06/03/2026
âźď¸Why I ditched sunglasses đâźď¸
About 2.5 years ago, I stopped wearing sunglasses.
Not because I lost them or decided to change my style. I stopped because I realized they were interfering with one of the most powerful healing forces available to the human body: sunlight.
Today, most people avoid the sun and shield their eyes with dark lenses. Weâve been told that sunlight is dangerousâthat it damages our skin, our eyes, and accelerates aging.
But the truth is: our bodies are designed to function in harmony with the sun.
When you block natural light from entering your eyes, you disrupt deep biological processes that regulate your sleep, your metabolism, your heart health, and even your liver function.
Hereâs the science behind why I ditched sunglassesâand why you might want to do the same.
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âď¸ Your Eyes Are Light Sensors, Not Just Cameras
Inside the retina lies a concentration of DHA (docosahexaenoic acid)âan omega-3 fatty acid with unique electrical and photonic properties. Think of your retina as a biological solar panel. When lightâespecially early morning UVA and UVB wavelengthsâstrikes the DHA-rich retina, it generates electrical signals that travel through the brain and nervous system.
But thereâs a problemâŚ
Most people are deficient in retinal DHA.
Thatâs because the human body cannot make DHA in sufficient amounts on its own. It must come from the dietâspecifically from cold-water seafood like wild salmon, sardines, and anchovies. Unfortunately, most modern diets are dangerously low in seafood, leading to DHA deficiency in the retina and brain.
Low DHA means poor light signaling. Poor signaling means disrupted circadian rhythm, poor melatonin production, and impaired organ function.
If youâre not eating seafood 2â3 times per week, your retinaâand your heartâare missing critical fuel.
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đ Melatonin: Not Just for Sleep
We often associate melatonin with nighttime and sleep. But melatonin is also produced in the eye during the day when exposed to sunlight. This retinal melatonin plays a crucial role in:
⢠Protecting against oxidative damage
⢠Maintaining healthy intraocular pressure
⢠Regulating circadian rhythms
⢠Supporting mitochondrial function
And melatonin isnât just about sleep quality. Itâs one of the most powerful endogenous antioxidants, especially inside the mitochondria where energy is made and free radicals are born.
Without proper sunlight exposureâparticularly in the eyesâmelatonin production drops, oxidative stress rises, and inflammation begins to take hold. That inflammation doesnât just affect the brain and eyesâit impacts the entire cardiovascular system.
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đĽ UVA Light, Nitric Oxide, and Blood Pressure
When UVA light hits your skin, it triggers the release of nitric oxide (NO) from endothelial stores. NO is a vasodilator, which means it widens blood vessels, reduces vascular resistance, and lowers blood pressure naturally.
This means that sunlight isnât just about vitamin Dâitâs a direct regulator of cardiovascular tone. In fact, studies show that sunlight exposure is associated with lower blood pressure and reduced risk of cardiovascular mortality, even when vitamin D levels are held constant.
But sunglasses confuse the body. They create the illusion of darkness even when your skin is in sunlight. This mismatch blunts nitric oxide release, disrupts hormonal signaling, and impairs the healing cascade meant to occur with sun exposure.
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âď¸ UVB Light and Vitamin D: The Cholesterol Hormone
UVB rays activate 7-dehydrocholesterol in the skin to produce vitamin D3âa hormone, not just a vitamin. Vitamin D plays a massive role in heart health by:
⢠Improving insulin sensitivity
⢠Lowering inflammation
⢠Enhancing endothelial function
⢠Reducing arterial stiffness
⢠Supporting LDL receptor expression in the liver
Low vitamin D levels are directly linked to increased cardiovascular disease, heart attacks, strokes, and even sudden cardiac death.
Once again, without sunlightâand especially if youâre wearing sunglassesâyour body misses the environmental cues necessary to stimulate these processes.
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𧏠Liver Dysfunction, LDL Receptors, and Oxidized Cholesterol
Now letâs dive deeper.
The liver is one of the most light-sensitive organs in the bodyâeven though it doesnât see light directly. Thatâs because the liver operates on a circadian rhythm, and that rhythm is entrained by light through the eyes.
When sunlight enters the eye and travels to the SCN and down the cervical chain, it signals the liver to:
⢠Detoxify
⢠Produce bile
⢠Regulate metabolism
⢠Synthesize LDL receptors
Those LDL receptors are essential. They remove low-density lipoprotein (LDL) cholesterol from the blood. But when sunlight is lacking and circadian signaling is impaired, LDL receptor expression drops.
Fewer LDL receptors = more circulating LDL = higher risk of oxidized LDL (oxLDL).
Oxidized LDL is one of the key contributors to atherosclerosis. It damages the vascular endothelium, triggers immune responses, and accelerates plaque formation.
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đĽ Endothelial Dysfunction: The Final Blow
The endothelium is the thin inner lining of your blood vessels. It is incredibly sensitive to circadian disruption, oxidative stress, and inflammation.
When your eyes donât get proper sunlight:
⢠Melatonin drops â Less mitochondrial protection
⢠NO drops â Less vasodilation
⢠LDL receptor activity drops â More oxidized LDL
⢠Vitamin D drops â More vascular stiffness and inflammation
This toxic combination damages the endothelium. The vessels lose flexibility. Blood flow is impaired. And oxidized cholesterol sneaks through the cracks to form plaque.
This is the beginning of heart disease.
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đ§ Summary: The SunlightâEyeâLiverâHeart Axis
Hereâs how it all connects:
1. Sunlight enters the eye, hitting a DHA-charged retina.
2. Signals travel to the SCN, the bodyâs master clock.
3. From there, signals pass down the cervical sympathetic ganglia, regulating liver and hormonal function.
4. The pineal gland uses this input to produce melatonin.
5. The skin, in response to UVA and UVB, produces nitric oxide and vitamin D.
6. The liver, under circadian control, produces LDL receptors.
7. When this system is working, LDL is cleared, inflammation is low, and blood vessels stay healthy.
8. When sunlight is blocked (e.g. by sunglasses or indoor living), the system breaks.
9. The result? DHA deficiency, oxidized LDL, endothelial dysfunction, and
Let the light in. Feed your eyes. Protect your heart! Live Elevated!
