Apparently, we women have to forget everything we ever knew about bras. If you think bras support your back, give you a better posture, or prevent your breasts from sagging, you may have to think again. The researcher in charge of a French study, has published his results, and they suggest that "wearing a bra does nothing to reduce back pain, and the chest supports actually cause increased breast sagging."
According to Rouillon, a sports science expert, the lesson to be learned from the preliminary results of his marathon experiment is that "bras are a false necessity".
"Medically, physiologically, anatomically - breasts gain no benefit from being denied gravity. On the contrary, they get saggier with a bra," [Source]
Again like most studies like this, there are limitations in sample size and selection. All the women involved in the study were aged between 18 and 35, and even Rouillon acknowledges that his less than a thousand group are not a representative of the global population of females. So if you're over 35 and live outside of France, this may not be applicable to you.
What do you think, time to throw away our bras? I do without bras sometimes because of my relatively itty-bitty breasts, though never when I'm dressed to go out formally, but what of the 50DDDs?