The Circadian Rhythm: Far More Than Most People Know
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The Circadian Rhythm: Far More Than Most People Know
This is Dr. Satchidananda (Satchin) Panda, the scientist behind the discovery of the blue-light sensing cell type in the retina, and the many things it affects. But, he’s discovered more…
First, what you probably know (with a little more science)
Dr. Panda discovered that melanopsin, a photopigment, is “the primary candidate for photoreceptor-mediated entrainment”.
To put that in lay terms, it’s the brain’s go-to for knowing approximately what time of day or night it is, according to how much light there is (or isn’t), and how long it has (or hasn’t) been there.
But… the brain’s “go-to” isn’t the only method. By creating mice without melanopsin, he was able to find that they still keep a circadian rhythm, even in complete darkness:
Melanopsin (Opn4) Requirement for Normal Light-Induced Circadian Phase Shifting
In other words, it was a helpful, but not completely necessary, means of keeping a circadian rhythm.
So… What else is going on?
Dr. Panda and his team did a lot of science that is well beyond the scope of this main feature, but to give you an idea:
- With jargon: it explored the mechanisms and transcription translation negative feedback loops that regulate chronobiological processes, such as a histone lysine demathlyase 1a (JARID1a) that enhances Clock-Bmal1 transcription, and then used assorted genomic techniques to develop a model for how JARID1a works to moderate the level of Per transcription by regulating the transition between its repression and activation, and discovered that this heavily centered on hepatic gluconeogenesis and glucose homeostasis, facilitated by the protein cryptochrome regulating the fasting signal that occurs when glucagon binds to a G-protein coupled receptor, triggering CREB activation.
- Without jargon: a special protein tells our body how to respond to eating/fasting at different times of day—and conversely, certain physiological responses triggered by eating/fasting help us know what time of day it is.
- Simplest: our body keeps on its best cycle if we eat at the same time every day
This is important, because our circadian rhythm matters for a lot more than sleeping/waking! Take hormones, for example:
- Obvious hormones: testosterone and estrogen peak in the mornings around 9am, progesterone peaks between 10pm and 2am
- Forgotten hormones: cortisol peaks in the morning around 8:30am, melatonin peaks between 10pm and 2am
- More hormones: ghrelin (hunger hormone) peaks around 10am, leptin (satiety hormone) peaks 20 minutes after eating a certain amount of satiety-triggering food (protein does this most quickly), insulin is heavily tied to carbohydrate intake, but will still peak and trough according to when the body expects food.
What does this mean for us in practical terms?
For a start, it means that intermittent fasting can help guard against metabolic and related diseases (including inflammation, and thus also cancer, diabetes, arthritis, and more) a lot more if we practice it with our circadian rhythm in mind.
So that “8-hour window” for eating, that many intermittent fasting practitioners adhere to, is going to do much, much better if it’s 10am to 6pm, rather than, say, 4pm to midnight.
Additionally, Dr. Panda and his team found that a 12-hour eating window wasn’t sufficient to help significantly.
Some other take-aways:
- For reasons beyond the scope of this article, it’s good to exercise a) early b) before eating, so getting in some exercise between 8.30am and 10am is ideal
- It also means it’s beneficial to “front-load” eating, so a large breakfast at 10am, and smaller meals/snacks afterwards, is best.
- It also means that getting sunlight (even if cloud-covered) around 8.30am helps guard against metabolic disorders a lot, since the light remains the body’s go-to way of knowing the time.
- We realize that sunlight is not available at 8.30am at all latitudes at all times of year. Artificial is next-best.
- It also means sexual desire will typically peak in men in the mornings (per testosterone) and women in the evenings (per progesterone), but this is just an interesting bit of trivia, and not so relevant to metabolic health
What to do next…
Want to stabilize your own circadian rhythm in the best way, and also help Dr. Panda with his research?
His team’s (free!) app, “My Circadian Clock”, can help you track and organize all of the body’s measurable-by-you circadian events, and, if you give permission, will contribute to what will be the largest-yet human study into the topics covered today, to refine the conclusions and learn more about what works best.
