How Much Sun is Too Much?

Is Sunlight Dangerous?
For the past 50 years, doctors say we should NEVER be in direct sunlight or risk skin cancer. As a child I basked all summer with no sunscreen. I got sunburns, peeled, and went out again. Basal cell spots taught me a lesson – but what’s the lesson? Maybe it’s not so simple and one-dimensional as “Sunburn causes Cancer”. What if skin cancer is caused by SOMETHING ELSE or has SEVERAL CAUSES? And what’s a good rule on SENSIBLE sun exposure?

Surprising research shows that women who get regular sunlight have a lower death rate than those who avoid it, perhaps due to higher vitamin D levels? Most studies show that SENSIBLE sun exposure at non-peak hours can be extremely beneficial. Indeed it is necessary for your health.

Benefits of Sun Exposure
Sadly, studies that link sun exposure to skin cancer tend to disregard the benefits of sunshine on the human body. What are the benefits of sunlight? Professor Michael Holick, of Boston University School of Medicine and author of the book “The UV Advantage” says:

“We get about 90 – 95 % of our vitamin D from the sun. Sunshine is essential for healthy immunity, for absorbing calcium, keeping bones healthy, and for protecting against chronic diseases such as osteoporosis, Diabetes, MS, and many common cancers.”

He advises that we should go out in the sun without sunblock for 5 to 15 minutes a day to boost our vitamin D levels.

Another groundbreaking study published in the Journal of Internal Medicine showed sunlight deficiency is as damaging to your health and life expectancy as being an active smoker!  

Astonishingly, the study found: “Compared to the highest sun exposure group, life expectancy of avoiders of sun exposure was reduced by 0.6-2.1 years.”

We know ONE reason why sunlight is such a ‘life-saver,’ namely, UVB rays (the one’s found primarily in the middle of the day, when the sun is at its strongest) help our body produce vitamin D sulfate (an exceptionally volatile and therapeutic form of vitamin D not found in supplements), which literally thousands of genes and hundreds of metabolic pathways within our body depend on to function optimally.

Yet, in this day age, the majority of the population’s primary source of light exposure is from artificial sources, which are heavy on blue light and have none of the healing effects of the UVB wavelengths. Not only that, but the blue light itself has been newly identified as a form of “digital stress” which causes cosmetic damage due to chronic exposure to blue light.

In this respect, blue light has adverse effects to human skin similar to radiation exposure we get from excessive sunlight through UVA rays. (Source: GreenMedInfo Daily Newsletter July 11th, 2023)

Lack of Sunlight and Vitamin D is a global epidemic. 

Low Vitamin D levels have been linked to chronic illnesses such as cardiovascular disease and depression. Tuberculosis, which kills 4,100 people per DAY around the globe, has been directly linked to Vitamin D deficiency!

Researchers estimate that 50% of the general US population is deficient in vitamin D deficiency. Signs you may have a vitamin D deficiency include age over 50, having darker skin, obesity, achy bones, feeling blue, sweaty head, and gut trouble. Increased levels of sunlight or vitamin D3 could prevent chronic diseases that take nearly one million lives in the world each year.

Ironically, recent research shows that vitamin D also improves survival outcomes for melanoma patients. Vitamin D is also important for cognitive health, immune function, healthy pregnancy and infant development, and strong, healthy bones, just to name a few. Doctors can often be torn on recommending time in the sun, when both too much and too little sunlight can have consequences.

A recent news report noted:

“15 to 20 minutes in sunlight a day helps your body produce the vitamin D it needs to absorb calcium, promote bone growth and keep the heart healthy. But sunscreen protection against skin cancer reduces the body’s ability to manufacture vitamin D.”

A Swedish Study Says: “Sunlight Lowers Overall Risk of Death”

A recent study in Sweden discovered major benefits of sunlight. More than 25,500 Swedish women between the ages of 25 and 64 were followed for 20 years. Detailed information about sun exposure habits and confounding factors were obtained and analyzed in a “competing risk” scenario.

Overall, the women who got regular sun exposure had a lower all-cause mortality risk—likely due to their increased vitamin D levels. Women with active sun exposure habits ended up having a lower risk of cardiovascular disease and non-cancer death compared to those who avoided the sun. Of particular note is this finding:

 “Nonsmokers who avoided sun exposure had a life expectancy similar to smokers in the highest sun exposure group, indicating that avoidance of sun exposure is a risk factor for death of a similar magnitude as smoking.”

Skin Damage Depends on Sun Intensity and Time of Day.
The peak time of sunshine around 12:00 noon can give you a serious burn. On the other hand in the morning or evening, the sun’s rays are at a much greater angle. Sunlight is filtered through thousands of miles of atmosphere in the morning and evening, so these rays are less likely to cause damage.

SunburnRisk of sunburn and skin cancer is highest at 12:00 noon, lowest in morning and evening.

Low Latitudes Increase Intensity of Rays
Are you in Sao Paolo or Toronto? Near the equator the sun’s rays are more direct, and you’re more likely to have skin damage. However in Toronto your risk is less, because the sun’s rays are hitting you from an angle, being filtered by atmosphere.

Risk of sunburn and skin cancer is highest when the sun is directly overhead, such as at the equator at 12:00 noon.

