Increase fruits, vegetables, fiber and water. Decrease high calorie foods with no low nutritional value. Cookies and chips are fine in moderation, but you can't eat them all day long. Don't forget to get off the coach. Join an adult sports league, take an exercise class, take the dog for a walk, and chase your kids or your partner around, just move.
Exercise can also decrease depression and relieve stress.
Remember I said stress could add weight. Some times you can reduce your weight just by reducing your stress. One more thing make sure you get enough sleep, everything seems better after a good nights sleep. Used under License.