Time to burn your bras? A 15-year study out of France has found bras do not help with back pain and can even lead to saggy breasts over time. "Bras are a false necessity," says researcher Jean-Denis Rouillon, who monitored the breasts of 330 women over 15 years and found little support for the assumed benefits of a bra. The findings suggest that bras prevent natural growth of breast tissue and in a way make our breasts lazy. When the women in the study ditched their bras, they gained a 7-mm lift each year on average. Do these findings intrigue you?