Tag Archives: circadian rhythm

Circadian clocks, entrainment, and health

Posted on December 3, 2018 | Leave a comment

Summary of a presentation by Orie Shafer titled “Circadian timekeeping and entrainment in neuronal clock networks.”

From the classic Wever study, which put participants in underground dungeons to study circadian rhythms in the absence of sunlight…

and showed there are multiple inputs, both external and internal zeitgebers.

In this study, in the absence of sunlight, the human circadian rhythm in locomotor activity, bed movements, and rectal temperature was about 25.8 hours:

The study wasn’t perfect, but still cool.

Most people like to simplify and say light is the input, and while it may be the main one, we now know there are also other important inputs such as food intake for the food-entrainable oscillator and exercise for the skeletal muscle clock.

“Behavorial rhythms are driven by molecular rhythms. Molecular clocks are required in small islands of the brain for behavorial, endocrine, and physiological rhythms.” Search for genetically modified models of virtually any clock gene and it’s going to influence a wide variety of processes. Like, circadian rhythms are important for certain aspects of nearly everything. “60% of the time, it works every time” lol

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Posted in angiotensin, Bromocriptine, Cabergoline, chronopharmacology, circadian, Dopamine, melatonin, mortality, sex, sleep, Sun, vasopressin, Vitamin D

Tagged circadian rhythm, melatonin

Deleterious effects of artificial light at night on health and the environment

Posted on November 25, 2018 | Leave a comment

Evidence summary on how our increasing exposure to artificial blue light is putting us at risk. And actionable steps on what you can do about it.

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It’s not blue light per se, but rather underexposure to natural sunlight during the day and overexposure to artificial light at night (ALAN). Step 1: Do the opposite of that.

“Bright light occurs naturally as part of sunlight and moonlight and, like all living things on Earth, we have evolved to respond to the daily cycle of light and dark. There is growing concern that the increased exposure to artificial light at nigh is having an effect on our health, wildlife, and the night sky.”

Your eyeballs are pretty awesome. Rods and cones and these crazy cells that respond specifically to daylight. The crazy cells, ipRGCs, respond to light, particularly in the green/blue range of visible and serve, in part, to entrain the central component of your circadian clock in the SCN. This is important and influences many body functions such as sleep, metabolism, immune system, mood, and even certain disease processes.

If you’re more interested in the environmental impact of artificial light (eg, street lamps), book recommendation: The End of Night: Searching for Darkness in an Age of Artificial Light. If you’re more interested in the human effects: Lights Out: Sleep, Sugar, and Survival.

ALAN-induced clock disruption is said to have “flow-on” negative health effect — there’s no “good news / bad news” to this story (it’s all bad news).

Rock hot blue blockers at night. Use blue light filters on your devices like f.lux and Iris. Sunlight during the day; darkness, moonlight, or firelight at night.

Note those spectral sensitivities – we can see more green/blue than any other colors. Maybe there’s a reason for that?

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Posted in Advanced nutrition, angiotensin, Bromocriptine, Cabergoline, cancer, chronopharmacology, circadian, depression, diabetes, Dopamine, melatonin, mortality, nicotine, sex, sleep, Sugar, Sun, testosterone, vasopressin, Vitamin D

Tagged circadian rhythm, dopamine, melatonin, mortality

Entrain all of your circadian clocks. Full stop.

Posted on October 17, 2018 | Leave a comment

Skipping breakfast shifts skin circadian clock and enhances UVB-induced skin aging and cancer (Wang et al., 2017)… ok, that’s not the real title of the paper, but it’s what the research showed. And it’s kind of amazing.

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Regarding skin cancer and wrinkles, there are two basic processes to focus on: proliferation and protection.

These processes don’t really overlap: you want endogenous protective mechanisms during the day, to protect against UV rays, and you don’t want to be proliferating at this time because that would increase the chances of a malignant mutation being passed on.

Conversely, at night when the risk of UV-induced DNA damage is considerably less, it’s a green light for proliferation of skin cells. This is healthy, anti-aging-like turnover of skin cells.

