Will Weight Loss After Breast Implants Affect Cup Size?

Weght loss and the effect on breast size after implantation all depend on the fat content of the breast, the percentage of breast tissue relative to the implant as well as your own genetic tendencies for regional weight loss. IF you were an A cup before, it is not likely that you will sustain any substantial amount of breast tissue involution. However, I, anectdotally have one pateint that visbly devlops (uncovers) breast rippling when she loses 5 pounds (she is 5'7" and 125lbs)

Thank you for the question. Although weight loss will not have a direct effect on your breast implants,  significant weight loss may affect the appearance of your breasts in general. It is difficult to predict how a specific young lady's breasts will change with weight loss; how the breasts were affected historically with weight loss may be  the best indication how you will do.
Generally speaking, significant weight loss can lead to some change in breast tissue (and/or nipple/areola) position;  this “sagging” is called breast ptosis medically.
Sometimes, patients who lose weight will have a smaller amount of breast/soft tissue coverage overlying the breast implants; this change in breast anatomy may lead to a greater degree of breast implant palpability and/or rippling.  In these cases, the breasts may also appear smaller.
Therefore, generally speaking, it is in patient's best interest to achieve a long-term stable weight prior to undergoing elective breast surgery.
I hope this, and the attached link, help.

If your breasts were at all fatty, then it is possible that as you lose weight, your breast will shrink a bit.