A Secret Between Friends: A Moment of Truth Movie (1996)

When two friends, Lexi and Jennifer, try to get into shape, they start to get rid of their food by vomiting it up. Lexi's worried mother takes her to an eating-disorder treatment center, and when she recovers she tells her mom that Jennifer might still have the same problem. Lexi's mom confronts Jennifer's mom and Jennifer gets mad at Lexi. Lexi tries to reason with Jennifer at a beach party while Jennifer is drunk, and Jennifer runs away from her and is hit by a passing car. Lexi becomes depressed and the vomiting starts again.