based Mindfulness
- How To Set Anxiety Aside
- The Mental Health First-Aid You’ll Hopefully Never Need
Do eat for gut health! Yes, even if…
Unsurprisingly, Dr. Mayer advocates for a gut-friendly, anti-inflammatory diet. We’ve written about these things before:
…but there’s just one problem:
For some people, such as with IBS, Crohn’s, and colitis, the Mediterranean diet that we (10almonds and Dr. Mayer) generally advocate for, is inaccessible. If you (if you have those conditions) eat as we describe, a combination of the fiber in many vegetables and the FODMAPs* in many fruits, will give you a very bad time indeed.
*Fermentable Oligo-, Di-, Monosaccharides And Polyols
Dr. Mayer has the answer to this riddle, and he’s not just guessing; he and his team did science to it. In a study with hundreds of participants, he measured what happened with adherence (or not) to the Mediterranean diet (or modified Mediterranean diet) (or not), in participants with IBS (or not).
The results and conclusions from that study included:
❝Among IBS participants, a higher consumption of fruits, vegetables, sugar, and butter was associated with a greater severity of IBS symptoms. Multivariate analysis identified several Mediterranean Diet foods to be associated with increased IBS symptoms.
A higher adherence to symptom-modified Mediterranean Diet was associated with a lower abundance of potentially harmful Faecalitalea, Streptococcus, and Intestinibacter, and higher abundance of potentially beneficial Holdemanella from the Firmicutes phylum.
A standard Mediterranean Diet was not associated with IBS symptom severity, although certain Mediterranean Diet foods were associated with increased IBS symptoms. Our study suggests that standard Mediterranean Diet may not be suitable for all patients with IBS and likely needs to be personalized in those with increased symptoms.❞
In graphical form:
And if you’d like to read more about this (along with more details on which specific foods to include or exclude to get these results), you can do so…
- The study itself (full article): The Association Between a Mediterranean Diet and Symptoms of Irritable Bowel Syndrome
- Dr. Mayer’s blog (lay explanation): The Benefits of a Modified Mediterranean Diet for Irritable Bowel Syndrome
Want to know more?
Dr. Mayer offers many resources, including a blog, books, recipes, podcasts, and even a YouTube channel:
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‘Free birthing’ and planned home births might sound similar but the risks are very different
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The death of premature twins in Byron Bay in an apparent “wild birth”, or free birth, last week has prompted fresh concerns about giving birth without a midwife or medical assistance.
This follows another case from Victoria this year, where a baby was born in a critical condition following a reported free birth.
It’s unclear how common free birthing is, as data is not collected, but there is some evidence free births increased during the COVID pandemic.
Planned home births also became more popular during the pandemic, as women preferred to stay away from hospitals and wanted their support people with them.
But while free births and home births might sound similar, they are a very different practice, with free births much riskier. So what’s the difference, and why might people opt for a free birth?
What are home births?
Planned home births involve care from midwives, who are registered experts in childbirth, in a woman’s home.
These registered midwives work privately, or are part of around 20 publicly funded home birth programs nationally that are attached to hospitals.
They provide care during the pregnancy, labour and birth, and in the first six weeks following the birth.
The research shows that for women with low risk pregnancies, planned home births attended by competent midwives (with links to a responsive mainstream maternity system) are safe.
Home births result in less intervention than hospital births and women perceive their experience more positively.
What are free births?
A free birth is when a woman chooses to have a baby, usually at home, without a registered health professional such as a midwife or doctor in attendance.
Different terms such as unassisted birth or wild pregnancy or birth are also used to refer to free birth.
The parents may hire an unregulated birth worker or doula to be a support at the birth but they do not have the training or medical equipment needed to manage emergencies.
Women may have limited or no health care antenatally, meaning risk factors such as twins and breech presentations (the baby coming bottom first) are not detected beforehand and given the right kind of specialist care.
Why do some people choose to free birth?
We have been studying the reasons women and their partners choose to free birth for more than a decade. We found a previous traumatic birth and/or feeling coerced into choices that are not what the woman wants were the main drivers for avoiding mainstream maternity care.
Australia’s childbirth intervention rates – for induction or augmentation of labour, episiotomy (cutting the tissue between the vaginal opening and the anus) and caesarean section – are comparatively high.
One in ten women report disrespectful or abusive care in childbirth and some decide to make different choices for future births.
