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The Circadian Classroom

Zaid K. Dahhaj
Hundreds of paid subscribers

Circadian biology from first principles. Fix your sleep, metabolism, and energy without drugs or confusion.

Platform
Substack
PricingFreemiumPublishesDaily
Issues337Founded4 years agoLast Issue5 days ago
Active

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Latest Issues

Your Body Absorbs Blue Light and Emits Red

Right now, inside every cell in your body, there is a molecule absorbing blue light and converting it into red light. It sits inside your mitochondria. It predates humans by billions of years. It is part of the same chemical family that mak...

5 days ago
22
2

Why I Stop Eating Well Before Sunset

I repeat it often, but every cell in your body runs on a 24 hour circadian clock. Your liver, pancreas, gut, and immune system all have internal oscillators that expect food during daylight hours and expect silence at night. When you eat ou...

6 days ago
35
11

Red & Infrared × UV: The Synergy Science

I have strongly stood by the notion that shorter (UV and blue) and longer (red and infrared) light wavelengths have a synergistic relationship to facilitate the health of human beings within the context of circadian alignment.

This is why...

8 days ago
15
5

UV Light Creates Lesions, But Circadian Disruption Turns Them Into Mutations

Do I need to remind you that UV light creates DNA lesions like thymine dimers and cyclobutane pyrimidine dimers, which are categorically DISTINCT from DNA mutations?

A lesion is damage. A mutation is a permanent heritable change to the gen...

10 days ago
12
4

Burn vs. Tan: A Biology First Guide to Understanding Sun Exposure

When UV-B reaches your skin, the primary target is the keratinocyte, the dominant cell type in the epidermis. UV-B carries enough energy to directly damage DNA, specifically by fusing adjacent thymine bases into what are called cyclobutane...

12 days ago
55

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  • Zaid K. Dahhaj

    Your doctor is afraid of the sun. I’m not. Circadian biology is the medicine they never taught.

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