Successful Aging – by Dr. Daniel Levitin
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We all know about age-related cognitive decline. What if there’s a flipside, though?
Neuroscientist Dr. Daniel Levitin explores the changes that the brain undergoes with age, and notes that it’s not all downhill.
From cumulative improvements in the hippocampi to a dialling-down of the (often overfunctioning) amygdalae, there are benefits too.
The book examines the things that shape our brains from childhood into our eighties and beyond. Many milestones may be behind us, but neuroplasticity means there’s always time for rewiring. Yes, it also covers the “how”.
We learn also about the neurogenesis promoted by such simple acts as taking a different route and/or going somewhere new, and what other things improve the brain’s healthspan.
The writing style is very accessible “pop-science”, and is focused on being of practical use to the reader.
Bottom line: if you want to get the most out of your aging wizening brain, this book is a great how-to manual.
Click here to check out Successful Aging and level up your later years!
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What does lion’s mane mushroom actually do, anyway?
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You may know it as an ingredient in nootropic supplements. You may have heard of lion’s mane mushroom coffee. You may know it as the big shaggy white mushroom that grows in nature and can look very impressive.
What’s special about it?
The lion’s mane mushroom, or Hericium erinaceus (we mention, as studies we’ll cite often use the botanical name) is an adaptogenic agent that has an established ability to promote nerve regeneration through nerve growth factor neurotrophic activity. In other words, it helps (re)grow neurons.
In a 2023 study, researchers wondered if its abilities (well-established in the peripheral nervous system) would work in the central nervous system too, namely the brain, specifically the hippocampus (responsible for memory).
To boil what they found down to a single line, they concluded:
❝[Lion’s mane extract] therefore acts through a novel pan-neurotrophic signaling pathway, leading to improved cognitive performance.❞
You can read the full study for yourself (with pictures!) here:
Limitations of the study
It’s worth noting that the above study was performed on mice brains, not those of humans. As there is a shortage of human volunteers willing to have their brains sliced and examined under microscopes, we do not expect this study to be repeated with humans any time soon.
So, are there human studies that have been done?
There are! Particularly promising was this 2020 study of people with Alzheimer’s disease, wherein supplementation with 1g of lion’s mane mushroom daily for 49 weeks significantly increased cognitive test scores compared with a placebo; you can read about it here:
Additionally, this 2019 study showed that taking 1.2g daily for eight weeks helped relieve depression, anxiety, and sleep disorders in overweight or obese patiences:
Are there other health benefits?
It seems so! Unfortunately, most of its other health claims are only supported by animal studies so far, aside from one small study funded by a supplement company for their supplement that contained mostly Agaricus blazei (a different mushroom) with 14% lion’s mane.
However, in animal studies, lion’s mane has also shown promise:
- For digestion
- Against inflammation
- For cardiovascular health
- For diabetes management
- Against cancer
- Against aging
Where can I get it?
We don’t sell it (or anything else, for that matter) but if you’d like to try it, here’s an example product for your convenience:
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Afterwork – by Joel Malick and Alex Lippert
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Regular 10almonds readers may remember that one of the key unifying factors of Blue Zones supercentenarians is the importance of having purpose, sometimes called ikigai (borrowing the Japanese term, as a nod to the Okinawan Blue Zone).
The authors are financial advisors by profession, but don’t let that fool you; this book is not about retirement financial planning, but rather, simply addressing a problem that was often presented to them while helping people plan their retirements:
A lot of people find themselves adrift without purpose at several points in life. Often, these are: 1) early twenties, 2) some point in the midlife, and/or 3) retirement. This book addresses the third of those life points.
The authors advise cultivating 10 key disciplines; we’ll not keep them a mystery; they are:
- Purpose
- Calendar
- Movement
- Journaling
- Faith
- Connection
- Learning
- Awareness
- Generosity
- Awe
…which each get a chapter in this book.
A note on the chapter about faith: the authors are Christians, and that does influence their perspective here, but if Christianity’s not your thing, then don’t worry: the rest also stands on its own feet without that.
The general “flavor” of the book overall is in essence, embracing a new period of enjoying what is in effect the strongest, most potentially impactful version of you you’ve ever been, as well as avoiding the traps of retirement “sugar rush” and “retirement drift”, to define, well, a more purposeful life—with what’s most meaningful to you.
The style of the book is self-help in layout, with occasional diagrams, flowcharts, and the like; sometimes we see well-sourced stats, but there’s no hard science here. In short, a simple and practical book.
Bottom line: if your retirement isn’t looking like what you imagined it to be, and/or you think it could be more fulfilling, then this book can help you find, claim, and live your ikigai.
Click here to check out Afterwork, and indeed live a future that’s worthy of dreams!
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Which Style Of Yoga Is Best For You?
