Life Lessons From A Brain Surgeon – by Dr. Rahul Jandial
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In the category of surgeons with a “what to put on your table to stay off mine” angle, this book packs an extra punch. As well as being an experienced brain surgeon, Dr. Jandial also does a lot of cutting edge lab research too. What does this mean for us?
This book gives, as the subtitle promises, “practical strategies for peak health and performance”—with a brain-centric bias, of course.
From diet and nootropic supplements, to exercise and brain-training, we get a good science-based view of which ones actually work, and which don’t. The style is also very readable; Dr. Jandial is a great educator, presenting genuine scientific content with very accessible language.
Bottom line: if you’d indeed like to look after your most important organ optimally, this book gives a lot of key pointers, without unnecessary fluff.
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How Likely Are You To Live To 100?
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How much hope can we reasonably have of reaching 100?
Yesterday, we asked you: assuming a good Health-Related Quality of Life (HRQoL), how much longer do you hope to live?
We got the above-depicted, below-described, set of responses:
- A little over 38% of respondents hope to live another 11–20 years
- A little over 31% hope to live another 31–40 years
- A little over 7% will be content to make it to the next decade
- One (1) respondent hopes to live longer than an additional 100 years
This is interesting when we put it against our graph of how old our subscribers are:
…because it corresponds inversely, right down to the gap/dent in the 40s. And—we may hypothesize—that one person under 18 who hopes to live to 120, perhaps.
This suggests that optimism remains more or less constant, with just a few wobbles that would probably be un-wobbled with a larger sample size.
In other words: most of our education-minded, health-conscious subscriber-base hope to make it to the age of 90-something, while for the most part feeling that 100+ is overly optimistic.
Writer’s anecdote: once upon a time, I was at a longevity conference in Brussels, and a speaker did a similar survey, but by show of hands. He started low by asking “put your hands up if you want to live at least a few more minutes”. I did so, with an urgency that made him laugh, and say “Don’t worry; I don’t have a gun hidden up here!”
Conjecture aside… What does the science say about our optimism?
First of all, a quick recap…
To not give you the same information twice, let’s note we did an “aging mythbusting” piece already covering:
- Aging is inevitable: True or False?
- Aging is, and always will be, unstoppable: True or False?
- We can slow aging: True or False?
- It’s too early to worry about… / It’s too late to do anything about… True or False?
- We can halt aging: True or False?
- We can reverse aging: True or False?
- But those aren’t really being younger, we’ll still die when our time is up: True or False?
You can read the answers to all of those here:
Age & Aging: What Can (And Can’t) We Do About It?
Now, onwards…
It is unreasonable to expect to live past 100: True or False?
True or False, depending on your own circumstances.
First, external circumstances: the modal average person in Hong Kong is currently in their 50s and can expect to live into their late 80s, while the modal average person in Gaza is 14 and may not expect to make it to 15 right now.
To avoid extremes, let’s look at the US, where the modal average person is currently in their 30s and can expect to live into their 70s:
United States Mortality Database
Now, before that unduly worries our many readers already in their 70s…
Next, personal circumstances: not just your health, but your socioeconomic standing. And in the US, one of the biggest factors is the kind of health insurance one has:
SOA Research Institute | Life Expectancy Calculator 2021
You may note that the above source puts all groups into a life expectancy in the 80s—whereas the previous source gave 70s.
Why is this? It’s because the SOA, whose primary job is calculating life insurance risks, is working from a sample of people who have, or are applying for, life insurance. So it misses out many people who die younger without such.
New advances in medical technology are helping people to live longer: True or False?
True, assuming access to those. Our subscribers are mostly in North America, and have an economic position that affords good access to healthcare. But beware…
On the one hand:
The number of people who live past the age of 100 has been on the rise for decades
On the other hand:
The average life expectancy in the U.S. has been on the decline for three consecutive years
COVID is, of course, largely to blame for that, though:
❝The decline of 1.8 years in life expectancy was primarily due to increases in mortality from COVID-19 (61.2% of the negative contribution).
The decline in life expectancy would have been even greater if not for the offsetting effects of decreases in mortality due to cancer (43.1%)❞
Source: National Vital Statistics Reports
The US stats are applicable to Canada, the UK, and Australia: True or False?
