Have a cheat day (or item) once a week. Nothing over the top but something to treat yourself, especially if you eat healthy most of the time. Even if its just one doughnut, a couple scoops of ice cream, a small slice of cake, or even a slice of pizza. Foods are only "bad" if you eat them all the time. It's okay to treat yourself to a prize once in a while.
If you are trying to lose weight, dont weigh yourself everyday. Most of the time when you are working out you are gaining muscle as well. Its better to write down your measurements than to write down your weight. This has pissed me off lol, I hate looking at the scale and not seeing the number move when i've been busting my a** in workouts everyday. But i've realized as im dropping lbs im gaining muscle.
I'm sure most of you guys already know this. Just thought I'd share the information for those who don't.