Dukan Diet Phases | Attack, Cruise, Consolidation and Stabilization

The Four Phases of the Dukan Diet, Explained

The Dukan Diet moves in four phases: Attack, Cruise, Consolidation, Stabilization. The first two do the weight loss. The last two keep it off, at least in theory. What you can eat and how long you stay in a phase depend on how much you want to lose and how quickly your body responds.

Below is a phase-by-phase breakdown of the rules, the food lists, the timelines, and where the science backs Dr. Dukan and where it doesn’t.

What’s on This Page

• Quick background on Dr. Dukan
• The four phases at a glance
• Phase 1: Attack
• Phase 2: Cruise
• Phase 3: Consolidation
• Phase 4: Stabilization
• What the evidence says
• FAQ

Quick Background

Dr. Pierre Dukan is a French general practitioner who spent decades treating patients with obesity. He published the first version of his diet in 2000 as Je ne sais pas maigrir and revised it for English readers in 2011 as The Dukan Diet: 2 Steps to Lose Weight and 2 Steps to Keep It Off Forever. The book has sold roughly 10 million copies worldwide.

Followers are allowed to add spices, herbs, artificial sweeteners, diet soft drinks, tea, coffee, and non-fat dairy at every phase so meals don’t taste punishing. Water intake matters more than most people realize because the diet produces significant ketones that need to flush through the kidneys.

The Four Phases at a Glance

Phase 1: The Attack Phase

Attack lasts 2 to 7 days and is the strictest part of the plan. You eat pure lean protein plus 1.5 tablespoons of oat bran per day. No fruit, no vegetables, no added fats beyond what’s naturally in your protein.

Dr. Dukan lists 68 permitted protein foods, including:

• Beef (roasts or grilled, avoiding fatty cuts like ribs)
• Veal (cutlets, roasts, or well-trimmed chops)
• Buffalo and venison
• Chicken and turkey (skinless)
• Other lean poultry
• Eggs
• Fish and shellfish
• Non-fat dairy (yogurt, cottage cheese, milk)
• Tofu (for the vegetarian-friendly version)

Duration depends on your goal:

• Less than 10 lb to lose: 1 to 2 days
• 15 to 30 lb to lose: 3 to 5 days
• More than 40 lb to lose: up to 7 days (with medical clearance)

Because carbs are so low, your body enters ketosis and starts burning fat and protein for fuel. That produces ketone bodies as a byproduct. Drinking plenty of water helps flush them and reduces the risk of headaches and constipation. Staying in Attack longer than recommended increases kidney load and is not advisable without medical supervision.

A short daily walk (about 20 minutes) is encouraged from day one.

Phase 2: The Cruise Phase

Cruise adds vegetables back on alternating days. So you have a “PP” day (pure protein) followed by a “PV” day (protein plus vegetables), repeated until you reach your goal weight.

Starchy vegetables are still out: no potatoes, corn, peas, beans, lentils, or avocado. What is allowed includes:

• Broccoli, cauliflower, cabbage, Brussels sprouts
• Leafy greens (spinach, kale, lettuce, chard)
• Cucumber, celery, asparagus, artichoke
• Bell peppers, tomatoes, mushrooms, onions, leeks
• Green beans, eggplant, spaghetti squash
• Small amounts of carrots and beets

Oat bran goes up to 2 tablespoons a day. Average loss is roughly 1 pound every 3 days once you’re past the Attack water drop. Exercise increases to 30 minutes a day.

The vegetables reintroduce fiber, water-soluble vitamins, potassium, and magnesium. That matters because Attack was low in all of them.

Phase 3: The Consolidation Phase

Consolidation is the transition out of active loss and the phase where most people either lock in their result or start regaining. You stay in Consolidation for 5 days per pound lost (so 40 pounds lost means 200 days here).

