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The world’s
leading vitamin D experts gathered together in San Diego this month
calling for health officials to take a balanced approach to UV light
policy.
There are two conflicting views on sun
exposure. On the one side are dermatologists, skin cancer organizations
and public health groups who have been advising the public to stay out
of the midday sun, or to use sunscreen, daily, to reduce the risk of
skin cancer. On the other side are vitamin D advocates, scientists and
doctors who believe that sensible, non-burning sun exposure helps you
achieve adequate vitamin D levels, which reduces your risk of a number
of serious diseases without increasing your risk of skin cancer.
The release of the video coincided with the
kickoff of the Vitamin D for Public Health 2-day seminar in San Diego
hosted by GrassrootsHealth and UC San Diego. Seminar attendees heard
from Dr. Robert Heaney and Dr. Michael Holick, featured in the video,
and other experts on the importance of sun exposure for maintaining
optimal levels of vitamin D necessary for human health.
In the video, Dr. Robert Heaney, John A
Creighton University Professor Emeritus, addresses a question on the
natural way to make vitamin D, “The most natural way to make vitamin D
is to expose our skin to the sun particularly around midday when the
intensity of the sun’s rays will be at their maximum, particularly in
the summertime.”
Another important question addressed in the
video is, can sunbeds be used to make vitamin D, especially in winter?
“Sunbeds of course can be used to make vitamin D. It has been one of the
ways that we have measured the amount of vitamin D that the skin has
the capacity to make,” stated Dr. Reinhold Vieth, a professor at the
University of Toronto in the Department of Laboratory Medicine and
Pathobiology.
“Tanners actually have robust levels of
vitamin D,” stated Dr. Michael Holick, Professor, School of Medicine,
Endocrinology, Diabetes & Nutrition, Boston University.
It’s the UVB rays in ultraviolet light that
makes vitamin D in your skin. Sunshine at midday in summer is typically
composed of 95% UVA and 5% UVB. The small amount of UVB is all it takes
to make vitamin D in your skin. This occurs when the UV index is above 3
and your shadow is shorter than your height. During spring/summer the
best time to make vitamin D is between 10 am and 2 pm. During the
fall/winter months UVB rays do not reach the earth above a latitude of
roughly 34 degrees (Los Angeles, CA and Atlanta, GA), so much of the
United States and Canada enters a “vitamin D winter” where no vitamin D
will be made, regardless of the time of day.
“The good news is that there are many benefits
to sunlight besides making vitamin D. Vitamin D is made by a narrow
band of the sun’s radiation and there are many other regions in that
visible light that produce all kinds of good effects. It is good for the
spirit. It raises our happiness, it decreases our blood pressure, it
promotes lots of things that are healthy for us. Vitamin D just happens
to be the one we are most concerned about now because vitamin D
deficiency is so common in the populations of industrialized nations,”
reported Dr. Heaney.
