I was searching for something else and came across this, it makes for intersting reading!
Health article index >>
Burn Your Bra, Revisited
A new study shows that wearing a bra is linked to higher incidence of breast cancer. Women who wear a bra 24 hours a day are 125 times a likely to develop cancer as women who don1t wear one at all, according to medical anthropologists Sydney Ross Singer and Soma Grismaijer. In a study involving 4,700 women, those who never wore a bra had the same incidence of breast cancer as men a rare condition. Women who worebras for more than 12 hours but did not sleep in them had 21 times the risk as women who wore a bra for less than 12 hours.
It is postulated that lymphatic vessels are blocked by the bra, keeping lymphocytes (white blood cells) from their role in destroying abnormal cells, and leading to malignancies. However, even without knowing the exact mechanism, the correlation is significant: 4 to 12 times as great as the connection between smoking and lung cancer. Singer and Grismaijer's book, Dressed to Kill: The Link Between Breast Cancer and Bras, elaborates on their research.