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For you personally, that is—so let’s look at some options, their benefits, and what kind of person is most likely to benefit from each.
Yoga is, of course, an ancient practice, and like any ancient practice, especially one with so many practitioners (and thus also: so many teachers), there are very many branches to the tree of variations, that is to say, different schools and their offshoots.
Since we cannot possibly cover all of them, we’ll focus on five broad types that are popular (and thus, likely available near to you, unless you live in a very remote place):
Hatha Yoga
This is really the broadest of umbrella categories for yoga as a physical practice of the kind that most immediately comes to mind in the west:
- Purpose: energizes the practitioner through controlled postures and breath.
- Practice: non-heated, slow asanas held for about a minute with intentional transitions
- Benefits: reduces stress, improves flexibility, tones muscles, and boosts circulation.
- Best for: beginners with an active lifestyle.
Vinyasa Yoga
You may also have heard of this called simply “Flow”, without reference to the Mihaly Csikszentmihalyi sense of the word. Rather, it is about a flowing practice:
- Purpose: builds heat and strength through continuous, flowing movement paired with breath.
- Practice: dynamic sequences of the same general kind as the sun salutation, leading to a final resting pose.
- Benefits: enhances heart health, strengthens core, tones muscles, and improves flexibility.
- Best for: beginner to intermediate yogis seeking a cardio-based practice.
Hot Yoga
This one’s well-known and the clue is in the name; it’s yoga practised in a very hot room:
- Purpose: uses heat to increase heart rate, and loosen muscles.
- Practice: heated studio (32–42℃, which is 90–108℉), often with vinyasa flows, resulting in heavy sweating*
- Benefits: burns calories, improves mood, enhances skin, and builds bone density.
- Best for: intermediate yogis comfortable with heat; not recommended for certain health conditions.
*and also sometimes heat exhaustion / heat stroke. This problem arises most readily when the ambient temperature is higher than human body temperature, because that is the point at which sweating ceases to fulfil its biological function of cooling us down.
Noteworthily, a study found that doing the same series of yoga postures in the same manner, but without the heat, produced the same health benefits without the risk:
❝The primary finding from this investigation is that the hatha yoga postures in the Bikram yoga series produce similar enhancements in endothelium-dependent vasodilatation in healthy, middle-aged adults regardless of environmental temperature. These findings highlight the efficacy of yoga postures in producing improvements in vascular health and downplay the necessity of the heated practice environment in inducing vascular adaptations.❞
(“Bikram yoga” is simply the brand name of a particular school of hot yoga)
Yin Yoga
This is a Chinese variation, and is in some ways the opposite of the more vigorous forms, being gentler in pretty much all ways:
- Purpose: promotes deep tissue stretching and circulation by keeping muscles cool.
- Practice: passive, floor-based asanas held for 5–20 minutes in a calming environment.
- Benefits: increases flexibility, enhances circulation, improves mindfulness, and emotional release.
- Best for: all levels, regardless of health or flexibility.
Restorative Yoga
This is often tailored to a specific condition, but it doesn’t have to be:
- Purpose: encourages relaxation and healing through supported, restful poses.
- Practice: reclined, prop-supported postures in a soothing, low-lit setting.
- Benefits: relieves stress, reduces chronic pain, calms the nervous system, and supports healing.
- Best for: those recovering from illness/injury or managing emotional stress.
See for example: Yoga Therapy for Arthritis: A Whole-Person Approach to Movement and Lifestyle
Want to know more?
If you’re still unsure where to start, check out:
Yoga Teacher: “If I wanted to get flexible (from scratch) in 2025, here’s what I’d do”
Take care!
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Stick with It – by Dr. Sean Young
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Most of us know the theory when it comes to building new habits and/or replacing old ones, and maybe we even implement those ideas. So why is our success rate still not as high as we think it should be?
Dr. Sean Young is here to do science to it!
This book comes with advice and explanations that rely a lot less on “that sounds reasonable” and a lot more on “in this recent high-quality study, researchers found…”
And, at 10almonds, we love that. We’re all for trying new things that sound reasonable in general… but we definitely prefer when there’s a stack of solid science to point to, and that’s the kind of thing we recommend!
Dr. Young is big on using that science to find ways to trick our brains and get them working the way we want.
Each chapter has lots of science, lots of explanations, and lots of actionable step-by-step advice.
Bottom line: if you’re all over “Atomic Habits”, this one’s the science-based heavy-artillery for your practical neurohacking.
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Cashew Nuts vs Macadamia Nuts – Which is Healthier?
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Our Verdict
When comparing cashews to macadamias, we picked the cashews.
Why?
In terms of macros, cashews have more than 2x the protein, while macadamias have nearly 2x the fat. The fats are mostly monounsaturated, so it’s still healthy in moderation, but still, we’re going to prize the protein over it and call this category a nominal win for cashews.