General Guidelines for Sensible Sun Exposure – For USA or similar latitudes:

Here are my recommended limits for sunbathing at different times of days and seasons. I used a combination of research and medical intuition to arrive at these numbers. I can’t guarantee these are correct for everyone, however they may be a useful guide for you.


What are the Medical Benefits of Sunlight?

  1. Sunlight builds Vitamin D levels for healthy immunity. Studies show that most people living in the USA and Europe are Vitamin D deficient. An hour a day outsied is a healthy way to avoid this altogether. However during the winter months, supplements are necessary.
  2. Sunlight Kills Depression – Getting out in the sun dissolves depression by boosting levels of serotonin, especially when combined with exercise
  3. Sunlight Prevents Diabetes, which is often linked to low Vitamin D. A Finnish study found that children given Vitamin D had an 80% lower risk of diabetes in later life.
  4. Sun Heals SAD, Seasonal Affective Disorder – Real sunlight beats a light box, and walking outside at sensible hours does wonders for your health.
  5. Sun Exposure Reduces Risk of Heart Disease and High Blood Pressure – The British Medical Journal found that the amount of sunshine you get, and even the place you live, have a big effect on your risk of cardiovascular diseases and high cholesterol. For every one skin cancer death in northern Europe, between 60 and 100 people die from stroke or heart disease, related to hypertension!
  6. Sunlight may lower your chance of getting of MS – People in sunnier countries have a much lower incidence of MS.
  7. Sunlight reduces the risk of cancers – Even though sun increases the risk of skin cancer, overall sensible exposure to sun can significantly reduce your chances of dying from breast or colon cancer, says a study by the US National Cancer Institute.
  8. Improves Crohn’s Disease and IBS, Irritable Bowel Syndrome – Both of these are linked to low Vitamin D levels.
  9. Should You Supplement with Vitamin D?
    Yes, if you live in a low-sun area of the world or can’t go outside, taking oral vitamin D is important. But many experts say this is clearly an inferior alternative. Some supplements are better than others. While taking oral vitamin D may improve your status, you will miss all the other many benefits that sunlight offers.

Researcher Richard Weller says:

“We suspect that the benefits to heart health of sunlight will outweigh the risk of skin cancer. The work we have done provides a mechanism that might account for this, and also explains why dietary vitamin D supplements alone will not be able to compensate for lack of sunlight.”

Sunlight – A Healthy Alternative to Coffee?
My personal experience is that sunlight is a beautiful way to enliven your body. Whether taking a walk, or doing yoga in the buff, I notice a definite sense of uplift and vitalization. Just 10 minutes total of full body sun bathing beats a cup of coffee any day. I do 5 minutes face up, 5 minutes face down, and shift my body lengthwise every few minutes so I’m getting all sides. It feels wonderful and your senses will love it!

Sunscreen: More Harm than Good?
I do not use sunscreen. Instead I wear long sleeves, high collar, and a big hat! Sunscreens are a huge question mark for all of us. The Environmental Working Group’s (EWG) guide to safe sunscreens includes their review of over 2000 sunscreens and over 257 brands. They found more than 75% of the sunscreens studied contained toxic chemicals that can increase your risk of cancer and other health issues. Eeek! The EWG says:

 Our review…shows that some sunscreen ingredients absorb into the blood, and some have toxic effects. Some release skin-damaging free radicals in sunlight, some act like estrogen and disrupt hormones, and several can cause allergic reactions and skin irritation. The FDA has not established rigorous safety standards for sunscreen ingredients.

Sunglasses – Do you really need them?
There are over 1,500 wavelengths of light that you need to nourish your eyes. On an average sunny day, sunglasses do your eyes more harm than good. Sunglasses block potentially beneficial wavelengths of light from reaching your eyes. So I avoid using sunglasses, because I believe our eyes need a full spectrum of light to function optimally, and sunglasses block out some of those essential waves of the light spectrum. If your eye muscles don’t respond to changes in the light, then of course clearly you need sunglasses.


Take off your sunglasses too, honey! The best way to get exposure to healthy full-spectrum light is to do it the way nature intended, by going out in the sun with your bare skin on a regular basis.

Your Eyes Need Exposure to Bright Light During the Day
Sunglasses are useful when you’re skiing, or driving into the direct sun. However your eyes need to be used and moved in normal light, allowing the pupils to expand and dilate with changing intensities of light. Be careful about over-shielding your eyes from sunlight, because the full-spectrum light entering your eyes, goes into your brain hypothalamus where it benefits your whole body. Your hypothalamus is an essential endocrine glad that controls body temperature, hunger, thirst, water balance and blood pressure. Additionally, it controls your master gland, the pituitary, which secretes many essential hormones, including those that influence mood. Your ‘body clock’ is housed in the hypothalamus, controlling circadian rhythm, that all-important awareness of time. Full-spectrum light is a very effective therapy often used for treating depression, inflammation, and more.

Anything that disrupts these essential biorhythms, such as inadequate sunlight to your body (including your eyes), has a far-reaching impact on your health. So take off your clothes and your sunglasses. Enjoy sensible sun by the above guidelines, and feel the difference in your health!


Melanoma risk: Sun exposure prevents it!

Sunlight: The Greatest Multivitamin

Sunlight and Melanoma

1 Reply to "How Much Sun is Too Much?"

  • comment-avatar
    Bethany August 1, 2023 (4:44 pm)

    Jane i am so glad i found your site! This article was amazing and i can’t wait to show it to my family !!!!

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