We’ve discussed the importance of co-entrainment of your circadian clocks in the path: sunlight in the morning to start up the central pacemaker, breakfast in the morning to co-entrain many of the peripheral clocks with the master clock, exercise to get the skeletal muscle clock on board… but now we have another reason for breakfast: to co-entrain the circadian rhythms in your skin!

Consequences of skipping breakfast, going to the gym at night, staying up late, and having a big dinner: increased risk of obesity, diabetes, cardiovascular disease, cancer, etc., etc…

In this study: skin aging and cancer.

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Posted in angiotensin, Bromocriptine, Cabergoline, cancer, chronopharmacology, circadian, depression, diabetes, Dopamine, Exercise, melatonin, muscle, Protein, sex, sleep, Sun, testosterone, vasopressin, Vitamin D

Tagged circadian rhythm

“The Danger of Being an Owl” — sounds scary, right?

Posted on September 16, 2018 | Leave a comment

^^^ from a recent Vox article. It’s brief, and relatively in line with what I’ve slowly come to think is true about chronotypes. That is, they’re a species-level property. For example, there are morning larks and night owls. There aren’t morning owls.

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Virtually every human study on chronotypes is remarkably consistent: humans aren’t a night-species.

Evening chronotype is associated with changes in eating behavior, more sleep apnea, and increased stress hormones in short sleeping obese individuals (Lucassen et al., 2013)

They basically put all of the results in the title lol. People who stayed up late and skipped or delayed breakfast had higher stress hormones, lower HDL, and were of generally poorer health.

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Posted in Advanced nutrition, chronopharmacology, circadian, mortality, muscle

Tagged circadian rhythm

Artificial light at night: effects on cardiovascular disease

Posted on September 8, 2018 | Leave a comment

There is now increasing evidence that exposure to artificial light in the evening and at night increases the risk of cardiovascular disease (Moore-Ede, 2018). Because most “energy efficient” LED light are rich in blue wavelengths, the use of these lights can trigger disease processes involved in hypertension, atherosclerosis, and cardiovascular disease.

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Circadian disruption, melatonin suppression & phase shifting, and activation of chronic inflammatory pathways.

Sunlight during the day is protective; artificial light at night is harmful. Blue light filters on your smart devices and hot blue blockers on your face are protective.

As always, the effects are most pronounced in actual shift workers who see 20-40% increases in risk of cardiovascular disease, heart attacks, and coronary artery disease…

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Posted in Advanced nutrition, angiotensin, Bromocriptine, Cabergoline, chronopharmacology, circadian, Dopamine, melatonin, nicotine, sleep, Sun, vasopressin, Vitamin D

Tagged circadian rhythm

Artificial light at night: effects on breast & prostate cancer

Posted on September 1, 2018 | Leave a comment

There is now substantial evidence that exposure to artificial light at night (ALAN) increases the risk of breast and prostate cancer (Moore-Ede, 2018).

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MOA of ALAN: circadian disruption & phase shifting, melatonin-suppression, and accelerated unsuppressed tumor growth.

Sunlight during the day is protective. Artificial light at night is harmful.

ALAN-induced melatonin-suppression and circadian disruption increases the risk for certain endocrine-sensitive cancers. While this is most blatantly manifested in shift-workers, it also holds for people who sleep with the lights on and those exposed to, for example, street lamps shining light through bedroom windows at night.

50% increased risk of breast cancer in female shift workers. Up to 200% increased risk prostate cancer in male shift workers.

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Posted in angiotensin, Bromocriptine, Cabergoline, cancer, chronopharmacology, Dopamine, melatonin, mortality, sex, sleep, Sun, testosterone, vasopressin, Vitamin D

Tagged circadian rhythm, melatonin

Artificial light at night: effects on obesity and diabetes

Posted on August 23, 2018 | Leave a comment

“There is now substantial evidence that exposure to blue-rich light in the evening and at night increases the risk of obesity and diabetes (Moore-Ede 2018)”

I concur.

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The upstream mediator is disruption of the circadian system. More downstream is melatonin suppression and phase shifting which promote nutrient anti-partitioning, late eating patterns, mindlessly poorer food choices, etc., etc.

Don’t get me wrong, sunlight in the morning and during the day is great… it’s even protective against artificial light at night (ALAN)-induced melatonin suppression… it’s just this ALAN we’re talking about.

