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Will bras keep the breasts from sagging?
Bras will keep your breasts from sagging while you're wearing them - but not for the remainder of time. There is no published medical literature showing that bras prevent sagging. Even the bra industry seems to know this, as the following quote illustrates:
"We have no evidence that wearing a bra could prevent sagging, because the breast itself is not muscle, so keeping it toned up is an impossibility. What it can do, particularly for larger-breasted women, is obviously to provide the comfort and the support. So, if a woman wants a particular breast profile, she will buy a particular brand, and that is what they're designed for. There's no permanent effect on the breast from wearing a particular bra. The bra will give you the shape the bra's been designed to give while you're wearing it. Of course, when you take it off, you go 'au natural.' "
executive John Dixey at Bras, Bare Facts documentary
However, there is some support for the idea that breasts in bras actually sag more (when bra is taken off). How could that be since the main idea of bras is to lift the breasts upward? The main idea is that theligaments which support breasts in normal circumstances, would atrophy (get thinner and weaker) when breasts are immobilized within bras and don't have to bear their own weight.
There are lots of studies showing that ligaments and tendons in limbs do atrophy when the limb is immobilized. Bras obviously prevent the the natural slight up-down movement of breasts when we walk, and let shoulders bear the weight of breasts. If breast ligaments behave like limb ligaments, it may be a matter of "use it or lose it".
One study published on the subject of bras and sagging was done in 1991, in Japan. The study suggests that a bra can actually increase breast sagging rather than the opposite
Sports bras and jogging
There is one more notable study concerning sagging and bra wearing, which found that jogging caused breasts to bounce enough to sretch the Cooper's ligaments inside the breast. Naturally, stretched ligaments would cause the breast to sag more.
The lesson to take home from this study is that if you engage in jogging or some other type of very active sport, sports bras are recommendable.