START A PETITION 27,000,000 members: the world's largest community for good

How Sunlight Could Prevent Alzheimer’s and Cancer

  • 1 of 2
How Sunlight Could Prevent Alzheimer’s and Cancer

In part one of this series on Vitamin D, Dr. Frank addresses the epidemic of vitamin D deficiency: 30 to 100 percent of Americans don’t get enough of this crucial hormone. This deficiency can play a role in almost every major disease including 17 kinds of cancer, MS, Parkinson’s and Alzheimer’s. He explains that since only about 10 percent of vitamin D comes from diet, the two best sources are the sun and supplements. In part two, Dr. Frank advises us on how to tell if we are vitamin D deficient. In this post, Dr. Frank addresses vitamin D toxicity, tanning beds and more. 

My Doctor told me to avoid the sun, what do you think?

There is an old Italian saying “Where the sun does not go the doctor does.”

For about the last 25 years, doctors (dermatologists in particular) have demonized sun exposure and repeatedly told us it is bad for you and causes cancer. But is that true? In the last few years, numerous studies have shown that modest exposure to sunlight may actually be good for you, helping the body produce the vitamin D it needs to keep bones healthy and protect against cancer, including skin cancer. Though repeated sunburns–in children and very fair-skinned people–have been linked to melanoma, there is no credible scientific evidence that moderate sun exposure causes it. Since it’s almost impossible to get adequate amounts of vitamin D from food alone (including fortified milk and fatty wild fish), sun is your best source. I’m not suggesting you go bake in the sun with your suntan oil or go to tanning salons. But getting some sun without getting sunburned makes healthy sense. We evolved in the sun; we were made to get some sun, not to live our lives indoors and slather on sunscreen every time we go outside. If the sun is shining where you are today, get out and enjoy it, talk about a free natural treatment! All you need is a little common sense when heading outdoors, do it gradually and always avoid sunburn. Special Note: Remember to take antioxidants when you sit in the sun, as these can help prevent skin cells from sun damage.

How much sunshine do you need?

All living things need sun, the key is balance. Too much sun exposure can cause melanoma and skin aging, while too little creates an inadequate production of vitamin D. The amount needed depends on the season, time of day, where you live, skin pigmentation and other factors. As a general rule, if you are not vitamin D deficient, about 20 minutes a day in the spring, summer and fall on your face and arms or legs without sunscreen is adequate. It doesn’t matter which part of the body you expose to the sun. Many people want to protect their face, so just don’t put sunscreen on the other exposed parts for those 20 minutes.

If you live north of 37 degrees latitude (approximately a line drawn horizontally connecting Norfolk, Virginia to San Francisco, California) sunlight is not sufficient to create Vitamin D in your skin in the winter months, even if you are sitting in the sun in a bathing suit on a warm January day! The further you live from the equator, the longer exposure you need to the sun in order to generate vitamin D.

What about the use of tanning beds to get my vitamin D?

I tend not to recommend them because we don’t really know if they are safe. Because the light sources vary with different tanning beds, it makes them unpredictable and possibly unsafe. In addition, most commercial tanning beds emit an unknown amount of EMF and because one is so close to the actual bed, it may be an unnecessary high dose. Theoretically both these problems could be overcome, but in reality they usually are not.

Can I take cod liver oil to get my vitamin D?

Although Cod liver oil contains a fair amount of vitamin D, it also contains high amounts of vitamin A. Vitamin A antagonizes the action of vitamin D and can be toxic at high levels.

Next: What are food sources of vitamin D and what about vitamin D toxicity?

  • 1 of 2

Read more: Conditions, Diet & Nutrition, Health, , , , , , , , , , ,

have you shared this story yet?

go ahead, give it a little love

Dr. Frank Lipman

Founder and director of the Eleven Eleven Wellness Center in New York City, Dr Frank Lipman is a pioneer and internationally recognized expert in the fields of Integrative and Functional Medicine. His personal brand of healing has helped thousands of people reclaim their vitality and recover their zest of life. To hang with Frank, visit his blog, follow him on Twitter or join his Facebook community today.


+ add your own
4:46AM PDT on Oct 5, 2012

I always feel better on sunny days and like to be outside. In the spring, summer and in the fall, that's easy to do. But, on sunny days in the winter with snow & ice on the ground, I don't get out too much!! I'll have to get some Vitamin D tablets.

12:33AM PST on Mar 5, 2011

Thanks for the article.

5:53AM PST on Mar 3, 2011

I try to go out doors each day, but of course I use sun protection cream all year round! I try to balance this by taking Vit. D tablets.

5:33AM PDT on Jun 2, 2010

When you live in countries with extremely high u/v levels, like here, in Australia ( and as Sa R noted.. Israel!) it is a bit hard to really know what you are doing! I realize that SOME sunshine is good, but many of us, who HAVE to be out in the midday sun, are being slowly fried by the sun, even when you are exposed for just a short period of time. Some day, you go out into the sun and in one or two minutes, you feel as if you are being slowly roasted in an oven!As we have about the highest levels of skin cancer in the world, it is going to be rather difficult to persuade people to quit using their sunscreen and get back out into those rays! There has been so much media coverage of the dangers of exposure to the sun, that maybe we need to have more articles like this, to make us re-think the knowledge we have had drummed into us! It is certainly food for thought. I think I think maybe I will chicken out and use a mineral sunscreen and delve into that pot of D3, just in case the scientists change their minds again!

6:23AM PST on Jan 30, 2010

i've noted, thanks a lot :).

5:57PM PST on Jan 28, 2010


12:47PM PST on Jan 3, 2010

I love this article. Thank you.

7:13PM PST on Dec 27, 2009

Its always about moderation.
No matter what it is. To much of anything is bad for us.

7:13PM PST on Dec 27, 2009

Its always about moderation.
No matter what it is. To much of anything is bad for us.

2:35AM PST on Dec 22, 2009

hopefully this is the cure to stop cancer and protect many peoples lifes

add your comment

Disclaimer: The views expressed above are solely those of the author and may not reflect those of
Care2, Inc., its employees or advertisers.

people are talking

Thank you.

Thank you.

It's good to not take the end of a relationship personally. Nothing wrong with being in love, and t…


Select names from your address book   |   Help

We hate spam. We do not sell or share the email addresses you provide.

site feedback


Problem on this page? Briefly let us know what isn't working for you and we'll try to make it right!