To me all of the below are in some way the same sort of thing, although I didn't see it that way until Richard pointed it out a year or so back. It made me feel a lot less bitter at people who I don't see as overweight who still want to be thinner. I instinctively still find the cosmetic surgery more distasteful than most of the rest, and wonder if others feel the same.
NB More what you find acceptable in others than what you would consider doing yourself.
Which of the following are acceptable forms of body modification (to you):