#1: SAVE MONEY: Don't throw out the leftovers - wasting food makes you feel guilty for good reason, a lot of people are hurting financially. Join the 'clean your plate' club, but use SMALLER PLATES. Whatever holiday foods you have left, simply eat them in portion-controlled amounts until they're gone! This saves you MONEY on your next trip to the grocery store.
#2: SAVE TIME: Train with weights using big bodypart movements - don't do arm curls, triceps kickbacks, etc.. they are a waste of time. Instead, perform 'big bodypart' movements like push ups, squats, and chin ups. They burn more calories and you won't have to spend as much time in the gym to get a fat burning workout.
#3: SAVE FACE: Don't tell anyone about your weight loss efforts. By eating what you have leftover from the holidays and spending less time in the gym, you will be flying 'under the radar' and will lose weight without having to give explanations to your friends and family.