Are there certain things that make getting bulimia nervosa more likely?

Bulemia: Bulemia nervosa- compulsive eating and vomiting-has many contributing factors. Bulemia, like its cousin anorexia, is often seen as a significant disturbance in body image formation. This is something that has its roots in early childhood and usually is best helped by long term therapy. For every eating disorder, the body represents something very specific to the individual who has this disorder.

At least partly: Your genetics! but also not having a realistic body image can contribute. There may also be a problem with the satiety mechanism.