Daily Activity Levels & The Measurable Difference They Make To Brain Health
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Most studies into the difference that exercise makes to cognitive decline are retrospective, i.e. they look backwards in time, asking participants what their exercise habits were like in the past [so many] years, and tallying that against their cognitive health in the present.
Some studies are interventional, and those are most often 3, 6, or 12 months, depending on funding. In those cases, they make a hypothesis (e.g. this intervention will boost this measure of brain health) and then test it.
However, humans aren’t generally great at making short term decisions for long term gains. In other words: if it’s rainy out, or you’re a little pushed for time, you’re likely to take the car over walking regardless of what data point this adjusts in an overarching pattern that will affect your brain’s amyloid-β clean-up rates in 5–20 years time.
Nine days
The study we’re going to look at today was a 9-day observational study, using smartphone-based tracking with check-ins every 3½ hours, with participants reporting their physical activity as light, moderate, or intense (these terms were defined and exemplified, so that everyone involved was singing from the same songsheet in terms of what activities constitute what intensity).
The sample size was reasonable (n=204) and was generally heterogenous sample (i.e. varied in terms of sex, racial background, and fitness level) of New Yorkers aged 40–65.
So, the input variable was activity level, and the output variable was cognitive fitness.
As to how they measured the output, two brain games assessed:
- cognitive processing speed, and
- working memory (a proxy for executive function).
What they found:
- participants active within the last 3½ hours had faster processing speed, equivalent to being four years younger
- response times in the working memory (for: executive function) task reflected similar processing speed improvements, for participants active in the last 3½ hours
And, which is important to note,
❝This benefit was observed regardless of whether the activities they reported were higher intensity (e.g., running/jogging) or lower intensity (e.g., walking, chores).❞
Source: Cognitive Health Benefits of Everyday Physical Activity in a Diverse Sample of Middle-Aged Adults
Practical take-away:
Move more often! At least every couple of hours (when not sleeping)!
The benefits will benefit you in the now, as well as down the line.
See also:
The Doctor Who Wants Us To Exercise Less, & Move More
and, for that matter:
Do You Love To Go To The Gym? No? Enjoy These “No-Exercise Exercises”!
Take care!
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Delicious Daily Daal
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You’re not obliged to eat this every day, but you might want to. The reason we called this one this, is because it’s a super simple recipe (don’t be put off by the long ingredients list; it’s mostly spices making it look long) which, after you’ve done it a couple of times, you could practically do it in your sleep quickly and easily.
The name “lentil daal” is a bit like “naan bread”—a redundant tautology repeated more than once unnecessarily, but it helps for international clarity. The dish is usually served with naan, by the way, and rice. We don’t have room for those today, maybe we’ll do them another day; for now, you can just cook rice how you normally do, and buy naan if necessary.
Writer’s note: I love strong flavors; many people don’t. For this reason I’m going to give a “basic” version. Please feel free to multiply the spices if you feel so inclined. Where I give “one teaspoon” of a spice below, I’d use a tablespoon at home. Chili peppers can vary in heat a lot even within the same type, so what I do for any given batch is taste one (raw), judge the heat, and use an appropriate number of peppers accordingly. If you don’t want to do that, I suggest just guessing low (as per the instructions below) and if you find at the end you want more heat, you can always stir in a little hot sauce. I know that sounds heretical, but at the end of the day, the primary goal of cooking is to have the meal you want at the end of it.
You will need
- 1 1/2 cups red lentils
- 1 large onion, chopped
- 1 large bulb garlic, minced
- 1 oz ginger, grated
- 2 hot peppers (e.g. serrano), chopped
- 1 tsp ground cumin
- 1 tsp ground coriander
- 1 tsp ground turmeric
- 1 tsp garam masala (this is also ground, but it doesn’t come any other way)
- 1 tsp chili flakes (omit if you’re not a fan of heat)
- 2 tsp cracked black pepper
- 1 tsp salt ← I wouldn’t recommend multiplying this one unless later, to taste. In fact, instead of 1 tsp salt I use 2 tsp MSG, which has less sodium than 1 tsp salt. But “1 tsp salt” is the “easy to find in the store” version.
