Will a weight loss of 20 pounds lead to saggy breasts?

Thank you for sharing your excellent question.  Though nothing replaces an in-person examination, or full series of photographs, based on your age and current weight a 20lb weight loss is unlikely to lead to saggy breasts as your skin should retract well.  If you have breasts with extensive stretch marks or ones comprised largely of fatty tissue then you may experience some sagging.  Hope this helps.

Thank you for your question. A 20lb weight loss for you is substantial. At your age, your breasts are primarily glandular tissue, meaning that the size of your breasts are not as likely to change substantially with weight loss. As we age, the glandular breast tissue become more fatty and with weight gain and loss the size of the breast can fluctuate more substantially. Of course, any weight loss can leave you with loose skin. But, a woman's breasts are not fully developed until they have been pregnant and breast fed. Good luck with your weight loss goal! 

This is very difficult to answer without photographs. Furthermore, you will only no the answer to that if you lose 20 pounds.

Christie.   In some people, significant weight loss can cause breasts to sag, but doubtful at your age with a 20 lb. weight loss. The real question is do you really need to lose that much weight? Height plays a factor. Talk to your family doctor about your desire to lose 20 lbs. Good luck!

Breast sagging can depend on many factors such as age, genetics, overall body fat in relation to breast tissue, and prior pregnancy. Our guess would be that at your current age your breast is mostly dense tissue with relatively little fat, especially as your current weight is just 128, a low BMI or body fat content. To get to 108 you will need hard training and a high protein diet to push your weight down and stay "fit". Our bet is your breast will not sag, but do let us know.