Lost about 35 pounds, got better fitting clothes.
Started noticing random women treating me differently*; friendlier, chattier, stealing glances at my crotch (which looks bigger without the belly). I don't know if I feel more confident because of this, or if it's happening because I appear more confident. Either way, this attention is a lot of fun for me.
* (they aren't being creeps, like many men do to women in similar situations)