Isn't a fetish having a sexual fascination and strong desire for something beyond the basics? For example, I am a masochist. Since pain is a turn on for me, and it isn't "normal", it's considered a fetish. On a larger scale, the deep sexualization of breasts is frequently considered a western fetish because it's a fixation on a part of the body.    So, with those examples, wouldn't an explicit attraction to fat be a fetish? I would say so. You find fat sexual. That isn't " normal", and it's a fixation on a part of the body (one that shouldn't be so present, but still).