Change one behavior at a time. Unhealthy behaviors develop over the course of time, so replacing unhealthy behaviors with healthy ones requires time. Many people run into problems when they try to change too much too fast. To improve your success, focus on one goal or change at a time. As new healthy behaviors become a habit, try to add another goal that works toward the overall change you’re striving for.
Involve a buddy. Whether it be a friend, co-worker or family member, someone else on your journey will keep you motivated and accountable. Perhaps it can be someone who will go to the gym with you or someone who is also trying to stop smoking. Talk about what you are doing. Consider joining a support group. Having someone with whom to share your struggles and successes makes the work easier and the mission less intimidating.
Ask for support. Accepting help from those who care about you and will listen strengthens your resilience and commitment. If you feel overwhelmed or unable to meet your goals on your own, consider seeking help from a psychologist. Psychologists are uniquely trained to understand the connection between the mind and body, as well as the factors that promote behavior change. Asking for help doesn't mean a lifetime of therapy; even just a few sessions can help you examine and set attainable goals or address the emotional issues that may be getting in your way.
Making the changes that you want takes time and commitment, but you can do it. Just remember that no one is perfect. You will have occasional lapses. Be kind to yourself. When you eat a brownie or skip the gym, don’t give up. Minor missteps on the road to your goals are normal and okay. Resolve to recover and get back on track.
http://www.apa.org/helpcenter/lifestyle-changes.aspx