>>58640434Genuinely curious, but why are you trying to? If it's something you're attracted to, you just kind of...are.
But if you were trying to get rid of it, I'd suggest trying to find unsightly things that can be easily associated with it. e.g. going for SSBBW or even larger, or God forbid if necessary, slob stuff so whenever you think 'fat fetish', your brain connects the dots and the boner auto-kills itself.
Of course there is a chance that it backfires, but I don't have anything else.