- 2 large or 3 small tomatoes, chopped (or 1 can chopped tomatoes)
- 2 shallots, thinly sliced
- 1 tsp cumin seeds
- 1 tsp mustard seeds
- 1 tsp coriander seeds
- 1 tsp black peppercorns
- 1 lime
- 1/2 cup fresh cilantro, or if you have the “that tastes like soap” gene, parsley, chopped
- Coconut oil for cooking (if you don’t like coconut, consider springing for avocado oil—if you use olive oil, it’ll add an olivey taste which changes the dish a lot; not inherently bad, but it feels a lot less like traditional daal; seed oils are less healthy and we don’t recommend them; ghee is a traditional option and not bad in moderation, but not as healthy as the oils we mentioned first)
- Water for cooking the lentils
Method
(we suggest you read everything at least once before doing anything)
1) In a saucepan, boil water and add the lentils; let them simmer while doing the next things.
2) Sauté the onions until translucent. This should only take a few minutes.
3) Add the garlic, ginger, and hot peppers, and keep stirring for another couple of minutes.
4) Add the ground spices (cumin, coriander, turmeric, garam masala) chili flakes, and cracked black pepper, as well as the salt or MSG if using (not both), and stir them in quickly but thoroughly.
For the next step, you may need to transfer to larger pan if your sauté pan isn’t big enough to take the volume; if so, that’s fine, the sauté has done its job and can have a rest now. If your sauté pan is big enough, just carry on in the same pan; this is perfect.
5) Add the lentils with the water you cooked them in (there might not be much water left now, as the lentils will have absorbed a lot of it; this is fine) as well as the chopped tomatoes.
6) Simmer until it has the consistency of a very thick sauce (you can add a splash more water here and there if it seems to need more). In the West it’s common to serve lentils “al dente”, but in the East it’s usual to (for dishes like this) cook them until they start to
7) Add the juice of at least 1/2 of your lime, or the whole lime if you feel so inclined.
8) In a pre-heated skillet, flash-fry the sliced shallots and the seeds (cumin, coriander, mustard, black peppercorns) at the hottest temperature you can muster. Don’t worry if the oil smokes; we’re only going to be at this tadka-making stage for a moment and nothing will stick provided you keep it moving. When the seeds start popping, it’s ready. Add it all to the big pan and stir in.
9) Add the cilantro-or-parsley garnish once you’re ready to serve.
Enjoy!
Learn more
For those interested in some of the science of what we have going on today:
- Why You’re Probably Not Getting Enough Fiber (And How To Fix It)
- How Much Spice Is Right?
- Tasty Polyphenols
Take care!
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A Deeper Dive Into Seaweed
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We wrote briefly about nori yesterday, when we compared it with well-known superfood spirulina. In nutritional terms, it blew spirulina out of the water:
Spirulina vs Nori – Which Is Healthier?
We also previously touched on it here:
21% Stronger Bones in a Year at 62? Yes, It’s Possible (No Calcium Supplements Needed!) ← nori was an important part of the diet enjoyed here
What is nori?
Nori is a seaweed, but that can mean lots of different things. In nori’s case, it’s an aggregate of several kinds of red algae that clump together in the sea.
When dried and/or toasted (which processes improve* the nutritional value rather than diminishing it, by the way), it looks dark green or dark purple to black in color.
*Effects of pan- and air fryer-roasting on volatile and umami compounds and antioxidant activity of dried laver (Porphyra dentata) ← this is nori, by another name
If you enjoy sushi, nori is the dark flat sheety stuff that other things are often wrapped in.
