The Frontier

Cortisol is not a stress hormone but an energy-deploying hormone that releases energy from muscles and the liver for the brain and body. You want it high in the morning and low in the evening.

There is a 60-90 minute window after waking where viewing bright light, ideally sunlight or a 10,000 lux artificial source, will spike your cortisol. Missing this window and getting light later suppresses cortisol.

Cortisol and melatonin are directly antagonistic. A high morning cortisol spike, aided by sunlight, ensures low cortisol and high melatonin at night, which improves sleep quality.

Caffeine does not spike cortisol but extends the duration of the cortisol curve. Exercise and licorice root (via the compound glycyrrhizin) can increase cortisol.

A flattened cortisol curve, where levels are too high in the afternoon, predicts worse immune function, reduced recovery from disease, and decreased longevity.

Long-wavelength infrared light (e.g., 850nm) can penetrate clothing and the entire body, charging mitochondria by restoring their membrane potential and increasing cellular energy production.

A UK study with over 80,000 subjects found that brighter days and darker nights independently control mental health, correlating with better outcomes for OCD, trauma, and depression.

Dermatologist Dr. Teo Solimani stated that deadly melanomas often originate in areas not exposed to the sun, like the soles of the feet.

Products containing synthetic lavender, evening primrose oil, or tea tree oil are endocrine disruptors, according to fertility specialist Dr. Natalie Crawford.

The human olfactory system is extraordinarily sensitive; we can detect certain odorants at a concentration of one drop in an Olympic-sized swimming pool, which unconsciously shapes cognition and memory.

Memory encoding is better during the inhale phase of breath than the exhale, as inhaling primes the brain's memory centers, a function rooted in our primordial need to assess the environment.

Olfactory and taste receptors exist in the gut lining, where they detect food chemicals and signal via the vagus nerve to influence food preferences and dopamine release.

Suppressing innate feelings or intuitions, like 'gut feelings,' over time leads to a diminished ability to access them, similar to how masking natural scents numbs olfaction.

Blue light from screens can thin the retina and contribute to macular degeneration by depleting mitochondria in photoreceptors, according to recent studies.

Experiencing the gradual transition of light at sunrise and sunset is optimal for circadian entrainment, better than simply getting bright light after sunrise.

A PNAS study found children sleeping with a 100-lux nightlight had elevated morning blood glucose levels, linked to cortisol being too high overnight.