Eat more vegetables, less caffeine, less white sugar, less white flour.
Start walking, about 4.5KM in 45 minutes, 3-4 times a week.
To be more enthused try to make a list of all the things that you are grateful in your life. Make another list of all the things that used to make you happy when you were younger. Stay in this memory for a while, and try to find it in your own life today!
You can read more about that at:
http://bforever1.successuniversity.com/Welcome.aspx?