Sunlight is one of the most ignored natural remedies on Earth.
Used right, it increases testosterone, reverses your age, and improves sleep—yet no one talks about it.
So, I started researching its healing benefits...
What I discovered will blow your mind: 🧵
Used right, it increases testosterone, reverses your age, and improves sleep—yet no one talks about it.
So, I started researching its healing benefits...
What I discovered will blow your mind: 🧵
Most people think sun avoidance is healthy.
But a 20-year Swedish study of 30,000 women found that avoiding the sun was "a risk factor for death of a similar magnitude as smoking."
Non-smokers who avoided sun lived 2 years LESS than smokers who got regular sun exposure.
But a 20-year Swedish study of 30,000 women found that avoiding the sun was "a risk factor for death of a similar magnitude as smoking."
Non-smokers who avoided sun lived 2 years LESS than smokers who got regular sun exposure.
The mechanism is extraordinary:
Morning light hits melanopsin receptors → signals brain's master clock → suppresses melatonin + increases cortisol → sets 14-hour timer for natural sleep.
Your body literally programs its entire day-night cycle from that first light exposure.
Morning light hits melanopsin receptors → signals brain's master clock → suppresses melatonin + increases cortisol → sets 14-hour timer for natural sleep.
Your body literally programs its entire day-night cycle from that first light exposure.
But there's a second pathway most people miss:
UVA light converts nitrite stores in your skin → releases nitric oxide into bloodstream → dilates arteries → improves blood flow.
Southampton University proved this using controlled human trials.
Now, here's how to implement it correctly:
UVA light converts nitrite stores in your skin → releases nitric oxide into bloodstream → dilates arteries → improves blood flow.
Southampton University proved this using controlled human trials.
Now, here's how to implement it correctly:
1. Follow the timing rule:
Get sunlight within the first hour of waking. Even 10 minutes works.
Morning light is 100x more effective than afternoon light for circadian reset.
Miss this window and you lose 90% of the benefits.
Get sunlight within the first hour of waking. Even 10 minutes works.
Morning light is 100x more effective than afternoon light for circadian reset.
Miss this window and you lose 90% of the benefits.
2. Get the exposure right:
• Light skin: 10-15 minutes daily
• Darker skin: 25-40 minutes daily
• Face the sun directly. No sunglasses, no windows, no windshields.
• Your eyes need to detect the specific wavelengths (460-480nm).
• Light skin: 10-15 minutes daily
• Darker skin: 25-40 minutes daily
• Face the sun directly. No sunglasses, no windows, no windshields.
• Your eyes need to detect the specific wavelengths (460-480nm).
3. Location matters dramatically:
• Above 40° latitude = "Vitamin D winter"
• Boston: No vitamin D synthesis November-February
• Edmonton: October-March completely ineffective
This is why seasonal depression peaks at northern latitudes.
• Above 40° latitude = "Vitamin D winter"
• Boston: No vitamin D synthesis November-February
• Edmonton: October-March completely ineffective
This is why seasonal depression peaks at northern latitudes.
4. Never do this in evening:
Evening light exposure delays melatonin by hours and destroys sleep quality.
After sunset: dim lights only, blue light blockers, or you'll disrupt the entire cycle.
The timing is everything.
Evening light exposure delays melatonin by hours and destroys sleep quality.
After sunset: dim lights only, blue light blockers, or you'll disrupt the entire cycle.
The timing is everything.
The hormonal benefits are remarkable:
UV-B light → pituitary activation → 25% testosterone boost.
Vitamin D and testosterone peak together in August, crash in winter.
Plus: Creates T-cells that prevent autoimmune diseases.
UV-B light → pituitary activation → 25% testosterone boost.
Vitamin D and testosterone peak together in August, crash in winter.
Plus: Creates T-cells that prevent autoimmune diseases.
The results speak for themselves:
• 25% increase in testosterone levels
• 41% lower hypertension risk
• Fall asleep 22 minutes faster
• Enhanced immune function and mood
• Reduced autoimmune disease risk
• Longer life expectancy than sun avoiders
• 25% increase in testosterone levels
• 41% lower hypertension risk
• Fall asleep 22 minutes faster
• Enhanced immune function and mood
• Reduced autoimmune disease risk
• Longer life expectancy than sun avoiders
The research is clear: We evolved under the sun for millions of years.
Every cell has vitamin D receptors. Your skin has built-in UV sensors. Your eyes have specialized light circuits.
Modern indoor life has broken this ancient healing system.
Every cell has vitamin D receptors. Your skin has built-in UV sensors. Your eyes have specialized light circuits.
Modern indoor life has broken this ancient healing system.
How to start:
Week 1: 10 minutes outside after waking, no sunglasses
Week 2-3: Extend to 15-20 minutes based on skin type
Week 4+: Make it non-negotiable, even on cloudy days
Consistency beats intensity.
Week 1: 10 minutes outside after waking, no sunglasses
Week 2-3: Extend to 15-20 minutes based on skin type
Week 4+: Make it non-negotiable, even on cloudy days
Consistency beats intensity.
I've been doing morning sun exposure for years now.
The energy and sleep improvements are undeniable. It's the simplest biohack that actually works.
The energy and sleep improvements are undeniable. It's the simplest biohack that actually works.
Thanks for reading.
This was part 4 of my 50-part series on the best bio hacks based on the recent research to optimize your health.
If you enjoyed this post, follow @karlmehta for part 5.
Repost the first tweet to help more people see it:
This was part 4 of my 50-part series on the best bio hacks based on the recent research to optimize your health.
If you enjoyed this post, follow @karlmehta for part 5.
Repost the first tweet to help more people see it:
https://twitter.com/20891198/status/1951266796377612502
• • •
Missing some Tweet in this thread? You can try to
force a refresh