Obesity is almost doubled in people who sleep with the lights on at night. I have no idea how this happens, maybe by accident, or they just fall asleep reading or something. But for whatever reason, risk of obesity = doubled.

Many more facts, figures, and what to do about it… but for that, head over to Patreon! Five bucks a month for full access and there are many other options. It’s ad-free and you can cancel if it sucks 🙂

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Posted in Advanced nutrition, angiotensin, Bromocriptine, Cabergoline, chronopharmacology, circadian, Dopamine, melatonin, sex, sleep, Sun, vasopressin

Tagged circadian rhythm, melatonin

Anabolic Heterogeneity Following Resistance Training: A Role for Circadian Rhythm?

Posted on July 23, 2018 | Leave a comment

YES!

Resistance exercise stimulates muscle growth, strength, and functionality (Camera, 2018), although the inter-individual variability in response is hyooge. People used to think there were “responders” and “non-responders,” although now we know everyone benefits but there’s a wide spectrum. WHY?

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Exercise timing? There are definitely circadian clock genes and rhythmic expression of many genes involved in muscle growth, strength, and functionality.

Physical inactivity and sedentary behavior in general is bad. Physical activity is good. Load-bearing resistance is exercise is better. Is proper circadian timed exercise even better? Can you get slightly better benefits at the same workload?

WHY is this important?!

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Posted in Advanced nutrition, circadian, Exercise, muscle, strength, Sun

Tagged circadian rhythm, melatonin, muscle, nutrition, protein

“The Big Breakfast Study” !

Posted on July 7, 2018 | 1 comment

Chrono-nutrition influence on energy expenditure and body weight (Ruddick-Collins et al., 2018) HT/ Robb Wolf

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“A growing body of evidence highlights the importance of the biological clock as a modulator of energy balance and metabolism. Recent studies in humans have shown that ingested calories are apparently utilized more efficiently in the morning than in the evening and this is manifest through improved weight loss, even under iso-energetic calorie intake.” YES!!!

Book recommendation: Why We Sleep

People eating 3 square meals a day shouldn’t be ingesting >40% of their calories late at night. <33% prior to sunset is more like it.

“The SCN of the hypothalamus, the ‘master clock,’ is primarily regulated by the light/dark cycles in order to synchronise the body to the light cycle or solar day…” but it also must by sync’d to the peripheral clocks! aka ‘food-entrainable oscillators’ (FEO).

Sure, caffeine and exercise can influence the liver and skeletal muscle clocks, respectively, but for full central & peripheral co-entrainment: FOOD and LIGHT in the morning (exercise and caffeine are optional for this).

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Posted in Advanced nutrition, circadian, Energy balance, Ketosis, Protein, Sun

Tagged circadian rhythm, ketosis

Intermittent Fasting and Goalposts

Posted on June 30, 2018 | Leave a comment

I may come across as harsh on Intermittent Fasting (IF) and I’d like to be clear about something. I’m not saying IF will make you gain body fat or die a slow and painful death. I am saying the quality of evidence presented in human studies suggesting it will benefit you somehow is #weaksauce. Further, I don’t really like the idea of huge refeeds. Like, how can 2000 kcals in one sitting be remotely healthy?

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Metabolic. Mayhem.

You may have noticed many guru’s sliding away from “intermittent fasting” and “skipping breakfast” and toward promoting a more circadian-appropriate feeding pattern. That’s because it’s about when you eat, not the precise duration of the feeding window.

The studies have been done:

Jacobs & Hirsh showed that eating all your food for breakfast is more conducive to weight loss than eating all your food for dinner.
Melatonin sensitizes the system, priming your body for optimal nutrient partitioning in the morning.
Metabolism is gimped at night.
“early Time-Restricted Feeding” (eTRF) works even in the absence of weight loss.
Your metabolism is naturally more ketogenic with an earlier feeding window.

Which brings me to the current IF study #weaksauce du jour and it’s implications. But for that you’re gonna have to head on over to Patreon! Five bucks a month gets you access to all articles and there are many other options. It’s ad-free and you can cancel if it sucks 🙂

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