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Increasing bone mineral density increases breast cancer by at least 2X – Aug 2012

Osteoporosis Myth: The Dangers of High Bone Mineral Density Green Med Info

The following was clipped from the above item

One of the most important facts about bone mineral density, conspicuously absent from discussion, is that having higher-than-normal bone density in middle-aged and older women actually INCREASES their risk of breast cancer by 200-300%, and this is according to research published in some of the world's most well-respected and authoritative journals, e.g. Lancet, JAMA, NCI. (see citations below).

Observation by VitaminDWiki

Often times women have been told to take too much Calcium.
Without having Vitamin K2 Calcium is deposited in many places around the body other than bones.
Consuming more than about 2,000 IU of vitamin D daily increases the amount of Calcium that the body has to deal with.

See also VitaminDWiki