Stay positive! Surround yourself with positive people, positive images, positive affirmations. I remember reading a quote on here once that said something like "By making unhealthy food choices the only thing you are depriving yourself of is the healthy happy life you are meant to live". It's always so easy to say that we feel deprived if we cut out chocolate, chips, deep fried onion rings, etc, but really.....we are only depriving ourselves of the health that will carry us farther along into our golden years!
Find something you enjoy doing. I usually go with the flow. Some days I just can't stand the thought of going on the treadmill because I feel like a hampster on the wheel, but I'll make the choice to do something different. Go for a bike ride, go for a walk outside, go for a hike. Use your legs for what they were meant for!
And most of all, forgive yourself. None of us are perfect...although I tell my husband I am

If you have a bad meal, don't wait until tommorow, hop back on the wagon right then. Don't blow the whole day.