The plant that has animal nutrients
As established in the head-to-head we linked above, nori is a nutritional powerhouse. But not only is it very full of the perhaps-expected vitamins and minerals, it also contains:
Omega-3 fatty acids, including EPA, which plants do not normally have (plants usually have just ALA, which the body can convert into other forms including EPA). While ALA is versatile, having EPA in food saves the body the job of converting it, and thus makes it more readily bioavailable. For more on the benefits of this, see:
What Omega-3 Fatty Acids Really Do For Us
Iodine, which land plants don’t generally have, but seaweed usually does. However, nori contains less iodine than other kinds of seaweed, which is (counterintuitively) good, since other kinds of seaweed often contain megadoses that go too far the other way and can cause different health problems.
- Recommended daily amount of iodine: 150µg ← note that’s micrograms, not milligrams
- One 10g serving of dried nori contains: 232µg ← this is good
- Tolerable daily upper limit of iodine: 1,100µg (i.e: 1.1mg)
- One 10g serving of dried kombu (kelp) contains: 13,270µg (i.e: 13.3mg) ← this is far too much; not good!
So: a portion of nori puts us into the healthiest spot of the range, whereas a portion of another example seaweed would put us nearly 13x over the tolerable upper limit.
For why this matters, see:
- 8 Signs Of Iodine Deficiency You Might Not Expect
- Foods For Managing Hypothyroidism (incl. Hashimoto’s)
- Eat To Beat Hyperthyroidism!
As you might note from the mentions of both hypo- and hyperthyroidism, (which are exacerbated by too little and too much iodine, respectively) hitting the iodine sweet spot is important, and nori is a great way to do that.
Vitamin B12, again not usually found in plants (most vegans supplement, often with nutritional yeast, which is technically neither an animal nor a plant). However, nori scores even higher:
Vitamin B12-Containing Plant Food Sources for Vegetarians
Beyond nutrients
Nori is also one of the few foods that actually live up the principle of a “detox diet”, as it can help remove toxins such as dioxins:
Detox diets for toxin elimination and weight management: a critical review of the evidence
It’s also been…
❝revealed to have anti-aging, anti-cancer, anti-coagulant, anti-inflammatory, anti-microbial, anti-oxidant, anti-diabetic, anti-Alzheimer and anti-tuberculose activities.❞
~ Dr. Şükran Çakir Arica et al.
Read: A study on the rich compounds and potential benefits of algae: A review
(for this to make sense you will need to remember that nori is, as we mentioned, an aggregate of diverse red algae species; in that paper, you can scroll down to Table 1, and see which species has which qualities. Anything whose name starts with “Porphyra” or “Porphridum” is found in nori)
Is it safe?
Usually! There are two potential safety issues:
- Seaweed can, while it’s busy absorbing valuable minerals from the sea, also absorb heavy metals if there are such pollutants in the region. For this reason, it is good to buy a product with trusted certifications, such that it will have been tested for such along the way.
- Seaweed can, while it’s busy absorbing things plants don’t usually have from the sea, also absorb allergens from almost-equally-small crustaceans. So if you have a seafood allergy, seaweed could potentially trigger that.
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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How To Gain Weight (Healthily!)
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What Do You Have To Gain?
We have previously promised a three-part series about changing one’s weight:
- Losing weight (specifically, losing fat)
- Gaining weight (specifically, gaining muscle)
- Gaining weight (specifically, gaining fat)
There will be, however, no need for a “losing muscle” article, because (even though sometimes a person might have some reason to want to do this), it’s really just a case of “those things we said for gaining muscle? Don’t do those and the muscle will atrophy naturally”.
Here’s our first article: How To Lose Weight (Healthily!)
While some people will want to lose fat, please do be aware that the association between weight loss and good health is not nearly so strong as the weight loss industry would have you believe:
And, while BMI is not a useful measure of health in general, it’s worth noting that over the age of 65, a BMI of 27 (which is in the high end of “overweight”, without being obese) is associated with the lowest all-cause mortality:
BMI and all-cause mortality in older adults: a meta-analysis
Here was our second article: How To Build Muscle (Healthily!)
