Happy Circadian Day!


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🌞10 Uncommon Circadian Facts & my Perfect Circadian Day Ebook in case you don't have it (no charge)
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7/24 - Happy Circadian Awareness Day!

Today is 7/24 - a date that happens to match the 24-hour internal rhythm that governs everything from your hormones to your hunger, sleep, and metabolism (my favorite topic)!

Most people have heard of circadian rhythms, but few actually know how to work with them (especially in the modern world).

So in honor of your body’s internal clock, I'm going to share my free ebook on How to Build your Perfect Quantum Day & 10 Circadian Facts you might not know (or maybe need a refresher on)......so you can be a hit at your next dinner party or just that annoying friend full of random facts πŸ˜‚!

Keep reading for the ebook & the Circadian facts:

🚨 Leptin Master Plan is running again in August (now comes with the Leptin Reset) (my advanced leptin course for coaches or people who have a desire to learn about leptin on a deeper level) this will re-release on August 15th with 6 live zoom sessions with me! Get $500 off Early Bird through July 31 - Click here reply to this email with any questions

🌞 MyCircadianApp Contest - Between now & July 31st - we will choose 3 winners who leave me a review (on Apple or on Google) to get lifetime access to the app AND one of my courses of their choice! All you have to do to enter is leave a written review between now and July 31st!

​New here? ​Grab my $5 Seasonal Food Course, my $7 Cortisol Course - or explore all mini courses & bundles ​

Enjoy these 10 Circadian Facts with tons of references for those seeking more data (and keep reading for the Perfect Quantum Day Ebook in case you don't have it already).

1. Over 50% of your genes are light-sensitive.

A 2014 study in Cell found that 43%–83% of protein-coding genes are rhythmically expressed - and these rhythms are largely driven by environmental light cues (Zhang et al., 2014).

2. The sun triggers hormone cascades labs can’t adequately replicate.

Within minutes of sunrise, light triggers a cortisol awakening response (CAR), thyroid hormone surge, and dopamine release - without supplements or food.

These cascades are photoentrained via the SCN β†’ HPA β†’ peripheral clocks.

3. Sunglasses at sunrise can blunt your metabolic response.

Melanopsin-expressing retinal ganglion cells (ipRGCs) require direct, unfiltered light to signal circadian clocks, and regulate body temperature and sleep (see study).

Block that light with sunglasses, and you blunt leptin signaling, alertness, and fat oxidation.

4. Eating before light (or after dark) increases obesity risk.

​A 2024 study found that late-night eating increases obesity risk by 67%, even when calories are controlled (Xiao et al., 2024).​

Your insulin sensitivity is circadian - highest in the morning, lowest at night.

5. Artificial light is now considered a metabolic toxin.

​A 2022 paper in Nature Reviews Endocrinology labeled light at night (LAN) as an independent risk factor for:​

  • Obesity
  • Insulin resistance
  • Depression
  • Cancer

Even dim light at night disrupts melatonin and glucose metabolism.

6. Your brain’s detox system only works on a circadian clock.

The glymphatic system - which clears neurotoxins like beta-amyloid - is most active during deep sleep, which only happens with proper light cues during the day. (see study)

Miss morning light or scroll until late at night β†’ delay melatonin β†’ impair brain cleanup.

7. Circadian disruption & timing of administration can blunt supplement and medication efficacy.

Drug metabolism, absorption, and enzyme activity are all time-of-day dependent.

You can take the β€œright supplement” at the wrong time and get less or no benefit. (see study)

8. Infrared light can halt cancer cell growth via mitochondria.

A 2023 study exposed breast cancer cells to near-infrared light (NIR) and found they stopped proliferating and entered senescence - no drugs needed (click here to read my article on this).​

Sunrise and sunset are rich in NIR (and you can get NIR even in the shade or on cloudy/rainy days). Indoor life is missing this wavelength entirely!

9. Your food & nutrient absorption is only as effective as your circadian state.

Even antioxidant and nutrient absorption is regulated by circadian rhythms (see study).

In other words: you're not just what you eat. You’re what your mitochondria can do with it - based on light, timing, and redox state.

10. Your genes don’t work without time cues.

Without strong zeitgebers (time-givers) like sunlight, meal timing, and darkness, your gene expression becomes erratic β€” and so does your metabolism.

Circadian misalignment mimics aging and neurodegeneration - regardless of age.

Love learning like this & want to learn how to implement this information on a deeper level?

​Click here to get Early Bird Pricing for the Leptin Master Plan (and get instant access to The Leptin Reset & The Red light therapy course).

Want to Start Learning for Free?

​Download the MyCircadianApp - it’s completely free and helps your (and your clients) track:

  • Sunrise and sunset
  • Lux (crucial for mental health - melatonin and metabolism)
  • UVA and vitamin D timing (to avoid risk of over-exposure)
  • Moon phase and light windows
  • And log their sun exposure sessions

​Try the full version on a free trial with code SARAHK​

Forward this to a friend who needs to learn about light and health & ​​CLICK HERE to download my Ebook: Building your perfect Quantum Day!

​New Article: The Diabetes Study you missed ​

​New Article: The Breast Cancer Study No one is talking about ​

​New Episode: The Heavy Hydrogen that is aging you faster ​

You may have noticed that there was no new podcast episode this week!

I have decided to take a break for the first time in 5 years of podcasting, and we will be back at the end of August.

I hope you enjoyed today's newsletter & have a fantastic rest of your day.

Please feel free to forward to a friend or family member who might find this interesting.

Reading this on the web or forwarded from a a friend? Click here to subscribe so you don't miss free informative content in the future.

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In Health🌞,

Sarah

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PS - This newsletter is not medical advice nor a substitute for 1:1 care with a trusted practitioner!

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