Summary:
Once dieters have lost all the weight they want to, they proceed to Phase Three, where the variety of foods is liberalized still further and weight is maintained. The change from Phase Two is not very great, however.
What You Eat:
In the original book, Agatston says that the knowledge gained in the first two phases will guide eating and that there is no food list for Phase Three. However, the Good Fats Good Carbs Guide has lists of food with codes as to how often they are allowed in each phase. Essentially, the recommendations tend to be that a few foods (with either more carbs or saturated fat) can be eaten somewhat more often, but otherwise its very similar to Phase Two.
Length of Phase:
Forever. However, it is also expected that people will switch back and forth between phases as needed.
Menus:
Menus are mostly going to consist of protein, vegetables, and fruit, with small portions of whole grains and sources of mono and polyunsaturated fats (e.g. avocado, nuts, olives and olive oil).

