21. 5:2 diet

20. Acid-Alkaline diet

19. Atkins diet

18. Autoimmune Protocol diet

17. Cambridge Weight Plan diet

16. Dukan diet

15. Fodmap diet

14. Ketogenic diet

13. Lighterlife diet

12. Paleo diet

11. Rosemary Conley diet

10. Slimfast diet

9. Slimming World diet

8. South Beach diet

7. Specific Carbohydrate diet

6. The Whole 30 Program diet

5. Vegetarian diet

4. Weight Watchers diet

3. Weston a Price diet

2. Vegan diet

1. Mediterranean diet