The Brain As A Work-In-Progress
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And The Brain Goes Marching On!
In Tuesday’s newsletter, we asked you “when does the human brain stop developing?” and got the above-depicted, below-described, set of responses:
- About 64% of people said “Never”
- About 16% of people said “25 years”
- About 9% of people said “65 years”
- About 5% of people said “13 years”
- About 3% of people said “18 years”
- About 3% of people said “45 years”
Some thoughts, before we get into the science:
An alternative wording for the original question was “when does the human brain finish developing”; the meaning is the same but the feeling is slightly different:
- “When does the human brain stop developing?” focuses attention on the idea of cessation, and will skew responses to later ages
- When does the human brain finish developing?” focuses on attention on a kind of “is it done yet?” and will skew responses to earlier ages
Ultimately, since we had to chose one word or another, we picked the shortest one, but it would have been interesting if we could have done an A/B test, and asked half one way, and half the other way!
Why we picked those ages
We picked those ages as poll options for reasons people might be drawn to them:
- 13 years: in English-speaking cultures, an important milestone of entering adolescence (note that the concept of a “teenager” is not precisely universal as most languages do not have “-teen” numbers in the same way; the concept of “adolescent” may thus be tied to other milestones)
- 18 years: age of legal majority in N. America and many other places
- 25 years: age popularly believed to be when the brain is finished developing, due to a study that we’ll talk about shortly (we guess that’s why there’s a spike in our results for this, too!)
- 45 years: age where many midlife hormonal changes occur, and many professionals are considered to have peaked in competence and start looking towards retirement
- 65 years: age considered “senior” in much of N. America and many other places, as well as the cut-off and/or starting point for a lot of medical research
Notice, therefore, how a lot of things are coming from places they really shouldn’t. For example, because there are many studies saying “n% of people over 65 get Alzheimer’s” or “n% of people over 65 get age-related cognitive decline”, etc, 65 becomes the age where we start expecting this—because of an arbitrary human choice of where to draw the cut-off for the study enrollment!
Similarly, we may look at common ages of legal majority, or retirement pensions, and assume “well it must be for a good reason”, and dear reader, those reasons are more often economically motivated than they are biologically reasoned.
So, what does the science say?
Our brains are never finished developing: True or False?
True! If we define “finished developing” as “we cease doing neurogenesis and neuroplasticity is no longer in effect”.
Glossary:
- Neurogenesis: the process of creating new brain cells
- Neuroplasticity: the process of the brain adapting to changes by essentially rebuilding itself to suit our perceived current needs
We say “perceived” because sometimes neuroplasticity can do very unhelpful things to us (e.g: psychological trauma, or even just bad habits), but on a biological level, it is always doing its best to serve our overall success as an organism.
For a long time it was thought that we don’t do neurogenesis at all as adults, but this was found to be untrue:
How To Grow New Brain Cells (At Any Age)
Summary of conclusions of the above: we’re all growing new brain cells at every age, even if we be in our 80s and with Alzheimer’s disease, but there are things we can do to enhance our neurogenic potential along the way.
Neuroplasticity will always be somewhat enhanced by neurogenesis (after all, new neurons get given jobs to do), and we reviewed a great book about the marvels of neuroplasticity including in older age:
Our brains are still developing up to the age of 25: True or False?
True! And then it keeps on developing after that, too. Now this is abundantly obvious considering what we just talked about, but see what a difference the phrasing makes? Now it makes it sound like it stops at 25, which this statement doesn’t claim at all—it only speaks for the time up to that age.
A lot of the popular press about “the brain isn’t fully mature until the age of 25” stems from a 2006 study that found:
❝For instance, frontal gray matter volume peaks at about age 11.0 years in girls and 12.1 years in boys, whereas temporal gray matter volume peaks at about age at 16.7 years in girls and 16.2 years in boys. The dorsal lateral prefrontal cortex, important for controlling impulses, is among the latest brain regions to mature without reaching adult dimensions until the early 20s.❞
Source: Structural Magnetic Resonance Imaging of the Adolescent Brain
There are several things to note here:
- The above statement is talking about the physical size of the brain growing
- Nowhere does he say “and stops developing at 25”
However… The study only looked at brains up to the age of 25. After that, they stopped looking, because the study was about “the adolescent brain” so there has to be a cut-off somewhere, and that was the cut-off they chose.
