Will losing a 10-15 pounds after a breast lift affect results ?

It would depend upon your skin tone but weight loss or yo yo weight changes can affect the surgical outcome. In an ideal world, stable weight is what we all strive for. If you are planning to lose the weight and maintain the lower weight, then doing so prior to surgery would be preferable.

It depends on your skin tone and your body’s natural
distribution of fat. If you tend to put on weight in your breasts, then you run
a higher risk of sagging after you lose it. Ideally, breast lift candidates
should maintain a stable weight after the procedure, but if you’ve already had
a breast lift and you’re looking into health and fitness, then your best option
would just be to take weight loss at a steady and slow pace in order to keep an
eye on how your breasts and body respond to the gradual decrease of weight over
time.

Yes, losing weight after your lift, especially that amount of weight, will affect your breasts -- probably causing them to sag a bit. Which is why it is always best to reach a maintainable weight before considering any type of cosmetic surgery. Best, Dr. Nazarian