When it comes to vitamins, things are fairly even; cashews have more of vitamins B5, B6, B9, and E, while macadamias have more of vitamins B1, B2, B3, and C.
In the category of minerals, cashews take the clear lead; cashews have more copper, iron, magnesium, phosphorus, potassium, selenium, and zinc, while macadamias have more calcium and manganese.
In short, enjoy both (as macadamias have their benefits too), but cashews win in total nutrient density.
Want to learn more?
You might like to read:
Why You Should Diversify Your Nuts
Take care!
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Are You A Calorie-Burning Machine?
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Burn, Calorie, Burn
In Tuesday’s newsletter, we asked you whether you count calories, and got the above-depicted, below-described set of answers:
- About 56% said “I am somewhat mindful of calories but keep only a rough tally”
- About 32% said “I do not count calories / I don’t think it’s important for my health”
- About 13% said “I rigorously check and record the calories of everything I consume”
So what does the science say, about the merits of all these positions?
A food’s calorie count is a good measure of how much energy we will, upon consuming the food, have to use or store: True or False?
False, broadly. It can be, at best, a rough guideline. Do you know what a calorie actually is, by the way? Most people don’t.
One thing to know before we get to that: there’s “cal” vs “kcal”. The latter is generally used when it comes to foodstuffs, and it’s what we’ll be meaning whenever we say “calorie” here. 1cal is 1/1000th of a kcal, that’s all.
Now, for what a calorie actually is:
A calorie is the amount of energy needed to raise the temperature of 1 liter of water by 1℃
Question: so, how to we measure how much food is needed to do that?
Answer: by using a bomb calorimeter! Which is the exciting name for the apparatus used to literally burn food and capture the heat produced to indeed raise the temperature of 1 liter of water by 1℃.
If you’re having trouble imagining such equipment, here it is:
Bomb Calorimeter: Definition, Construction, & Operation (with diagram and FAQs)
The unfortunate implication of the above information
A kilogram of sawdust contains about a 1000 kcal, give or take what wood was used and various other conditions.
However, that does not mean you can usefully eat the sawdust. In other words:
Calorie count tells us only how good something is at raising the temperature of water if physically burned.
Now do you see why oils and sugars have such comparably high calorie counts?
And while we may talk about “burning calories” as a metaphor, we do not, in fact, have a little wood stove inside us burning the food we eat.
A calorie is a calorie: True or False?
Definitely False! Building on from the above… We will get very little energy from sawdust; it’s not just that we can’t use it; we can’t store it either; it’ll mostly pass through as fiber.
(however, please do not use sawdust to get your daily dose of fiber either, as it is not safe for human consumption and may give you diseases, depending on what is lurking in it)
But let’s look at oil and sugar, two very high-calorie categories of food, because they’re really easy to physically burn and they give off a good flame.
A bomb calorimeter may treat them quite equally, but to our body, they are metabolically very different indeed.
For a start, most sugars will get absorbed and processed much more quickly than most oils, and that can overwhelm the liver (responsible for glycogen management), and lead to non-alcoholic fatty liver disease, diabetes, and more. Metabolic syndrome in general, and if you keep it up too much and you may find it’s now a lottery between dying of NAFLD, diabetes, or heart disease (it’ll usually be the heart disease that kills).
See also:
- Which Sugars Are Healthier, And Which Are Just The Same?
- 10 Ways To Balance Blood Sugars
- How To Unfatty A Fatty Liver
Meanwhile, we know all about the different kinds of nutritional profiles that oils can have, and some can promote having high energy without putting on fat, while others can strain the heart. Not even “a fat is a fat”, so “a calorie is a calorie” doesn’t get much mileage outside of a bomb calorimeter!
See also:
A calorie-controlled / calorie-restricted diet is an effective weight loss strategy: True or False?
True, usually! Surprise!
- On the one hand: calories are a wildly imprecise way to reckon the value of food, and using them as a guide to health can be dangerously misleading
- On the other hand: the very activity of calorie-counting itself promotes mindful eating, which is very good for the health
There is a strong difference between the mind of somebody who is carefully logging their pre-bedtime piece of chocolate and reflecting on its nutritional value, vs someone who isn’t sure whether this is their second or third glass of wine, nor how much the glass contained.
So if you want to get most of the benefits of a calorie-controlled diet without counting calories, you may try taking a “mindful eating” approach to diet.
However! If you want to do this for weight loss, be aware, that you will have to practice it all the time, not just for one meal here and there.
You can read more on how to do “mindful eating” here:
Dr. Rupy Aujla: The Kitchen Doctor | Mindful Eating & Interoception
Take care!
Don’t Forget…
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