This is the equivalent of saying “it didn’t stop raining until four o’clock” when the reality is that four o’clock is simply when you gave up on checking.
The study didn’t misrepresent this, by the way, but the popular press did!
Another 2012 study looked at various metrics of brain development, and found:
- Synapse overproduction into the teens
- Cortex pruning into the late 20s
- Prefrontal pruning into middle age at least (they stopped looking)
- Myelination beyond middle age (they stopped looking)
Source: Experience and the developing prefrontal cortex ← check out figure 1, and make sure you’re looking at the human data not the rat data
So how’s the most recent research looking?
Here’s a 2022 study that looked at 123,984 brain scans spanning the age range from mid-gestation to 100 postnatal years, and as you can see from its own figure 1… Most (if not all) brain-things keep growing for life, even though most slow down at some point, they don’t stop:
Brain charts for the human lifespan ← check out figure 1; don’t get too excited about the ventricular volume column as that is basically “brain that isn’t being a brain”. Do get excited about the rest, though!
Want to know how not to get caught out by science being misrepresented by the popular press? Check out:
How Science News Outlets Can Lie To You (Yes, Even If They Cite Studies!)
Take care!
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The Sugary Food That Lowers Blood Sugars
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It’s Q&A Day at 10almonds!
Have a question or a request? We love to hear from you!
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
❝Loved the article on goji berries! I read they are good for blood sugars, is that true despite the sugar content?❞
Most berries are! Fruits that are high in polyphenols (even if they’re high in sugar), like berries, have a considerable net positive impact on glycemic health:
- Polyphenols and Glycemic Control
- Polyphenols and their effects on diabetes management: A review
- Dietary polyphenols as antidiabetic agents: Advances and opportunities
And more specifically:
Dietary berries, insulin resistance and type 2 diabetes: an overview of human feeding trials
Read more: Which Sugars Are Healthier, And Which Are Just The Same?
As for goji berries specifically, they’re very high indeed in polyphenols, and also have a hypoglycemic effect, i.e., they lower blood sugar levels (and as a bonus, increases HDL (“good” cholesterol) levels too, but that’s not the topic here):
❝The results of our study indicated a remarkable protective effect of LBP in patients with type 2 diabetes. Serum glucose was found to be significantly decreased and insulinogenic index increased during OMTT after 3 months administration of LBP. LBP also increased HDL levels in patients with type 2 diabetes. It showed more obvious hypoglycemic efficacy for those people who did not take any hypoglycemic medicine compared to patients taking hypoglycemic medicines. This study showed LBP to be a good potential treatment aided-agent for type 2 diabetes.❞
- LBP = Lycium barbarum polysaccharide, i.e. polysaccharide in/from goji berries
- OMTT = Oral metabolic tolerance test, a test of how well the blood sugars avoid spiking after a meal
For more about goji berries (and also where to get them), for reference our previous article is at:
Goji Berries: Which Benefits Do They Really Have?
Take care!
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What happens in my brain when I get a migraine? And what medications can I use to treat it?
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Migraine is many things, but one thing it’s not is “just a headache”.
“Migraine” comes from the Greek word “hemicrania”, referring to the common experience of migraine being predominantly one-sided.
Some people experience an “aura” preceding the headache phase – usually a visual or sensory experience that evolves over five to 60 minutes. Auras can also involve other domains such as language, smell and limb function.
Migraine is a disease with a huge personal and societal impact. Most people cannot function at their usual level during a migraine, and anticipation of the next attack can affect productivity, relationships and a person’s mental health.
Francisco Gonzelez/Unsplash What’s happening in my brain?
The biological basis of migraine is complex, and varies according to the phase of the migraine. Put simply:
The earliest phase is called the prodrome. This is associated with activation of a part of the brain called the hypothalamus which is thought to contribute to many symptoms such as nausea, changes in appetite and blurred vision.