Foods added back:

• One serving of fruit per day (except bananas, grapes, figs, cherries)
• Two slices of whole-grain bread per day
• 1.5 oz of hard cheese per day
• One or two servings per week of starch (pasta, rice, lentils, quinoa)
• Lamb, roast pork, cured ham
• Two “celebration meals” per week where you eat anything you want

One day a week (Dukan recommends Thursday) is a “pure protein” day, like the Attack phase, to reset. Oat bran is now 2 to 2.5 tablespoons daily. Physical activity stays at about 25 minutes of brisk walking a day.

Phase 4: The Stabilization Phase

Stabilization is the “forever” phase. Dukan boils long-term maintenance down to three rules:

1. Eat 3 tablespoons of oat bran every day
2. Take the stairs whenever possible
3. Keep one pure-protein day per week (Thursday by default)

Six days a week you eat what you want. One day a week you stick to lean protein and oat bran to keep the metabolic rhythm going and to catch any small regain before it snowballs.

The ANSES report is skeptical about this maintenance model. It works only if you actually keep the weekly protein day for the rest of your life, and adherence data suggests most people don’t.

What the Evidence Actually Says

There are no large long-term randomized controlled trials of the Dukan Diet specifically. Most of what we know comes from research on similar low-carb, high-protein diets.

The 2013 meta-analysis by Bueno and colleagues in the British Journal of Nutrition combined 13 randomized trials of very-low-carbohydrate ketogenic diets versus low-fat diets. At 12 months, the ketogenic groups lost about 2 pounds more on average and improved triglycerides and HDL cholesterol. LDL rose slightly. Modest edge for low-carb; not a miracle.

ANSES’s 2010 evaluation of the Dukan Diet was blunter. Reviewers flagged:

• Low fiber, potassium, magnesium, and vitamin C during Attack and PP days
• Likely loss of muscle mass alongside fat during rapid loss
• High risk of weight regain after stopping
• Psychological effects, including food obsession and disordered eating patterns

Old wisdom holds: what you eat over years determines your health more than what you eat over four weeks. Any diet you can’t sustain probably won’t stick.

FAQ

Why does weight drop so fast in the first week?

Most of it isn’t fat. Each gram of stored glycogen holds roughly 3 grams of water. When you cut carbs hard, glycogen depletes and water leaves with it. That’s why the scale moves quickly in the first 5 to 7 days and slows dramatically after.

Can I stay in the Attack phase longer to lose faster?

Dr. Dukan caps Attack at 7 days for a reason. Longer very-low-carb, low-fat, low-fiber phases raise kidney load, worsen constipation, and increase muscle loss. Don’t extend it without medical supervision.

What happens if I cheat during Cruise?

Reintroducing carbs restores glycogen and water, so the scale usually jumps 1 to 3 pounds even if you didn’t add fat. That’s water, not fat. Get back to your Cruise pattern and it comes off again.

Why are starchy vegetables banned in Cruise?

Potatoes, corn, peas, beans, and lentils all deliver a meaningful carb load. Dr. Dukan wants Cruise carbs low enough to keep the body in a mild ketogenic state so appetite and losses stay predictable.

Do I really have to do a “pure protein” day every week for life?

That’s Dr. Dukan’s rule. It’s meant to reset any small weekly gain. In practice, adherence over years is low. If you skip it, expect regain.

Is exercise required?

It’s part of the protocol at every phase, starting around 20 minutes of daily walking and increasing to 30 minutes during Cruise. Strength training is also worth adding to protect muscle during rapid loss.

Is the plan safe overall?

Short term, for a healthy adult with no relevant medical conditions and medical clearance, the Attack and Cruise phases are usually tolerable. Long term, ANSES rated Dukan among the highest-risk plans for nutritional imbalance and rebound. If you have any medical history, get personalized advice before starting.

Related Reading

• Dukan Diet 101 for Beginners
• Stabilization Phase Complete Food List
• Dukan Diet Vegetables (Cruise List)
• Dukan Diet Oat Bran Rules
• Atkins vs Dukan Comparison