Breasts sag because they have a poorly supported weight attached to the chest wall by small ligaments called Cooper's ligaments. As we age and with added weight pulling on them these ligaments give and stretch and the breasts begin sagging inferiorly very much like a sail which lost its filling wind. Consider the difference between a balloon and a wind filled sail. A wind filled sail may point more forward but will not rise up. Hoping that a forward facing structure like a breast or sail would rise by the addition of volume (wind or an implant) is unrealistic. A breast implant fills the breasts and takes out the sag BUT it cannot lift it. Similarly, the breast fold and the lower chest skin under it (which may have a fat pad in some women) is densely attached to the chest wall. ( you can pull on the skin under the breast and the nipple would not move). This flesh will not move or in medical speak, be recruited, by forward pushing of the breast skin by implants. In sumnary, breast implant fill the breast but do not and cannot lift it permanently. Adding more weight to the breasts will perk it up a bit but will not lift them . And eventually when gravity wins, sagging will occur. Advice? Pick the smallest implant you would be happy with. Have a breast lift if once is indicated. Wear an appropriate bra whenever you can. Peter Aldea MDMemphis, TN