The hypothalamus is shown here in red. Blamb/Shutterstock Next is the aura phase, when a wave of neurochemical changes occur across the surface of the brain (the cortex) at a rate of 3–4 millimetres per minute. This explains how usually a person’s aura progresses over time. People often experience sensory disturbances such as flashes of light or tingling in their face or hands.
In the headache phase, the trigeminal nerve system is activated. This gives sensation to one side of the face, head and upper neck, leading to release of proteins such as CGRP (calcitonin gene-related peptide). This causes inflammation and dilation of blood vessels, which is the basis for the severe throbbing pain associated with the headache.
Finally, the postdromal phase occurs after the headache resolves and commonly involves changes in mood and energy.
What can you do about the acute attack?
A useful way to conceive of migraine treatment is to compare putting out campfires with bushfires. Medications are much more successful when applied at the earliest opportunity (the campfire). When the attack is fully evolved (into a bushfire), medications have a much more modest effect.
Aspirin
For people with mild migraine, non-specific anti-inflammatory medications such as high-dose aspirin, or standard dose non-steroidal medications (NSAIDS) can be very helpful. Their effectiveness is often enhanced with the use of an anti-nausea medication.
Triptans
For moderate to severe attacks, the mainstay of treatment is a class of medications called “triptans”. These act by reducing blood vessel dilation and reducing the release of inflammatory chemicals.
Triptans vary by their route of administration (tablets, wafers, injections, nasal sprays) and by their time to onset and duration of action.
The choice of a triptan depends on many factors including whether nausea and vomiting is prominent (consider a dissolving wafer or an injection) or patient tolerability (consider choosing one with a slower onset and offset of action).
As triptans constrict blood vessels, they should be used with caution (or not used) in patients with known heart disease or previous stroke.
Triptans should be used cautiously in patients with heart disease. CDC/Unsplash Gepants
Some medications that block or modulate the release of CGRP, which are used for migraine prevention (which we’ll discuss in more detail below), also have evidence of benefit in treating the acute attack. This class of medication is known as the “gepants”.
Gepants come in the form of injectable proteins (monoclonal antibodies, used for migraine prevention) or as oral medication (for example, rimegepant) for the acute attack when a person has not responded adequately to previous trials of several triptans or is intolerant of them.
They do not cause blood vessel constriction and can be used in patients with heart disease or previous stroke.
Ditans
Another class of medication, the “ditans” (for example, lasmiditan) have been approved overseas for the acute treatment of migraine. Ditans work through changing a form of serotonin receptor involved in the brain chemical changes associated with the acute attack.
However, neither the gepants nor the ditans are available through the Pharmaceutical Benefits Scheme (PBS) for the acute attack, so users must pay out-of-pocket, at a cost of approximately A$300 for eight wafers.
What about preventing migraines?
The first step is to see if lifestyle changes can reduce migraine frequency. This can include improving sleep habits, routine meal schedules, regular exercise, limiting caffeine intake and avoiding triggers such as stress or alcohol.
Despite these efforts, many people continue to have frequent migraines that can’t be managed by acute therapies alone. The choice of when to start preventive treatment varies for each person and how inclined they are to taking regular medication. Those who suffer disabling symptoms or experience more than a few migraines a month benefit the most from starting preventives.
Some people will take medicines to prevent migraines. Tbel Abuseridze/Unsplash Almost all migraine preventives have existing roles in treating other medical conditions, and the physician would commonly recommend drugs that can also help manage any pre-existing conditions. First-line preventives include:
- tablets that lower blood pressure (candesartan, metoprolol, propranolol)
- antidepressants (amitriptyline, venlafaxine)
- anticonvulsants (sodium valproate, topiramate).
Some people have none of these other conditions and can safely start medications for migraine prophylaxis alone.
For all migraine preventives, a key principle is starting at a low dose and increasing gradually. This approach makes them more tolerable and it’s often several weeks or months until an effective dose (usually 2- to 3-times the starting dose) is reached.
It is rare for noticeable benefits to be seen immediately, but with time these drugs typically reduce migraine frequency by 50% or more.
