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A four-phase, high-protein, low-carbohydrate weight loss plan
The Dukan diet is a high-protein, low-carbohydrate weight loss plan created by the French doctor Pierre Dukan. It became internationally popular in the 2000s and is structured around four distinct phases that move from very strict, protein-only eating toward a more flexible long-term maintenance approach. The central idea is that prioritising lean protein increases fullness and preserves muscle while the body draws on fat stores for energy.
Unlike a simple "eat less" approach, the Dukan diet uses fixed rules and a clear sequence of stages rather than calorie counting. This structure appeals to people who prefer defined rules over tracking, but it is also one of the more restrictive popular diets — particularly in its early phases, where carbohydrates and fats are heavily limited.
It is important to note that the Dukan diet has been widely criticised by nutrition and medical bodies for being nutritionally unbalanced, low in fibre, and lacking robust long-term evidence. It should be approached with caution and is not suitable for everyone.
Lasts 2–7 days. Pure lean protein only — meat, fish, eggs, fat-free dairy — plus 1.5 tablespoons of oat bran daily. Rapid initial weight loss, much of it water. Designed to "kick-start" the diet.
Continues until you reach your goal weight. Alternates pure-protein days with protein-plus-vegetable days. Non-starchy vegetables are reintroduced. Oat bran increases to 2 tablespoons daily.
Lasts 5 days for every 0.5 kg (1 lb) lost. Gradually reintroduces fruit, wholemeal bread, cheese and starchy foods, plus two "celebration meals" per week. Designed to prevent rapid weight regain.
Lifelong maintenance. Eat normally but follow three rules: one pure-protein day each week, 3 tablespoons of oat bran daily, and take the stairs / stay active. Intended as a permanent lifestyle.
Note: portion guidance is not detailed here because the diet should be undertaken with proper guidance. This is an illustrative example, not a prescription.
The Dukan diet may appeal to people who prefer strict, defined rules over calorie counting, those who enjoy high-protein foods, and people looking for a short-term structured "reset" rather than a long-term lifestyle. The rapid early weight loss can feel motivating.
It is poorly suited to vegetarians and vegans (the protein focus is heavily animal-based), people with kidney or liver concerns, anyone who struggles with restrictive eating, and those who want a balanced, sustainable approach backed by strong evidence. The Mediterranean and DASH diets have far more research support for long-term health.
Attack (pure protein for a few days), Cruise (alternate protein-only and protein-plus-vegetable days until goal weight), Consolidation (gradually reintroducing fruit, bread and cheese with two celebration meals per week), and Stabilisation (lifelong maintenance including one pure-protein day per week and 3 tablespoons of oat bran daily).
The Dukan diet is very high in protein and restrictive, especially in early phases. Health authorities have raised concerns about its low fibre, potential nutrient gaps, possible strain on the kidneys, and lack of long-term evidence. Anyone with kidney, liver or heart conditions, who is pregnant, or who has a history of disordered eating should avoid it and consult a doctor first.
Early weight loss is often rapid, partly because the Attack phase causes significant water loss. Sustainable fat loss still depends on an overall calorie deficit over time. Rapid initial loss does not always translate to long-term results, and weight regain is common once normal eating resumes.
Oat bran is the one carbohydrate allowed throughout all four phases. It provides fibre to ease the constipation a very high-protein diet can cause, and its soluble fibre adds some fullness. The recommended amount increases from 1.5 to 3 tablespoons across the phases.