Will loosing 15 lbs after my tummy tuck affect my results? Will my skin now be loose?

Thank you for the question.

Generally speaking, best to achieve your long-term stable weight ( and maintain it afterwards) prior to proceeding with tummy tuck surgery. Having said that, it is unlikely that a 15 pound weight loss will negatively impact the end results of the procedure.

Best wishes.

Losing a small amount of weight like 15 pounds after a tummy tuck will only improve your results.  Problems with more loose skin will not occur unless you lose a lot of weight (50 pounds or more).