The South Beach Diet™ is not a traditional low-carb plan. Instead, you'll be encouraged to choose the right carbs, such as whole grains and certain fruits and vegetables; the right fats, such as olive and canola oil; and lean sources of protein. "The real secret to The South Beach Diet™ is that it's not just a diet, it's a way to eat for life." — Dr. Agatston.
Phase 1
Following Phase 1 for two weeks kick-starts your weight loss. You'll eat normal-size portions of lean meat, fish, eggs, reduced-fat cheese, nonfat yogurt, nuts, and plenty of vegetables. Snacks and desserts are part of the plan, as well.
Phase 2
Next, you'll move on to Phase 2, where you'll learn to reintroduce the right carbs, such as whole grains and most fruits. Some indulgences are allowed. You should continue to lose weight on Phase 2 until you reach your goal.
Phase 3
Once you've reached your goal weight, you'll move to Phase 3 (the maintenance phase), where you'll continue to make good eating choices. The plan will feel less like a diet and more like a lifestyle.
Referense : http://www.southbeachdiet.com