The Sunny
Truth
With
springtime here and summer time right around the corner, many people are once
again becoming concerned about exposure to sunlight, but the latest research
may really surprise you.
A recent study
by researchers at the University of California found that solar ultraviolet B
(UVB) radiation can significantly reduce the risk of 16 different types of
cancer by naturally stimulating the production of vitamin D in the skin. The
study's authors are Cedric F. Garland, Dr.P.H., from the Department of Family
and Preventive Medicine at the University of California, San Diego, and William
B. Grant, Ph.D., director of the Sunlight, Nutrition and Health Research Center
(SUNARC) www.sunarc.org/about.htm
"Enhancing
vitamin D status appears to be the single most important simple thing people
can do to reduce their risk of cancer, apart from avoiding tobacco and
moderation in the intake of alcohol," say Cedric Garland and William
Grant.
It has been
frequently reported that those who work outdoors have a reduced risk of
developing melanoma [Garland et al., 1990; Kennedy et al., 2004]. The reasons
appear to be twofold:
- They develop a tan that blocks the penetration of
ultraviolet radiation so it can't produce the free radicals that can lead
to melanoma.
- They produce lots of vitamin D.
The
researchers recommend that people get their vitamin D from exposure to natural
sunlight. Fair-skinned people who live in sunny regions of the country can
produce about 1,500 IU of vitamin D in 20 minutes of exposure at noon if only
10 to 20 percent of their body is exposed -- such as chest, back and arms.
People should try to expose more of their skin surface for a shorter amount of
time, rather than stay in the sun longer with minimal skin exposure, the study
says. Darker-skinned people may need up to four times as long to make the same
amount of vitamin D as fair-skinned people.
The study
recommends wearing hats to avoid prolonged sun exposure on more sensitive parts
of the body, such as the face, and to keep moving when in the sun. Garland and
Grant caution fair-skinned people to avoid over-exposure, since the skin
produces sufficient vitamin D in just 20 minutes a day.
A new and gathering body of evidence seems to indicate that the benefits of
sunlight, in general, greatly outweigh the risks. So grab a bag of your
favorite Wholefood Farmacy food, take a walk in the park, and make a little
sunshine a part of each and every day.
Visit The
Wholefood Farmacy