And now, it’s time for the last part, which yes, is also something that some people want/need to do (healthily!), and want/need help with that.
How to gain fat, healthily
Fat gets a bad press, but when it comes to health, we would die without it.
Even in the case of having excess fat, the fat itself is not generally the problem, so much as comorbid metabolic issues that are often caused by the same things as the excess fat.
So, how to gain fat healthily?
- Obvious but potentially dangerously misleading answer: “in moderation”
- More useful answer: “carefully”
Because, you can “in moderation” put on less than one pound per week for a few years and be in very bad health by the end of it. So how does this “carefully” work any differently to “in moderation”?
The key is in how we store the fat
Not merely where we store it (though that’ll follow from the “how”), but specifically: how we store it.
- When we consume energy from food in excess of our immediate survival needs, our body stores what it can. This is good!
- When our body is receiving energy from food faster than it can physically process it to store it healthily, it will start shoving it wherever it can instead. This is bad!
This is the physiological equivalent of the difference between tidying a room carefully, and cramming everything into one cupboard in 30 seconds just to get it out of sight.
So, you do need to consume calories yes, but you need to consume them in a way your body can take its time about storing them.
We’ve written before about the science of this, so we’ll share some links to that in a moment, but first, here are the practical tips:
- Do not drink your calories. Drinking calories tends to be the equivalent of injecting sugars directly into your veins, in terms of how quickly it gets received.
- See also: How To Unfatty A Fatty Liver ← this is highly relevant, because the same process that results in unhealthy weight gain, results in liver disease, by the same mechanism (the liver gets overwhelmed).
- Eat your greens. No, they won’t provide many calories, but they are critical to your body not being overwhelmed by the arrival of sugars.
- See also: 10 Ways To Balance Blood Sugars ← the other 9 things are also helpful for not putting on fat unhealthily, so using these alongside a calorie-dense diet can result in healthy fat gain as needed
- Get more of your calories from fats than carbs. Fats will not overwhelm your body’s glycemic response in the same way that carbs will.
- Again this is about getting calories while not getting metabolic disease. See also: How To Prevent And Reverse Type Two Diabetes as the advice is the same for that, for the same reason!
- Consider going low-carb, but even if you choose not to, go for carbs with a low glycemic index instead of a high glycemic index.
- For reference, see: Glycemic Index Chart: Glycemic index and glycemic load ratings for 500+ foods
- Need healthy fats in a snack? Enjoy nuts (unless you have an allergy); they will be your best friend in this regard. As an example, a mere 1oz portion of cashew nuts has 157 calories.
- See also: Why You Should Diversify Your Nuts
- Need health fats for cooking? Enjoy olive oil, as it has one of the healthiest lipids profiles available, and is a great way to increase the calorific content of many meals.
Lastly…
Be patient, enjoy your food, and stick as best you can to the above considerations. All strength to you.
Take care!
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Eat Well With Arthritis – by Emily Johnson, with Dr. Deepak Ravindran
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Author Emily Johnson was diagnosed with arthritis in her early 20s, but it had been affecting her life since the age of 4. Suffice it to say, managing the condition has been integral to her life.
She’s written this book with not only her own accumulated knowledge, but also the input of professional experts; the book contains insights from chronic pain specialist Dr. Deepak Ravindran, and gets an additional medical thumbs-up in a foreword by rheumatologist Dr. Lauren Freid.
The recipes themselves are clear and easy, and the ingredients are not obscure. There’s information on what makes each dish anti-inflammatory, per ingredient, so if you have cause to make any substitutions, that’s useful to know.
Speaking of ingredients, the recipes are mostly plant-based (though there are some chicken/fish ones) and free from common allergens—but not all of them are, so each of those is marked appropriately.
Beyond the recipes, there are also sections on managing arthritis more generally, and information on things to get for your kitchen that can make your life with arthritis a lot easier!
