Wrestling, in school, at least has a weight certification process.
So, theoretically speaking, unless you're somehow cheating the cert system (like finding a way to add a little water to your urine sample when someone isn't looking), your minimum weight shouldn't be unhealthy for you to make - assuming you're cutting weight like a professional, following the weight drop specifications for each week (in accordance with your given cert after testing), and not washing down Chinese take out with purple drink the week of your tournament.
MMA doesn't have any such system in place. So you got dudes cutting damn near 30 lbs in many cases - which is fuckin ridiculously pussy.