[AbiDrew85]

I think this makes a lot of sense considering how it's typical that the body's muscles and such will deteriorate from a lack of use. For example, astronauts who live in space for extended periods of time lose bone strength and such because their bodies aren't working against Earth's gravity anymore. I think there's a saying if bras really keep breasts firm, older women who have been wearing bras for most of their life would have firm and not sagging breasts.

The problem with that reasoning is that our breasts aren't held up by muscles, but by ligaments...

As for the latter... Well... Naysayers mostly think it doesn't make a difference really for sagging to wear one or not wear one... At least, permanently. While wearing the bra it has the cosmetic benefit of disguising sag, temporarily, regardless of how much your breasts sag without.

Which since it's ligaments that support the breasts, not muscles, this actually makes the MOST sense... Those ligaments are going to stretch with age basically no matter what we do... especially if you have a sudden inflation and then deflation that's common with milk production post-pregnancy...

The only thing that MIGHT help, but ONLY with preventing, is taking collagen during nursing might strengthen the ligaments enough to prevent the milk producing breasts from causing sag afterwards. Maybe. But once the damage is done, your only choice is to somehow develop enough volume for how much stretch your ligaments have had... Which a lot of the women here try to do.