The Wellness Mama Podcast Light and Leptin: Understanding These For Hormones, Fertility and Health With Sarah Kleiner
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Oct 27, 2025 Sarah Kleiner, applied quantum biology practitioner and creator of My Circadian App, blends circadian light biology with leptin, hormone and fertility support. She explores how light timing shapes hormones and mitochondria. Topics include morning and UV light strategies, red/infrared benefits, leptin’s role in reproduction and thyroid links, and practical morning routines for a leptin reset.
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All Hormones Are Controlled By Light
- All hormones are circadian and strongly controlled by light, with cortisol, melatonin and leptin as master hormones.
- Leptin is a light-sensitive 'energy accountant' discovered in 1994 that signals safety to thyroid, immune system, fertility and metabolism.
Leptin Levels Don't Always Match Body Fat
- Leptin levels don't map directly to body fat; low leptin can occur with weight gain after dieting and high leptin can appear in lean autoimmune patients.
- Sarah prefers female leptin between 7–10 ng/mL and considers <4 concerning.
Mitochondria Sense Light And Safety
- Mitochondria are circadian sensors and interact with leptin; poor light environment or perceived danger downregulates mitochondrial function reducing hormone output.
- Dr. Martin Picard's work shows mitochondria can drop 15–30% function under stress.