False: it’s not quite so universal. Differences in healthcare systems will account for a lot, but there are other factors too:
- Life expectancy in Canada fell for the 3rd year in a row. What’s happening?
- UK life expectancy lagging behind rest of G7 except the US
- Australians are living longer but what does it take to reach 100 years old?
Here’s an interesting (UK-based) tool that calculates not just your life expectancy, but also gives the odds of living to various ages (e.g. this writer was given odds of living to 87, 96, 100).
Check yours here:
Office of National Statistics | Life Expectancy Calculator
To finish on a cheery note…
Data from Italian centenarians suggests a “mortality plateau”:
❝The risk of dying leveled off in people 105 and older, the team reports online today in Science.
That means a 106-year-old has the same probability of living to 107 as a 111-year-old does of living to 112.
Furthermore, when the researchers broke down the data by the subjects’ year of birth, they noticed that over time, more people appear to be reaching age 105.❞
Pop-sci source: Once you hit this age, aging appears to stop
Actual paper: The plateau of human mortality: demography of longevity pioneers
Take care!
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From straight to curly, thick to thin: here’s how hormones and chemotherapy can change your hair
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Head hair comes in many colours, shapes and sizes, and hairstyles are often an expression of personal style or cultural identity.
Many different genes determine our hair texture, thickness and colour. But some people’s hair changes around the time of puberty, pregnancy or after chemotherapy.
So, what can cause hair to become curlier, thicker, thinner or grey?
Curly or straight? How hair follicle shape plays a role
Hair is made of keratin, a strong and insoluble protein. Each hair strand grows from its own hair follicle that extends deep into the skin.
Curly hair forms due to asymmetry of both the hair follicle and the keratin in the hair.
Follicles that produce curly hair are asymmetrical and curved and lie at an angle to the surface of the skin. This kinks the hair as it first grows.
The asymmetry of the hair follicle also causes the keratin to bunch up on one side of the hair strand. This pulls parts of the hair strand closer together into a curl, which maintains the curl as the hair continues to grow.
Follicles that are symmetrical, round and perpendicular to the skin surface produce straight hair.
Each hair strand grows from its own hair follicle.
Mosterpiece/ShutterstockLife changes, hair changes
Our hair undergoes repeated cycles throughout life, with different stages of growth and loss.
Each hair follicle contains stem cells, which multiply and grow into a hair strand.
Head hairs spend most of their time in the growth phase, which can last for several years. This is why head hair can grow so long.
Let’s look at the life of a single hair strand. After the growth phase is a transitional phase of about two weeks, where the hair strand stops growing. This is followed by a resting phase where the hair remains in the follicle for a few months before it naturally falls out.
The hair follicle remains in the skin and the stems cells grow a new hair to repeat the cycle.
Each hair on the scalp is replaced every three to five years.
Each hair on the scalp is replaced every three to five years.
Just Life/ShutterstockHormone changes during and after pregnancy alter the usual hair cycle
Many women notice their hair is thicker during pregnancy.
During pregnancy, high levels of oestrogen, progesterone and prolactin prolong the resting phase of the hair cycle. This means the hair stays in the hair follicle for longer, with less hair loss.
A drop in hormones a few months after delivery causes increased hair loss. This is due to all the hairs that remained in the resting phase during pregnancy falling out in a fairly synchronised way.
Hair can change around puberty, pregnancy or after chemotherapy
This is related to the genetics of hair shape, which is an example of incomplete dominance.
Incomplete dominance is when there is a middle version of a trait. For hair, we have curly hair and straight hair genes. But when someone has one curly hair gene and one straight hair gene, they can have wavy hair.
Hormonal changes that occur around puberty and pregnancy can affect the function of genes. This can cause the curly hair gene of someone with wavy hair to become more active. This can change their hair from wavy to curly.
Researchers have identified that activating specific genes can change hair in pigs from straight to curly.
Chemotherapy has very visible effects on hair. Chemotherapy kills rapidly dividing cells, including hair follicles, which causes hair loss. Chemotherapy can also have genetic effects that influence hair follicle shape. This can cause hair to regrow with a different shape for the first few cycles of hair regrowth.