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Fiber Fueled – by Dr. Will Bulsiewicz
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We generally know that for gut health we should eat fiber, but what of the balances of different sorts of fiber?
That’s one of the main things that make this book stand out—fostering diversity in our microbiome by fostering diversity in our diet. Specifically, diversity of fiber-containing foods.
The book is part “science made easy for the lay reader”, and part recipe book. The recipes come with shopping lists and a meal planner, though we would recommend to use those as a guide rather than to try to adhere perfectly to them.
In particular, this reviewer would encourage much more generous use of healthful seasonings… and less reliance on there being leftovers several days later (tasty food gets gone quickly in this house!)
As for the science, the feel of this is more like reading a science-based observational documentary with explanations, than of reading a science textbook. Studies are mentioned in passing, but not dissected in any detail, and the focus is more on getting the key learnings across.
Bottom line: if you’d like to boost not just the amount, but also the diversity, of fiber in your diet, and reap the gut-health rewards, this book is a great guide for that!
Click here to get your copy of “Fiber Fueled” from Amazon today!
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Cynthia’s Thoughts on Intermittent Fasting
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The Myth of Breakfast and Snacking
Here at 10almonds we love addressing misconceptions in the health world.
When it comes to eating habits and fasting, we’ve written our own pieces on how to break your fast (otherwise known as break-fast, or breakfast), alongside a general breakdown of intermittent fasting, and a much-requested piece on fasting specifically for women.
Cynthia Thurlow, though, instead of just writing a few articles, has dedicated the majority of her working years to intermittent fasting and, in her TEDx talk (below), makes a strong argument challenging the long-held belief that breakfast is the most important meal of the day.
Cynthia Thurlow’s Two Main Points
Thurlow argues that it’s not what you eat but when you eat that has a more profound impact on health and aging. And she argues this is crucial regardless of your age.
Complementing her views on fasting are her views on snacking; she argues that snacking all day long is outdated advice and can overtax the digestive system, leading to various health issues.
Practical Tips for Starting Intermittent Fasting
To begin intermittent fasting, Thurlow suggests starting with a 12-13 hour fasting window and gradually increasing it to 16 hours.
In terms of food choice, she recommends eating whole, unprocessed foods during eating periods as well as staying well-hydrated with water, coffee, or tea.
But you won’t see results immediately; Thurlow advises giving the strategy a solid 30 days to see results and consulting a healthcare provider if there are any existing health conditions.
You can dive deeper and join the 15 million other people who have listened to her thoughts on fasting by watching her TEDx talk below:
How was the video? If you’ve discovered any great videos yourself that you’d like to share with fellow 10almonds readers, then please do email them to us!
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Is Unnoticed Environmental Mold Harming Your Health?
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Environmental mold can be a lot more than just the famously toxic black mold that sometimes makes the headlines, and many kinds you might not notice, but it can colonizes your sinuses and gut just the same:
Breaking the mold
Around 25% of homes in North America are estimated to have mold, though the actual number is likely to be higher, affecting both older and new homes. For that matter, mold can grow in unexpected areas, like inside air conditioning units, even in dry regions.
If mold just sat where it is minding its own business, it might not be so bad, but instead they release their spores, which are de facto airborne mycotoxins, which can colonize places like the sinuses or gut, causing significant health issues.
Not everyone in the same household is affected the same way by mold due to genetic differences and varying pre-existing health conditions. But as a general rule of thumb, mold inflames the brain, nerves, gut, and skin, and can negatively impact the vagal nerve, which is linked to the gut-brain connection. Mycotoxins also damage mitochondria, leading to symptoms like fatigue, brain fog, and cognitive issues. To complicate matters further, mold illness can mimic other conditions like anxiety, chronic fatigue, fibromyalgia, IBS, and more, making it difficult to diagnose.
