the action of eating more food than your body needs, especially so that you feel uncomfortably full

Overeating is surely the main cause of obesity. 暴饮暴食肯定是导致肥胖的主要原因。

Amongst the group, overeating is common, and no one exercises regularly. 在这个群体中，暴饮暴食很常见，而且没有人经常锻炼。