Lack of options for a natural birth and birth choices such as home birth or birth centre birth also played a major role in women’s decision to free birth.
Publicly funded home birth programs have very strict criteria around who can be accepted into the program, excluding many women.
In other countries such as the United Kingdom, Netherlands and New Zealand, publicly funded home births are easier to access.
Only around 200 midwives provide private midwifery services for home births nationally. Private midwives are yet to obtain insurance for home births, which means they are risking their livelihoods if something goes wrong and they are sued.
The cost of a home birth with a private midwife is not covered by Medicare and only some health funds rebate some of the cost. This means women can be out of pocket A$6-8,000.
Access to home birth is an even greater issue in rural and remote Australia.
How to make mainstream care more inclusive
Many women feel constrained by their birth choices in Australia. After years of research and listening to thousands of women, it’s clear more can be done to reduce the desire to free birth.
As my co-authors and I outline in our book, Birthing Outside the System: The Canary in the Coal Mine, this can be achieved by:
- making respectful care a reality so women aren’t traumatised and alienated by maternity care and want to engage with it
- supporting midwifery care. Women are seeking more physiological and social ways of birthing, minimising birth interventions, and midwives are the experts in this space
- supporting women’s access to their chosen place of birth and model of care and not limiting choice with high out-of-pocket expenses
- providing more flexible, acceptable options for women experiencing risk factors during pregnancy and/or birth, such as having a previous caesarean birth, having twins or having a baby in breech position. Women experiencing these complications experience pressure to have a caesarean section
- getting the framework right with policies, guidelines, education, research, regulation and professional leadership.
Ensuring women’s rights and choices are informed and respected means they’re less likely to feel they’re left with no other option.
Hannah Dahlen, Professor of Midwifery, Associate Dean Research and HDR, Midwifery Discipline Leader, Western Sydney University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Younger For Life – by Dr. Anthony Youn
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We’ve reviewed anti-aging books before, so what makes this one different? Mostly, it’s the very practical focus.
Which is not to say there’s not also good science in here; there is. But the focus is on what everything means for the reader, not what happened with a certain cohort of lab mice. Instead, he looks at the causes of aging, the process of aging, and what interventions to implement to address those, and reverse many of them.
Some parts are more general lifestyle interventions that 10almonds readers will know well already, but other parts are very specific advices, protocols, and regimes; in particular his skincare section is well worth reading. As for nutrition, there’s even a respectable recipes section, so this book does have it all!
The final section of the book is dedicated to plastic surgeries (the author is a plastic surgeon who believes that most people should not need those, and would do well to stick to the advices in the rest of the book). We suspect this last part of the book will be of least interest to 10almonds readers.
Bottom line: if you’re of the view that getting older should come with as little as possible physical deterioration along the way, then this book can help a lot with that.
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White Noise vs Pink Noise
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It’s Q&A Day at 10almonds!
Have a question or a request? You can always hit “reply” to any of our emails, or use the feedback widget at the bottom!
In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!
As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!
So, no question/request too big or small
❝I live in a large city and even late at night there is always a bit of background noise. While I am pretty used to it by now, I find I don’t sleep nearly as well in the city as I do in the country. I have seen some stuff about “white noise” generators. I was wondering whether you have any thoughts about the science behind these, and whether it is something I should try out – or maybe I should be trying something completly different.❞
The science says…
❝Our data show that white noise significantly improved sleep based on subjective and objective measurements in subjects complaining of difficulty sleeping due to high levels of environmental noise. This suggests that the application of white noise may be an effective tool in helping to improve sleep in those settings.❞
That said, you might also consider “pink noise”, which is very similar to white noise (having all frequencies normally audible to the human ear), but has greater intensity of lower frequencies, creating a more deep and even sound. While white noise and pink noise are both great at “muting” external sounds like those that have been disturbing your sleep, pink noise may have an advantage in helping to stimulate deep and restful sleep:
❝This study demonstrates that steady pink noise has significant effect on reducing brain wave complexity and inducing more stable sleep time to improve sleep quality of individuals.❞
Source: Pink noise: effect on complexity synchronization of brain activity and sleep consolidation
There may be extra benefits to pink noise, too:
Acoustic Enhancement of Sleep Slow Oscillations and Concomitant Memory Improvement in Older Adults
Rest well!
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Kidney Beans vs Pinto Beans – Which is Healthier?
