Ligaments in your breasts, called Cooper's ligaments, lift and support your breasts. Over time, these ligaments can stretch out and cause the breasts to sag. Loose skin or the loss of skin's elasticity can also lead to droopy, deflated boobs.
There isn't any research that says a bra can prevent sagging. However, many women believe that wearing a comfortable, supportive bra can help to hold up the breasts and possibly keep the ligaments from stretching out especially if you exercise or if you have large breasts.
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