When you feel stressed, engage in an activity instead of relying on food as a source of comfort. Comfort food cannot take away your stress, but it can work against you later when you feel guilty about overeating and gaining those pounds. If you go out for a walk instead, it will curb your desire to seek comfort food, and you will work off calories at the same time.
Something that's a very important part of maintaining a healthy body is maintaining a healthy body image. Allow yourself to cheat occasionally on your diet without beating yourself up about it. Rewarding yourself for good behavior on a diet is good for self esteem and cravings. If you view it as a reward and not a downfall, your mental and physical health will flourish and the overall effectiveness of your diet will be improved.