I have been looking at ways to raise my Serotonin levels and have been reading quite a good book on my kindle. Part of the book covered low fat diets and cravings. Apparently women are likely to have lower serotonin levels and it advises that people who are prone to depression or have low serotonin levels will quickly have low moods and cravings on a low fat diet as their serotonin levels will drop rapidly. A solution to this is to have a high carbohydrate,very low protein meal and snack for your first 2 meals of the day with a small amount of protein with the evening meal and a carbohydrate snack before bed. They do also recommend whole grains to keep sugar levels stable. This can be done on the SW Green plan. I have been trying this for about 3 days now and do not have the same cravings as I was having. Of course I would still choose chocolate and cake over a salad, but the cravings are at a level that I can resist them. It might be worth looking into if anyone else has been struggling with cravings. Also if you google serotonin and low fat diets you there is quite a bit of information on it.