This is true among this age range
Answer: because people have a poor perception of their image.
Explanation:
People who develop an eating disorder such as anorexia and bulimia are people who have low self-esteem. They look in a mirror and do not like what they see of themselves, so they resort to extreme eating behaviors to achieve what they call "ideal weight."
Well.. Usually no...
Unless they didn't sterilize or clean the tools used for the surgery.
Which would be quite the rare occasion...
good luck!