Honestly, I don't get the obsession over the physical appearance of TSOs. Yes, members of the military are, universally, in much better physical shape. But that's directly related to their job function --- as pointed out upthread, the military's chief job is to kill people and break stuff, and you need to be fit to do that.

What does a TSO's weight have to do with their job function? Running an X-ray or an AIT machine, manning a TDC station or serving as an exit guard, performing patdowns ... none of these functions require an Adonis-like physique.

If the problem is presenting a professional appearance, there are other ways for TSA to achieve that, even with a few extra pounds.