‘Nothing works for me!’
In people who didn’t see any effect of (or couldn’t tolerate) first-line preventives, new medications have been available on the PBS since 2020. These medications block the action of CGRP.
The most common PBS-listed anti-CGRP medications are injectable proteins called monoclonal antibodies (for example, galcanezumab and fremanezumab), and are self-administered by monthly injections.
These drugs have quickly become a game-changer for those with intractable migraines. The convenience of these injectables contrast with botulinum toxin injections (also effective and PBS-listed for chronic migraine) which must be administered by a trained specialist.
Up to half of adolescents and one-third of young adults are needle-phobic. If this includes you, tablet-form CGRP antagonists for migraine prevention are hopefully not far away.
Data over the past five years suggest anti-CGRP medications are safe, effective and at least as well tolerated as traditional preventives.
Nonetheless, these are used only after a number of cheaper and more readily available first-line treatments (all which have decades of safety data) have failed, and this also a criterion for their use under the PBS.
Mark Slee, Associate Professor, Clinical Academic Neurologist, Flinders University and Anthony Khoo, Lecturer, Flinders University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Wasting Your Vitamins?
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Are you flushing away your vitamins?
Most likely…but you don’t have to.
We all know what a wasteful expense supplements can sometimes be, but you can optimise your intake to get more bang for your buck!
Top Tips for Getting Your Money’s Worth:
- Liquids are better than tablets—the body can’t absorb nutrients from tablets anywhere as easily as it can from liquids, with some saying as low as a 50% absorption rate for tablets, so if your supplement can come in drinkable form, take it that way!
- Capsules are better than tablets—capsules, depending on the kind, contain either a powder (true capsules) or a liquid (softgels). Once the capsule/softgel is broken down in the stomach, it releases its contents, which will now be absorbed as though you took it as a drink.
- Stay hydrated—on that note, your body can only make use of nutrients that it can easily transport, and if you’re dehydrated, the process is sluggish! Having a big glass of water with your supplements will go a long way to helping your body get them where they’re needed.
- Take with black pepper—studies disagree on exactly how much black pepper improves absorption of nutrients. Some say it improves it by 50%, others say as much as 7x better. The truth is probably that it varies from one nutrient to the next, but what is (almost) universally accepted is that black pepper helps you absorb many nutrients you take orally.
- Take with a meal—bonus if you seasoned it with black pepper! But also: many nutrients are best absorbed alongside food, and many are specifically fat-soluble (so you want to take a little fat around the same time for maximum absorption)
- Consider split doses—a lot of nutrients are best absorbed when spread out a bit. Why? Your body can often only absorb so much at once, and what it couldn’t absorb can, depending on the nutrient, pass right through you. So better to space out the doses—breakfast and dinner make for great times to take them.
- Consider cycling—no, not the two-wheeled kind, though feel free to do that too! What cycling means when it comes to supplements is to understand that your body can build a tolerance to some supplements, so you’ll get gradually less effect for the same dose. Combat this by scheduling a break—five days on, two days off is a common schedule—allowing your body to optimise itself in the process!
- Check Medications—and, as is always safe, make sure you check whether any medications you take can interrupt your supplement absorption!
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Strong At Every Age: 15 Habits To Level Up Your Health & Fitness
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Not every increase in health and fitness needs to look like a training montage from the “Rocky” movies!
Making progress every day
We’ll not keep the 15 habits a secret; they are:
- Follow the one-minute rule: commit to just one minute of action—this makes starting easier, and often you’ll end up doing more once you’ve got started.
- Make the habit exciting: add fun elements to make the habit more enjoyable, like using new gear or accessories.
- Do it first: prioritize new habits by doing them early in the day to ensure they get done.
- Share the love: pair new habits with activities you already enjoy, where practical, to do “temptation bundling”.
- Embrace the uncomfortable: get used to discomfort daily to grow and build resilience for bigger changes.
- Do as little as possible: start small with habits, to minimize resistance and focus on consistency.
- Think how to be lazy: simplify processes and use shortcuts; there are no extra prizes for it having been difficult!
