Everyone knows how crucial it is to get morning sunlight.
Huberman said it and now everyone follows without question.
No doubt, sunlight exposure is a top natural method for improving health.
But no one ever told us the science behind it.
Thus, let me introduce you to the science of the sun.
The Greeks thought the sun was Apollo's fiery chariot, travelling through the sky and giving life-giving light to the planet.
They believed Apollo was the god of medicine and healing, but he could also bring sickness.
Nowadays, scientists know that sunlight has both positive and negative effects on human health.
→ Let's start with the negative effects
Public health messages have mostly been about the dangers of too much sun.
UVA rays (95-97% of the UV rays that hit Earth) go deep into the skin and can cause skin cancer by creating DNA-damaging molecules like hydroxyl and oxygen radicals.
Sunburn is caused by too much UVB (ultraviolet B) radiation.
This form also leads to direct DNA damage and promotes various skin cancers. Both forms can:
• Damage collagen fibers
• Destroy vitamin A in skin
• Accelerate aging of the skin
• Increase the risk of skin cancers
Does this imply sun avoidance?
No, because the sun is more beneficial than detrimental.
→ The best-known benefit of sunlight is its ability to boost the body’s vitamin D supply.
Vitamin D deficiency is often because of insufficient sun exposure.
Turns out, 1,25-dihydroxyvitamin D3, the active form of the vitamin, regulates a whopping 1,000 genes that impact various tissues, including calcium metabolism and immune system functioning.
What about the vitamin D production?
Unlike other essential vitamins, which humans must obtain from food, the skin can synthesise vitamin D through a photosynthetic reaction when exposed to UVB radiation.
How efficiently we produce depends on how many UVB (ultraviolet B) photons get through...
• Clothing
• Excess body fat
• Sunscreen and melanin
Can all mess with that.
For most white people, a half-hour in the summer sun in a bathing suit can start the release of 50,000 IU (1.25 mg) vitamin D into the circulation within 24 hours of exposure.
This same amount of exposure yields 20,000–30,000 IU in tanned individuals and 8,000–10,000 IU in dark-skinned people.
When photosynthesis happens, it creates vitamin D3.
This gets transformed into 25-hydroxyvitamin D, which is the main form of vitamin D in your blood.
Doctors use this to check if you have enough vitamin D.
Another set of transformations occurs in the kidney and other tissues, forming 1,25(OH)D.
This vitamin is like a hormone, similar to the steroid hormones.
1,25(OH)D builds up in cell nuclei of the intestine, helping to absorb calcium and phosphorus.
It controls the movement of calcium in and out of bones to manage bone-calcium metabolism.
Vitamin D's primary job is to keep calcium and phosphorous levels in check so our bodies can function properly.
Without sufficient vitamin D, bones will not form properly.
In children, this causes rickets, a disease characterised by growth retardation and various skeletal deformities, including the hallmark bowed legs.
Now, here comes the most interesting part.
→ As diurnal creatures, we are programmed to be outdoors while the sun is shining and home in bed at night.
Therefore, melatonin is produced during the dark hours and stops upon optic exposure to daylight.
This pineal hormone is a key pacesetter for many of the body’s circadian rhythms.
It also plays an important role in fighting:
• Cancer
• Infection
• Inflammation
• Auto-immunity
When we are exposed to sunlight or very bright artificial light in the morning, our nocturnal melatonin production occurs sooner, and we enter sleep more easily at night.
Melatonin production changes with the seasons.
It's made more in the winter than in the summer.
Exposing yourself to bright morning light can help with insomnia, PMS, and SAD (seasonal affective disorder).
→ The melatonin precursor, serotonin, is also affected by exposure to daylight.
Normally produced during the day, serotonin is only converted to melatonin in darkness.
High melatonin levels = long nights and short days
High serotonin levels (in the presence of melatonin) = short nights and long days (longer UVR exposure).
Higher serotonin levels promote positive moods and mental clarity.
Indeed, SAD has been linked with low serotonin levels during the day and with a phase delay in nighttime melatonin production.
With our modern-day penchant for indoor activity and staying up well past dusk, nocturnal melatonin production is typically far from robust.
The light we get from being outside on a summer day can be a thousand times brighter than we’re ever to experience indoors.
For this reason, it’s important that people who work indoors get outside periodically, and that we all sleep in total darkness.
This can have a major impact on melatonin rhythms and can cause improvements in mood, energy, and sleep quality.
If you get little sunlight at work, full-spectrum lighting could be useful.
Sunglasses might keep your eyes from getting all the sunlight, which could mess with your melatonin.
Ditching the shades in the daylight, even just for 10-15 minutes, could do wonders for your health.
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10 lessons from John Maxwell's book Success Is a Choice: Make the Choices that Make You Successful:
1. Believe in yourself. The first step to success is to believe in yourself and your ability to achieve your goals. If you don't believe in yourself, no one else will.
2. Fire up your passion. When you're passionate about what you're doing, you're more likely to be successful. Find something that you're passionate about and pursue it with all your heart.
3. Initiate action. Don't just sit around and wait for things to happen. Take action towards your goals every day.
4. Focus your energy. Don't try to do too many things at once. Focus your energy on the most important things that will help you achieve your goals.
5. Develop good relationships. Relationships are essential for success. Build strong relationships with people who can support you and help you achieve your goals.
6. Embrace practice. The more you practice, the better you will become. Practice your skills on a regular basis.
7. Persevere through setbacks. Everyone experiences setbacks from time to time. Don't give up on your goals when things get tough. Persevere through the setbacks and keep moving forward.
8. Learn from your mistakes. Everyone makes mistakes. The important thing is to learn from your mistakes and move on.
9. Celebrate your successes. Take the time to celebrate your successes along the way. This will help you stay motivated and keep moving forward.
10. Give back to others. Once you've achieved success, give back to others and help them reach their goals.
Maxwell's book is a powerful and inspiring guide to achieving success. It is a must-read for anyone who wants to live a more fulfilling and successful life.
Here is an additional lesson from the book:
• Be grateful. Take the time to be grateful for what you have. Gratitude will help you stay positive and motivated on your journey to success.
I hope these lessons are helpful. Good luck on your journey to success!
BOOK: https://amzn.to/49zsPv2
You can also get the audio book for free using the same link, as far as you are registered on the Audible Platform.
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