Bottom line: if you have arthritis, cook for somebody with arthritis, or would just like a low-inflammation diet, then this is an excellent book for you.
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Willpower: A Muscle To Flex, Or Spoons To Conserve?
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Willpower: A Muscle To Flex, Or Spoons To Conserve?
We have previously written about motivation; this one’s not about that.
Rather, it’s about willpower itself, and especially, the maintenance of such. Which prompts the question…
Is willpower something that can be built up through practice, or something that is a finite resource that can be expended?
That depends on you—and your experiences.
- Some people believe willpower is a metaphorical “muscle” that must be exercised to be built up
- Some people believe willpower is a matter of metaphorical “spoons” that can be used up
A quick note on spoon theory: this traces its roots to Christine Miserandino’s 2003 essay about chronic illness and the management of limited energy. She details how she explained this to a friend in a practical fashion, she gave her a bunch of spoons from her kitchen, as an arbitrary unit of energy currency. These spoons would then need to be used to “pay” for tasks done; soon her friend realised that if she wanted to make it through the day, she was going to have to give more forethought to how she would “spend” her spoons, or she’d run out and be helpless (and perhaps hungry and far from home) before the day’s end. So, the kind of forethought and planning that a lot of people with chronic illnesses have to give to every day’s activities.
You can read it here: But You Don’t Look Sick? The Spoon Theory
So, why do some people believe one way, and some believe the other? It comes down to our experiences of our own willpower being built or expended. Researchers (Dr. Vanda Siber et al.) studied this, and concluded:
❝The studies support the idea that what people believe about willpower depends, at least in part, on recent experiences with tasks as being energizing or draining.❞
Source: Autonomous Goal Striving Promotes a Nonlimited Theory About Willpower
In other words, there’s a difference between going out running each morning while healthy, and doing so with (for example) lupus.
On a practical level, this translates to practicable advice:
- If something requires willpower but is energizing, this is the muscle kind! Build it.
- If something requires willpower and is draining, this is the spoons kind! Conserve it.
Read the above two bullet-points as many times as necessary to cement them into your hippocampus, because they are the most important message of today’s newsletter.
Do you tend towards the “nonlimited” belief, despite getting tired? If so, here’s why…
There is something that can continue to empower us even when we get physically fatigued, and that’s the extent to which we truly get a choice about what we’re doing. In other words, that “Autonomous” at the front of the title of the previous study, isn’t just word salad.
- If we perceive ourselves as choosing to do what we are doing, with free will and autonomy (i.e., no externally created punitive consequences), we will feel much more empowered, and that goes for our willpower too.
- If we perceive ourselves as doing what we have to (or suffer the consequences), we’ll probably do it, but we’ll find it draining, and that goes for our willpower too.
Until such a time as age-related physical and mental decline truly take us, we as humans tend to gradually accumulate autonomy in our lives. We start as literal babies, then are children with all important decisions made for us, then adolescents building our own identity and ways of doing things, then young adults launching ourselves into the world of adulthood (with mixed results), to a usually more settled middle-age that still has a lot of external stressors and responsibilities, to old age, where we’ve often most things in order, and just ourselves and perhaps our partner to consider.
Consequently…
Age differences in implicit theories about willpower: why older people endorse a nonlimited theory
…which explains why the 30-year-old middle-manager might break down and burn out and stop going to work, while an octogenarian is busy training for a marathon daily before getting back to their daily book-writing session, without fail.
One final thing…
If you need a willpower boost, have a snack*. If you need to willpower boost to avoid snacking, then plan for this in advance by finding a way to keep your blood sugars stable. Because…
The physiology of willpower: linking blood glucose to self-control
*Something that will keep your blood sugars stable, not spike them. Nuts are a great example, unless you’re allergic to such, because they have a nice balance of carbohydrates, protein, and healthy fats.
