Does liposuction damage collagen and make you more likely to experience premature aging in lipo'd areas?

Your question is actually very important. Any type of liposuction will cause some ancillary damage to collagen. Over the years it appears is that conventional liposuction doesn't generate long-term unwanted outcome. Liposuction assisted by a laser or ultrasound is something else. In my opinion the thermal damage down to the connective tissue makes use of these techniques unwarranted.

There is no evidence liposuction causes collage damage or premature aging. I don't think any dietary changes are needed following liposuction.