Sun and a vitamin D-rich diet reduce the risk of breast cancer by up to 43 percentAttested by a study among 70.000 women: the crucial aspect is sufficient UVB radiation; diet or food supplements merely have a supporting function.
Regular sun exposure and a vitamin D-rich diet reduce the risk of developing breast cancer by around 32 to 43 percent. The deciding factor in prevention is exposure to adequate UVB rays. Admittedly food that is rich in vitamin D, such as fish, dairy products, eggs and certain types of oils or food supplements, can boost the effects of the sun, but used alone they have little effect on the occurrence or progression of the disease. These are the findings of researchers from the French National Institute for Health and Medical Research (Institut National de la Santé et de la Recherche Médicale[INSRM]) in Paris, obtained during a study published in the professional journal “Cancer Epidemiol Biomarkers”.
In this study, scientists observed around 70,000 women over a period of ten years. During this period, 2,871 cases of breast cancer were diagnosed. According to the study, women who live in sunny regions such as Provence and who eat a vitamin D-rich diet have a far lower risk of developing breast cancer than women who have less sun exposure, who live in cloudier areas and who ingest less vitamin D through their food or food supplements.
The conclusion of the research group: “A high dose of vitamin D via exposure to sunlight and nutrition is necessary in order to obtain a sufficient protective effect against breast cancer. However, this value is very difficult for women to achieve in northern countries as the sunlight in these regions is not strong enough to ensure a sufficient supply of vitamin D.”. Furthermore, the scientists explain, following the menopause it is far more difficult to achieve the protective effect from the combination of sun and a vitamin-D rich diet.
Pierre Engel, Guy Fagherazzi, Sylvie Mesrine, Marie-Christine Boutron-Ruault, Francoise Clavel-Chapelonet: “Joint Effects of Dietary Vitamin D and Sun Exposure on Breast Cancer Risk: Results from the French E3N Cohort”; in: Cancer Epidemiol Biomarkers Prev 2011;20:187-198. Published Online First December 2, 2010
The Sunlight Research Forum (SRF) is a not-for-profit organisation based in The Netherlands. SRF’s aim is to help bring to the fore, the latest medical and scientific information on the effects of moderate UV exposure on man. It takes time, often decades, for new scientific ideas to be accepted and assimilated, first into the general body of scientific knowledge and finally into policy. We want to reduce this time to a minimum so that the benefits of research can lead to a better understanding of UV effects on man and will become available to the public without any unnecessary delay. We hope to provide policy makers with correct information on which to base national health policy and individuals with better information on which to base choices about their lifestyles.
New research and well founded ideas on moderate UV exposure both indoor and outdoor will be presented and discussed in the Sunlight Research Forum by people working in the health disciplines, by academics and by journalists.
Sunlight Research Forum (SRF)
P.O. Box: 71
5500 AB Veldhoven,
Tel.: +31(0)651 358 180
Fax: +31 (0)40 205 1967
Sunlight Research Forum (SRF)
P.O. Box: 71
5500 AB Veldhoven,
Phone: +31(0)651 358 180
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