Dear Taja, Yes, a tummy tuck can make your waistline smaller, but a lot depends on your anatomy. The largest change occurs from the muscle tightening - but this is limited by your intra-abdominal contents (ie: the guts / internal fat). If the inside is full, you cannot tighten / squeeze it too much. On the other hand, if the abdominal wall is lax and you are empty inside, your surgeon can tighten the abdominal wall significantly, which will flatten your abdomen on side view, and can also pull in your flanks (area above the hips). This secondary component depends on your bone structure. If your ribcage is far from your hips, you will notice a significant change in the flanks -- if it is very close (a few inches), not much of a change will occur here. Lastly, if you have fat deposits along your flanks, you can add liposuction to the tummy tuck for a fairly drastic change. This works great in appropriate candidates, as the increased skin tension from the tuck enhances the result from the lipo. Please view my informational video on my website. It is animated with before and after morphs and points out most of the changes you can achieve from a tummy tuck. Best wishes! Dr.B