Your hair can change at different stages of your life.
Igor Ivakhno/ShutterstockHormonal changes as we age also affect our hair
Throughout life, thyroid hormones are essential for production of keratin. Low levels of thyroid hormones can cause dry and brittle hair.
Oestrogen and androgens also regulate hair growth and loss, particularly as we age.
Balding in males is due to higher levels of androgens. In particular, high dihydrotestosterone (sometimes shortened to DHT), which is produced in the body from testosterone, has a role in male pattern baldness.
Some women experience female pattern hair loss. This is caused by a combination of genetic factors plus lower levels of oestrogen and higher androgens after menopause. The hair follicles become smaller and smaller until they no longer produce hairs.
Reduced function of the cells that produce melanin (the pigment that gives our hair colour) is what causes greying.
Theresa Larkin, Associate professor of Medical Sciences, University of Wollongong
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Switchcraft – by Dr. Elaine Fox
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How do we successfully balance “a mind is like a parachute: it only works if it’s open”, with the importance of also actually having some kind of personal integrity and consistency?
Dr. Fox recommends that we focus on four key attributes:
- Mental agility
- Self-awareness
- Emotional awareness
- Situational awareness
If this sounds a little wishy-washy, it isn’t—she delineates and explains each in detail. And most importantly: how we can build and train each one.
Mental agility, for example, is not about being able to rapidly solve chess problems or “answer these riddles three”. It’s more about:
- Adaptability
- Balancing our life
- Challenging (and if appropriate, changing) our perspective
- Developing our mental competence
This sort of thing is the “meat” of the book. Meanwhile, self-awareness is more a foundational conscious knowledge of one’s own “pole star” values, while emotional awareness is a matter of identifying and understanding and accepting what we feel—anything less is self-sabotage! And situational awareness is perhaps most interesting:
Dr. Fox advocates for “trusting one’s gut feelings”. With a big caveat, though!
If we trust our gut feelings without developing their accuracy, we’re just going to go about being blindly prejudiced and often wrong. So, a whole section of the book is devoted to honing this and improving our ability to judge things as they really are—rather than as we expect.
Bottom line: this book is a great tool for not only challenging our preconceptions about how we think, but giving us the resources to be adaptable and resilient without sacrificing integrity.
Click here to check out Switchcraft on Amazon and level up your thinking!
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Water Fluoridation, Atheroma, & More
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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 watched a documentary recently on Fluoride in our drinking water & the dangers of it. Why are we poisoning our water?❞
This is a great question, and it certainly is controversial. It sounds like the documentary you watched was predominantly or entirely negative, but there’s a lot of science to back both sides of this, and it’s not even that the science is contradictory (it’s not). It’s that what differs is people’s opinions about whether benefiting one thing is worth creating a risk to another, and that means looking at:
- What is the risk associated with taking no action (error of omission)?
- What is the risk associated with taking an action (error of commission)?
The whole topic is worth a main feature, but to summarize a few key points:
- Water fluoridation is considered good for the prevention of dental cavities
- Water fluoridation aims to deliver fluoride and doses far below dangerous levels
- This requires working on consumer averages, though
- ”Where do we put the safety margins?” is to some extent a subjective question, in terms of trading off one aspect of health for another
- Too much fluoride can also be bad for the teeth (at least cosmetically, creating little white* spots)
- Detractors of fluoride tend to mostly be worried about neurological harm
- However, the doses in public water supplies are almost certainly far below the levels required to cause this harm.
- That said, again this is working on consumer averages, though.
- However, the doses in public water supplies are almost certainly far below the levels required to cause this harm.
- A good guide is: watch your teeth! Those white* spots will be “the canary in the coal mine” of more serious harm that could potentially come from higher levels due to overconsumption of fluorine.
*Teeth are not supposed to be pure white. The “Hollywood smile” is a lie. Teeth are supposed to be a slightly off-white, ivory color. Anything whiter than that is adding something else that shouldn’t be there, or stripping something off that should be there.