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Our Verdict
When comparing kidney beans to pinto beans, we picked the pinto.
Why?
Looking at the macros first, pinto beans have slightly more protein and carbs, and a lot more fiber, making them the all-round “more food per food” choice.
In the vitamins category, kidney beans have more of vitamins B3, C, and K, while pinto beans have more of vitamins B1, B2, B6, B9, E, and choline; another win for pinto beans. In kidney beans’ defense though, with the exception of vitamin E (31x more in pinto beans) the margins of difference are small for the rest of these vitamins, making kidney beans a close runner-up. Still, at least a nominal win for pinto beans here, by the numbers.
When it comes to minerals, kidney beans are not higher in any minerals, while pinto beans have more calcium, copper, magnesium, manganese, phosphorus, potassium, and selenium. In kidney beans’ defense, though, with the exception of selenium (5–6x more in pinto beans) the margins of difference are small for the rest of these minerals, making kidney beans a fine choice here too. Once again though, a winner is declarable here by the numbers, and it’s pinto beans.
Adding up the three wins makes for one big win for pinto beans. Still, enjoy either or both, because kidney beans are great too, and so is diversity!
Want to learn more?
You might like to read:
What’s Your Plant Diversity Score?
Take care!
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Hummus vs Guacamole – Which is Healthier?
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Our Verdict
When comparing hummus to guacamole, we picked the guacamole.
Why?
First up, let’s assume that the standards are comparable, for example that both have been made with simple whole foods. The hummus is mostly chickpeas with tahini and a little olive oil and some seasoning; the guacamole is mostly avocado with a little lime juice and some seasoning.
In terms of macronutrients, hummus has slightly more protein and fiber, 2x the carbohydrates (but they are healthy carbs), and usually slightly less fat (but the fats are healthy in both cases).
In terms of micronutrients, the hummus is rich in iron and B vitamins, and the guacamole is rich in potassium, magnesium, vitamins C, E, and K.
So far, it’s pretty much tied. What else is there to consider?
We picked the guacamole because some of its nutrients (especially the potassium, magnesium, and vitamin K) are more common deficiencies in most people’s diets than iron and B vitamins. So, on average, it’s probably the one with the nutrients that you need more of at any given time.
So, it was very very close, and it came down to the above as the deciding factor.
However!
- If you like one and not the other? Eat that one; it’s good.
- If you like both but feel like eating one of them in particular? Eat that one; your body is probably needing those nutrients more right now.
- If you are catering for a group of people? Serve both!
- If you are catering for just yourself and would enjoy both? Serve both! There’s nobody to stop you!
Want to read more?
You might like: Avocado Oil vs Olive Oil – Which is Healthier?
Enjoy!
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Applesauce vs Cranberry Sauce – Which is Healthier?
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.
Our Verdict
When comparing applesauce to cranberry sauce, we picked the applesauce.
Why?
It mostly comes down to the fact that apples are sweeter than cranberries:
In terms of macros, they are both equal on fiber (both languishing at a paltry 1.1g/100g), and/but cranberry sauce has 4x the carbs, of which, more than 3x the sugar. Simply, cranberry sauce recipes invariably have a lot of added sugar, while applesauce recipes don’t need that. So this is a huge relative win for applesauce (we say “relative” because it’s still not great, but cranberry sauce is far worse).
In the category of vitamins, applesauce has more of vitamins B1, B2, B5, B6, B9, and C, while cranberry sauce has more of vitamins E, K, and choline. A more moderate win for applesauce this time.
When it comes to minerals, applesauce has more calcium, copper, magnesium, phosphorus, and potassium, while cranberry sauce has more iron, manganese, and selenium. Another moderate win for applesauce.
Since we’ve discussed relative amounts rather than actual quantities, it’s worth noting that neither sauce is a good source of vitamins or minerals, and neither are close to just eating the actual fruits. Just, cranberry sauce is the relatively more barren of the two.
While cranberries famously have some UTI-fighting properties, you cannot usefully gain this benefit from a sauce that (with its very high sugar content and minimal fiber) actively feeds the very C. albicans you are likely trying to kill.
All in all, a pitiful show of nutritional inadequacy from these two products today, but one is relatively less bad than the other, and that’s the applesauce.
Want to learn more?
You might like to read:
From Apples to Bees, and High-Fructose Cs: Which Sugars Are Healthier, And Which Are Just The Same?
Enjoy!
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