Breast Cancer probability reduced 12 percent with daily hour of (outdoor) exercise – March 2014

Regular physical activity reduces breast cancer risk irrespective of age

Clipped from press release
Glasgow, UK: Practising sport for more than an hour day reduces the risk of contracting breast cancer, and this applies to women of any age and any weight, and also unaffected by geographical location, according to research presented to the 9th European Breast Cancer Conference (EBCC-9). Compared with the least active women, those with the highest level of physical activity reduced their risk of breast cancer by 12%, researchers say.

Professor Mathieu Boniol, Research Director at the International Prevention Research Institute, Lyon, France, reported to a press conference the results of a meta-analysis of 37 studies published between 1987 and 2013, representing over four million women. “These are all the studies looking at the relationship between physical exercise and breast cancer risk that have been published to date, so we are confident that the results of our analysis are robust,” he said.

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The press release did not mention if the exercise was outdoor or not

But a majority of sports are practiced outdoors
Outdoor exercise during the summer should increase the vitamin D levels enough to result in a 12% decrease in breast cancer

Note: getting lots of vitamin D should result in a 90% reduction in breast cancer

See also VitaminDWiki

• Walking an hour a day (more vitamin D) decreased chance of breast cancer by 14 percent – Oct 2013 appears to be a different study with similar conclusion
• Vitamin D Might Be Able to Slash Your Breast Cancer Risk by 90 Percent - Baggerly, Mercola: May 2013
• Why do gardeners live longer (vitamin D, etc.) gardeners probably also have a lower chance of breast cancer
• 60 minutes of sunlight needed to decrease vitamin D deficiency in sunny climate – Dec 2012
• UV, sunshine, and vitamin D (87 charts) - Holick March 2013
• Noontime sun and D category listing, with links to other categories and overviews
• Overview Breast Cancer and Vitamin D contains the following summary
• 25 Meta-analyses of Vitamin D and Breast Cancer
    example: 2X reduction of deaths from Breast Cancer if have enough Vitamin D.
• Appears that having lots of Vitamin D will reduce by 3 X the chance of Breast Cancer
     wonder just how much more proof is needed
• Breast Cancer 4X more likely if have poor genes
•     Cancer - Breast category listing has 259 items along with related searches
• Breast Cancer treatment – Vitamin D was the most-popular supplement – Jan 2023
• Breast Cancer again associated with low vitamin D – 15th meta-analysis Sept 2020
• Vitamin D reduced Breast Cancer mortality in 9 out of 9 studies, yet still no consensus – April 2019
• Vitamin D both prevents and treats Breast Cancer – 2019

See also web

• Physical activity and reduced breast cancer risk: a multinational study 2010
  35% reduction in Breast Cancer if just 1/2 hour per week of exercise Publisher charges $35 for the PDF
• a 2010 study is attached to the bottom of this page