❝How does your diet change clean out your arteries of the bad cholesterol?❞
There’s good news and bad news here, and they can both be delivered with a one-word reply:
Slowly.
Or rather: what’s being cleaned out is mostly not the LDL (bad) cholesterol, but rather, the result of that.
When our diet is bad for cardiovascular health, our arteries get fatty deposits on their walls. Cholesterol gets stuck here too, but that’s not the main physical problem.
Our body’s natural defenses come into action and try to clean it up, but they (for example macrophages, a kind of white blood cell that consumes invaders and then dies, before being recycled by the next part of the system) often get stuck and become part of the buildup (called atheroma), which can lead to atherosclerosis and (if calcium levels are high) hardening of the arteries, which is the worst end of this.
This can then require medical attention, precisely because the body can’t remove it very well—especially if you are still maintaining a heart-unhealthy diet, thus continuing to add to the mess.
However, if it is not too bad yet, yes, a dietary change alone will reverse this process. Without new material being added to the arterial walls, the body’s continual process of rejuvenation will eventually fix it, given time (free from things making it worse) and resources.
In fact, your arteries can be one of the quickest places for your body to make something better or worse, because the blood is the means by which the body moves most things (good or bad) around the body.
All the more reason to take extra care of it, since everything else depends on it!
You might also like our previous main feature:
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Plant-Based Healthy Cream Cheese
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Cream cheese is a delicious food, and having a plant-based diet isn’t a reason to miss out. Here we have a protein-forward nuts-based cream cheese that we’re sure you’ll love (unless you’re allergic to nuts, in which case, maybe skip this one).
You will need
- 1½ cups raw cashews, soaked in warm water and then drained
- ½ cup water
- ½ cup coconut cream
- Juice of ½ lemon
- 3 tbsp nutritional yeast
- ½ tsp onion powder
- ½ tsp garlic powder
- ½ tsp black pepper
- ½ tsp cayenne pepper
- ¼ tsp MSG, or ½ tsp low-sodium salt
- Optional: ⅓ cup fresh basil
Method
(we suggest you read everything at least once before doing anything)
1) Blend all of the ingredients until creamy.
2) Optional: leave on the countertop, covered, for 1–2 hours, if you want a more fermented (effectively: cheesy) taste.
3) Refrigerate, ideally overnight, before serving. Serving on bagels is a classic, but you can also enjoy with the Healthy Homemade Flatbreads we made yesterday
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Pistachios vs Cashews – Which is Healthier? ← Pistachios actually won here, but cashews are also great and are better (from a culinary perspective) for making cream cheese
- Why You Should Diversify Your Nuts!
- Our Top 5 Spices: How Much Is Enough For Benefits?
Take care!
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Unlock Your Menopause Type – by Dr. Heather Hirsch
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We featured Dr. Hirsch before, here, and mentioned this book which, at the time, we had not yet reviewed. So, here it is:
What sets this apart from a lot of menopause books is that there’s a lot less “eat these foods and your body will magically stop exhibiting symptoms of menopause” and a lot more clinical observations and then evidence-based recommendations.
Which is not to say don’t eat broccoli and almonds; by all means, they’re great foods and contain valuable nutrients that will help. But it is to say that if your doctor’s prescription is just broccoli and almonds, maybe have those as a snack while you’re looking for a second opinion.
Dr. Hirsch goes through various “menopause types”, but it’s not so much “astrology for gynecologists” and more “here are clusters of menopause symptoms set against timeline of presentation, and they can be categorized into six main ways that between them, cover pretty much all my patients, which have been many”.
So if you, dear reader, are menopausal (including peri- or post-), then the chances are very good that you will see yourself in one of those six sets.
She then goes about how to prioritize relief and safety, and personalize a treatment plan, and maintain the best menopausal care for you, going forward.
The style is easy-reading pop-science, punctuated by clinical science and 35 pages of references. She’s also, unlike a lot of authors in the genre, manifestly not invested in being a celebrity or making a personality cult out of her recommendations; she’s happy to stick to the science and put out good advice.
Bottom line: if you or someone you love is menopausal (including peri- or post-), this is a top-tier book.
Click here to check out Unlock Your Menopause Type, and get the best care for you!
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