Want more on that? Read: 10 Ways To Balance Blood Sugars
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Castor Oil: All-Purpose Life-Changer, Or Snake Oil?
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As “trending” health products go, castor oil is enjoying a lot of popularity presently, lauded as a life-changing miracle-worker, and social media is abuzz with advice to put it everywhere from your eyes to your vagina.
But:
- what things does science actually say it’s good for,
- what things lack evidence, and
- what things go into the category of “wow definitely do not do that”?
We don’t have the space to go into all of its proposed uses (there are simply far too many), but we’ll examine some common ones:
To heal/improve the skin barrier
Like most oils, it’s functional as a moisturizer. In particular, its high (90%!) ricinoleic fatty acid content does indeed make it good at that, and furthermore, has properties that can help reduce skin inflammation and promote wound healing:
Bioactive polymeric formulations for wound healing ← there isn’t a conveniently quotable summary we can just grab here, but you can see the data and results, from which we can conclude:
- formulations with ricinoleic acid (such as with castor oil) performed very well for topical anti-inflammatory purposes
- they avoided the unwanted side effects associated with some other contenders
- they consistently beat other preparations in the category of wound-healing
To support hair growth and scalp health
There is no evidence that it helps. We’d love to provide a citation for this, but it’s simply not there. There’s also no evidence that it doesn’t help. For whatever reason, despite its popularity, peer-reviewed science has simply not been done for this, or if it has, it wasn’t anywhere publicly accessible.
It’s possible that if a person is suffering hair loss specifically as a result of prostaglandin D2 levels, that ricinoleic acid will inhibit the PGD2, reversing the hair loss, but even this is hypothetical so far, as the science is currently only at the step before that:
However, due to some interesting chemistry, the combination of castor oil and warm water can result in acute (and irreversible) hair felting, in other words, the strands of hair suddenly glue together to become one mass which then has to be cut off:
“Castor Oil” – The Culprit of Acute Hair Felting
👆 this is a case study, which is generally considered a low standard of evidence (compared to high-quality Randomized Controlled Trials as the highest standard of evidence), but let’s just say, this writer (hi, it’s me) isn’t risking her butt-length hair on the off-chance, and doesn’t advise you to, either. There are other hair-oils out there; argan oil is great, coconut oil is totally fine too.
As a laxative
This time, there’s a lot of evidence, and it’s even approved for this purpose by the FDA, but it can be a bit too good, insofar as taking too much can result in diarrhea and uncomfortable cramping (the cramps are a feature not a bug; the mechanism of action is stimulatory, i.e. it gets the intestines squeezing, but again, it can result in doing that too much for comfort):
Castor Oil: FDA-Approved Indications
To soothe dry eyes
While putting oil in your eyes may seem dubious, this is another one where it actually works:
❝Castor oil is deemed safe and tolerable, with strong anti-microbial, anti-inflammatory, anti-nociceptive, analgesic, antioxidant, wound healing and vasoconstrictive properties.
These can supplement deficient physiological tear film lipids, enabling enhanced lipid spreading characteristics and reducing aqueous tear evaporation.
Studies reveal that castor oil applied topically to the ocular surface has a prolonged residence time, facilitating increased tear film lipid layer thickness, stability, improved ocular surface staining and symptoms.❞
Source: Therapeutic potential of castor oil in managing blepharitis, meibomian gland dysfunction and dry eye
Against candidiasis (thrush)
We couldn’t find science for (or against) castor oil’s use against vaginal candidiasis, but here’s a study that investigated its use against oral candidiasis:
…in which castor oil was the only preparation that didn’t work against the yeast.
Summary
We left a lot unsaid today (so many proposed uses, it feels like a shame to skip them), but in few words: it’s good for skin (including wound healing) and eyes; but we’d give it a miss for hair, candidiasis, and digestive disorders.
Want to try some?
We don’t sell it, but here for your convenience is an example product on Amazon 😎
Take care!
Don’t Forget…
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