In fact, most people in cases of rape, tend to overcompensate in their lives in one way or the other. Rape victim typically tend to either become very promiscuous sexually or obese, or both in some cases.
Victims of abuse may have very healthy self-esteems, but they tend to become abusers themselves. Most chronic abusers are very, very self-assured. That's what makes them so attractive to their victims. Well, that and repeat patterning events.
What tends to cause low self-esteem are overbearing or ineffective parents and bullying. The child feels helpless and, therefore, makes himself that way over the course of his life. Basically, in the simplest of terms, it's also repeat patterning and it is a conditioned response.
Whether you like psychology or not, our mental and emotional habits are formed our of our experiences and patterns.
Also, as far as sciences being faddish, I'd like to point the finger at supposed weight loss plans before I start pointing my fingers at applied sciences.