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Dukan Diet 2: Nutritional Staircase A balanced, gentle and gradual method. Since the phenomenal success of his method in the early 2000s, Pierre Dukan has travelled the world studying and gather further information; As has been the case throughout his career, these encounters have led him to enhance his method. A balanced week with constant weight loss The nutritional staircase is a set of 7 steps which reflect the importance in terms of weight loss categories of foods as they are introduced on each successive day.