Vitamin D
We are at the height of Summer, and it is prime time to take advantage of the Sun and its incredible ability to give us the “sunshine” vitamin. It’s an intricate and miraculous interplay of Helios’ UV rays with our largest organ, the skin. The team behind converting sunshine into vitamin D also includes the liver, the kidneys, and cells.
What Does Vitamin D Do?
Here’s a partial list:
Bone health ~ prevents osteoporosis, osteomalacia, and rickets
Autoimmune diseases ~ decrease the risk of rheumatoid arthritis, multiple sclerosis, and Type 1 diabetes
Mental health ~ improves SAD (Seasonal Affective Disorder), depression, and for females, PMS
Cancer prevention ~ shown to decrease the risk of breast, prostate, and colon cancers
Vitamin D Deficiency Symptoms
And here’s a list of symptoms to look out for that signal deficiency:
Osteoporosis and Osteomalacia
17 varieties of Cancer (including breast, prostate, and colon)
Heart disease
High blood pressure
Obesity
Metabolic Syndrome and Diabetes
Autoimmune diseases
Multiple sclerosis
Rheumatoid arthritis
Osteoarthritis
Bursitis
Gout
Infertility and PMS
Parkinson’s Disease
Depression and Seasonal Affective Disorder
Alzheimer’s Disease
Chronic Fatigue Syndrome
Fibromyalgia
Chronic Pain
Periodontal disease
Yet, despite irrefutable evidence that we need sunlight, lack of vitamin D has reached epidemic proportions in the 21st century, brought on by a combination of:
Sun phobia. For decades, the people who make suntan lotions have scared the living daylights out of us regarding sun exposure and skin cancers. As a result, babies and adults slather on suntan lotions, which prevent the skin from absorbing the necessary UVB radiation to produce vitamin D. Please note that sun protection is essential. Still, to obtain precious vitamin D from the sun, we need to expose unprotected skin for a short time to absorb the UVB rays.
Long hours spent indoors in front of computers, TV screens, and game consoles.
Poor diets lacking in vitamin D have led to an increase in the incidence of digestive problems. This includes IBS (Irritable Bowel Syndrome) or gastric reflux, both of which can prevent optimal vitamin D absorption through food or supplementation.
Hey, and if you engage in all three vitamin D-depleting activities, then chances are you, too, may be deficient in D.
A Little Sunshine Science
Sunlight is composed of electromagnetic radiation of varying wavelengths, including ultraviolet (UV) radiation: UVA, UVB, and UVC. The last is completely destroyed by the atmosphere, so we are only affected by UVA and UVB, which act differently on us. UV is the one that gives us wrinkles, and in very high doses, can lead to cancerous melanomas. UV is what causes skin to burn if overexposed to sunlight, and may lead to non-melanoma skin cancer over time. However, UVB is also what stimulates the skin to produce our beloved and vital vitamin D.
The most crucial point to keep in mind is that there is a significant difference between safely exposing yourself to acquire healthy levels of vitamin D and overexposing yourself to the point of scorching your skin and creating risk factors for skin cancer.
The amount of sun-sourced vitamin D you get depends on your location and time of year. If you live in mid-latitudes (35°–50°), cities such as New York, San Francisco, and Boston, there is no UVB available during November through February so that supplementation would be a good idea. For the rest of the year, and especially during the summer, get bare and get safe sun.
How Much Sun Exposure Is Safe?
Here is “The Horlick Formula for Safe Sun” created by Dr. Michael Horlick, a renowned vitamin D researcher and author of The UV Advantage.
Expose 25 percent of your body’s surface area to 25 percent of *1MED two to three times per week, without sunscreen, during all times of the year when UVB rays are available where you live. 1D just means one minimal erythemal dose, which in plain English is the amount of time it takes for you to get a mild sunburn without sunscreen.
Wait, don’t be confused! It is relatively simple when you do some easy math and locate your coordinates.
So, here’s an example of how you do it according to Dr. Horlick’s Formula for Safe Sun:
Go outside in your shorts or bathing suit (ideally before 10 AM or after 2 PM), without sunscreen, and see how long it takes for your skin to get mildly pink. This is your 1MED.
After that, either return indoors or apply a full-spectrum sunscreen.
Multiply your 1MED by 25%. For example, if it took 15 minutes for you to turn pink, or 1 MED, 15 multiplied by 0.25, gives you approximately 3.75 minutes.
Now get out and enjoy the sun with up to 50% of your body exposed (this means exposing your face, hands, and arms, or arms and legs) for about 4 minutes, two to three times per week, when UVB rays are available where you live.
(After the desired exposure time to get your vitamin D, use a full-spectrum suntan lotion if you want to stay out longer.)
According to Dr. Horlick, this method will provide you with approximately 1,000 IU of vitamin D. The more skin you expose, the more vitamin D you will make. Keep in mind that although 1,000 IU is a good amount, individual needs differ significantly, and the optimal amount you require per day depends on your existing vitamin status, and also on the amount of vitamin D in your diet.
I highly recommend that you get Dr. Horlick’s book, The UV Advantage. It is easy to read and includes valuable information on how vitamin D prevents diseases, the truth about suntan lotions and skin cancer, and how to get adequate vitamin D through supplements or indoor tanning. Please note that it has a super-nifty chart on when and where to get the best exposure to UVB.
Your ally in health,
Karen
References:
Horlick, Michael. The UV Advantage. Ne York: ibooks, Inc. 2003.
Tavera-Mendoza, Luz., White, John H. Cell Defenses and the Sunshine Vitamin. Scientific America, p. 62 – 72, November 2007.
Wehr, E., Pilz, S., Boehm, B. O., März, W. and Obermayer-Pietsch, B. (2010), Association of vitamin D status with serum androgen levels in men. Clinical Endocrinology, 73: 243–248. doi: 10.1111/j.1365-2265.2009.03777.x