UFC 168 -- Winners Celebrate ... WITH JUNK FOOD

Hours after retaining his championship belt and possibly ending Anderson Silva's career ... UFC Middleweight champ Chris Weidman continued his campaign of destruction -- by decimating a double bacon cheeseburger.

Weidman partied at Surrender nightclub -- washing down his burger with a cold Miller Lite.

UFC's other big winner Ronda Rousey also feasted in celebration ... she went with family and friends to Wolfgang Puck's restaurant at the MGM for her usual post fight chicken wings.

America!