You eat oat bran in every phase or stage of the Dukan Diet and increase the amount of oat bran that you eat as you progress through the stages, but the amount of oat bran you can eat in each phase is restricted. Although oat bran does have a beneficial impact you can have too much of a good thing and exceeding the prescribed limits of oat bran, in any phase of the diet, can stop you losing weight or even see your weight start to creep up again.
It is important to remember that the Dukan Diet is a high protein, low fat, low carb eating plan and oat bran is a carbohydrate.
In the Attack Phase or Phase 1 you can eat 1.5 tablespoons every day and this increases by 0.5 tablespoon as you progress through the other Phases. Cruise Phase or Phase 2 is 2 tablespoons, Consolidation Phase or Phase 3 is 2.5 tablespoons and Stabilisation Phase or Phase 4 is 3 tablespoons.