- Make the appointment: schedule habits with set dates and times, to increase accountability.
- Let habits evolve: adapt habits to fit current circumstances; that way you can still stay consistent over time.
- Plan ahead: prepare in advance to avoid setbacks—what could stop you from succeeding, and how can you pre-empt that?
- Pause to reflect: regularly evaluate what works and what doesn’t, to adjust and improve.
- Shut off your brain: avoid overthinking and start taking action now, not later, to build momentum.
- Question and learn: stay curious and open to learning, or else you will plateau quickly!
- Ask why: understand the deeper reasons behind any resistance, and make clear for yourself the value of the habit.
- Love your failures: embrace any setbacks as learning opportunities and, as such, stepping stones to success.
For more on all of each of these, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
How To Really Pick Up (And Keep!) Those Habits
Take care!
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Oat Milk vs Almond Milk – Which is Healthier?
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Our Verdict
When comparing oat milk to almond milk, we picked the almond milk.
Why?
This one’s quite straightforward, and no, it’s not just our bias for almonds
Rather, almonds contain a lot more vitamins and minerals, all of which usually make it into the milk.
Oat milk is still a fine choice though, and has a very high soluble fiber content, which is great for your heart.
Just make sure you get versions without added sugar or other unpleasantries! You can always make your own at home, too.
You can read a bit more about the pros and cons of various plant milks here:
Enjoy!
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Caffeine: Cognitive Enhancer Or Brain-Wrecker?
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The Two Sides Of Caffeine
We asked you for your health-related opinions on caffeine itself, not necessarily the coffee, tea, energy drinks, etc that might contain it.
We have, by the way previously written about the health effects of coffee and tea specifically:
As for our question about caffeine itself, though, we got the above-depicted, below-described, set of results:
- About 59% said “caffeine is a safe stimulant and cognitive enhancer”
- About 31% said “caffeine is a moderately safe recreational drug”
- About 8% said “caffeine’s addictive properties make it de facto bad”
- One (1) person said “caffeine will leave you a trembling exhausted wreck”
But what does the science say?
Caffeine is addictive: True or False?
True, though one will find occasional academics quibbling the definition. Most of the studies into the mechanisms of caffeine addiction have been conducted on rats, but human studies exist too and caffeine is generally considered addictive for humans, for example:
See also:
Notwithstanding its addictive status, caffeine is otherwise safe: True or False?
True-ish, for most people. Some people with heart conditions or a hypersensitivity to caffeine may find it is not safe for them at all, and for the rest of us, the dose makes the poison. For example:
❝Can too much caffeine kill you? Although quite rare, caffeine can be fatal in cases of overdose; such circumstances are generally not applicable to healthy individuals who typically consume caffeine via beverages such as tea or coffee.❞
this paper, by the way, also includes a good example of academics quibbling the definition of addiction!
Caffeine is a cognitive enhancer: True or False?
True, but only in the case of occasional use. If you are using it all the time, your physiology will normalize it and you will require caffeine in order to function at your normal level. To attain higher than that, once addicted to caffeine, would now require something else.
Read more: Caffeine: benefits and drawbacks for technical performance
Caffeine will leave you a trembling exhausted wreck: True or False?
True or False depending on usage:
- The famously moderate 3–5 cups per day will not, for most people, cause any such problems.
- Using/abusing it to make up for lost sleep (or some other source of fatigue, such as physical exhaustion from exertion), however, is much more likely to run into problems.
In the latter case, caffeine really is the “payday loan” of energy! It’ll give you an adrenal boost now (in return, you must suffer the adrenal dumping later, along with lost energy expended in the adrenaline surge), and also, the tiredness that you thought was gone, was just caffeine’s adenosine-blocking activities temporarily preventing you from being able to perceive the tiredness. So you’ll have to pay that back later, with interest, because of the extra time/exertion too.
Want to make caffeine a little more gentle on your system?
Taking l-theanine alongside caffeine can ameliorate some of caffeine’s less wonderful effects—and as a bonus, l-theanine has some nifty benefits of its own, too:
Enjoy!
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