Testing is possible, though they all have limitations, e.g:
- Home testing: testing the home for mold spores and mycotoxins is crucial for effective treatment; professional mold remediation companies are a good idea (to do a thorough job of cleaning, without also breathing in half the mold while cleaning it).
- Mold allergy testing: mold allergy testing (IgE testing or skin tests) is often used, but it doesn’t diagnose mold-related illnesses linked to severe symptoms like fatigue or neurodegeneration.
- Serum antibody testing: tests for immune reactions (IgG) to mycotoxins may not always show positive results if the immune system is weakened by long-term exposure.
- Urine mycotoxin testing: urine tests can detect mycotoxins in the body, though are likely to be more expensive, being probably not covered by public health in Canada or insurance in the US.
- Organic acid testing: this urine test can indicate mold colonization in areas like the sinuses or gut. Again, cost/availability may vary, though.
For more information on all of this, enjoy:
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Celeriac vs Celery – Which is Healthier?
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Our Verdict
When comparing celeriac to celery, we picked the celeriac.
Why?
Yes, these are essentially the same plant, but there are important nutritional differences:
In terms of macros, celeriac has more than 2x the protein, and slightly more carbs and fiber. Both are very low glycemic index, so the higher protein and fiber makes celeriac the winner in this category.
In the category of vitamins, celeriac has more of vitamins B1, B3, B5, B6, C, E, K, and choline, while celery has more of vitamins A and B9. An easy win for celeriac.
When it comes to minerals, celeriac has more copper, calcium, iron, magnesium, manganese, phosphorus, potassium, selenium, and zinc, while celery is not higher in any minerals. Another obvious win for celeriac.
Adding these sections up makes for a clear overall win for celeriac, but by all means enjoy either or both!
Want to learn more?
You might like to read:
What’s Your Plant Diversity Score?
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Radiant Rebellion – by Karen Walrond
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In health terms, we are often about fighting aging here. But to be more specific, what we’re fighting in those cases is not truly aging itself, so much as age-related decline.
Karen Walrond makes a case that we’ve made from the very start of 10almonds (but she wrote a whole book about it), that there’s merit in looking at what we can and can’t control about aging, doing what we reasonably can, and embracing what we can’t.
And yes, embracing, not merely accepting. This is not a downer of a book; it’s a call to revolution. It asks us to be proud of our grey hairs, to see our smile-lines around our eyes as the sign of a lived-in body, and even to embrace some of the unavoidable “actual decline” things as part of the journey of life. Maybe we’re not as strong as we used to be and now need a grippety-doodah to open jars; not everyone gets to live long enough to experience that! How lucky we are.
Perhaps most importantly, she bids us be the change we want to see in the world, and inspire others with our choices and actions, and shake off ageist biases for good.
Bottom line: if you want to foster a better attitude to aging not only for yourself, but also those around you, then this is a top-tier book for that.
Click here to check out Radiant Rebellion, and reclaim aging!
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Rewire Your OCD Brain – by Dr. Catherine Pittman & Dr. William Youngs
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OCD is just as misrepresented in popular media as many other disorders, and in this case, it’s typically not “being a neat freak” or needing to alphabetize things, so much as having uncontrollable obsessive intrusive thoughts, and often in response to those, unwanted compulsions. This can come from unchecked spiralling anxiety, and/or PTSD, for example.
What Drs. Pittman & Young offer is an applicable set of solutions, to literally rewire the brain (insofar as synapses can be considered neural wires). Leveraging neuroplasticity to work with us rather than against us, the authors talk us through picking apart the crossed wires, and putting them back in more helpful ways.
This is not, by the way, a book of CBT, though it does touch on that too.
Mostly, the book explains—clearly and simply and sometimes with illustrations—what is going wrong for us neurologically, and how to neurologically change that.
Bottom line: whether you have OCD or suffer from anxiety or just need help dealing with obsessive thoughts, this book can help a lot in, as the title suggests, rewiring that.
Click here to check out Rewire Your OCD Brain, and banish obsessive thoughts!
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