TORONTO, June 7 /CNW/ - The Canadian Cancer Society is recommending a
specific amount of Vitamin D supplementation for Canadians to consider taking.
This first-time recommendation is based on the growing body of evidence about
the link between Vitamin D and reducing risk for colorectal, breast and
"The evidence is still growing in this area, but we want to give guidance
to Canadians about this emerging area of cancer prevention based on what we
know now," says Heather Logan, Director, Cancer Control Policy, Canadian
Cancer Society. "As we find out more we will update our recommendation."
In consultation with their healthcare provider, the Society is
- Adults living in Canada should consider taking Vitamin D
supplementation of 1,000 international units (IU) a day during the
fall and winter.
- Adults at higher risk of having lower Vitamin D levels should
consider taking Vitamin D supplementation of 1,000 IU/day all year
round. This includes people:
- who are older;
- with dark skin;
- who don't go outside often, and
- who wear clothing that covers most of their skin.
"We're recommending 1,000 IUs daily because the current evidence suggests
this amount will help reduce cancer risk with the least potential for harm,"
says Logan. "More research is needed to clearly define the amount of Vitamin D
that will maximize health benefits."
Logan explains that Canada's geographic location was a strong factor in
the Society's decision making about the recommendation.
"Where a person lives is one important factor in how much Vitamin D they
can produce from the sun. Because of our country's northern latitude, the
sun's rays are weaker in the fall and winter and Canadians don't produce
enough Vitamin D from sunlight during this time."
Research findings announced today add to the mounting evidence in this
area. A study published in The American Journal of Clinical Nutrition found
that taking Vitamin D supplements and calcium substantially reduces all-cancer
risk in post menopausal women. Specifically, the researchers found that the
higher the levels of Vitamin D in the blood, the lower the relative risk of
developing cancer. As well, another study released in May, suggests that women
who consume more calcium and vitamin D may be less likely to develop breast
cancer before menopause.
In addition to taking supplements, people can get Vitamin D by exposure
to the sunlight and in their diets. However, Logan cautions Canadians about
relying too much on getting Vitamin D through exposure to sunlight.
"It's important to remember that a few minutes a day of unprotected sun
exposure is usually all that is needed for some people to get enough Vitamin
D," says Logan. "It's not a good idea to rely solely on the sun to obtain
Vitamin D. For some people, it's possible that just a few minutes of
unprotected sun exposure every day could increase skin cancer risk."
Logan says a large-scale clinical trial would help provide more answers
about the amount of Vitamin D needed to maximize health benefits, and the
long-term risks, if any, of taking large doses of the vitamin.
"The Canadian Cancer Society is looking seriously at what we can do to
make this research happen. We will also be talking to our partners about this.
We need to keep building on our knowledge about this important area of cancer
More research is also needed about the amount of sunlight exposure needed
to achieve the optimum Vitamin D level.
The Society is not changing its SunSense guidelines, as skin cancer is
the most frequently diagnosed cancer in Canada. The Society recommends that
people reduce their exposure to the sun, particularly between 11 a.m. and
4 p.m. when the sun's rays are the strongest. Use a sunscreen with a sun
protection factor (SPF) 15 or higher and SPF 30 if you work outdoors or if you
will be outside for most of the day.
At this time, the Canadian Cancer Society does not have a recommendation
for Vitamin D supplementation for children. The research to date about the
role of Vitamin D and cancer prevention has focused on adults.
The Canadian Dermatology Association recently updated its recommendations
about Vitamin D supplementation. The association's website says: "In order to
lessen the health risks associated with skin cancer yet still reap the known
and possible benefits of Vitamin D levels take 1,000 international units of
Vitamin D supplements a day."
The Canadian Cancer Society is a national community-based organization
whose mission is to eradicate cancer and improve the quality of life of people
living with cancer. When you want to know more about cancer, visit our website
at www.cancer.ca or call our toll-free, bilingual Cancer Information Service
at 1 888 939-3333.
For further information:
For further information: Kerstin Ring, Senior Manager, Communications,
(416) 934-5664; French media, please contact: Alexa Giorgi, Bilingual
Communications Specialist, (416) 934-5681