Light environment

A healthy light environment supports circadian rhythms and can have a big impact on metabolic health.

Strong consensus

For quantum biology and circadian health.

Sourced from the doctors, PhDs and clinicians behind Entrain. Updated

The strongest voice

“the sun grows your plants that you eat or the animals that eat the plants basically digesting sunshine so get your light environments right”

a board-certified cardiologist · source video · 00:00:20

In their own words

One faithful sentence per source, linked to the moment it was said; quiet chips mark where money is involved.

a GP with a Master of Public Health recommend
“The expert highlights that light, not just diet, is central to achieving optimal health.”

a GP with a Master of Public Health · source video · 00:00:40

a licensed naturopathic physician recommend
“Hydration is also about supporting mitochondria and light environment, not just water intake.”

a licensed naturopathic physician · Instagram reel

a registered nutritional therapist recommend
“Light environment influences cortisol's role and regulation.”

a registered nutritional therapist · Instagram reel

a certified naturopath recommend
“Exposure to natural light supports circadian rhythm and hormonal health.”

a certified naturopath · Instagram reel sponsored

a licensed naturopathic physician recommend
“Hydration is not just about water intake but also about supporting mitochondria and light exposure.”

a licensed naturopathic physician · Instagram reel · 00:00:00

a certified nutrition and mineral coach recommend
“Fixing your light environment is foundational to health and circadian rhythm balance.”

a certified nutrition and mineral coach · Instagram reel

Worth discussing with your GP, especially if you take medication or are pregnant. Entrain describes what is publicly taught; it does not prescribe.

Natural light exposure

Natural light exposure is essential for healthy circadian rhythms and mood.

Strong consensus

“it's really teaching us how critical it is to get outdoors and exposed to light like you are right now”

a Princeton-trained molecular biology PhD · source video · 00:00:05

Outdoor time

Spending time outdoors supports circadian rhythms, resilience, and mental well-being.

Strong consensus

“when you spend extended time in the back country, say camping, like under the stars or in a tent, and we're disconnected from technology, I think it takes three three nights, three nights or four nights, and when you come back, your brain has actually reset and it's become a sponge again.”

a licensed acupuncturist and clinician-educator · source video · 00:00:05

Incandescent bulb

Incandescent bulbs are a gentle, low-blue light option for home lighting, supporting circadian health.

Strong consensus

“Anywho, I buy all my incandescent bulbs from a specialist lighting shop they are the best.”

a Princeton-trained molecular biology PhD · Instagram post