The Dukan Diet: phases, menus, recipes, principles, effects

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What is the Dukan protein diet?

The Dukan diet is an eating plan developed by French physician Pierre Dukan, who began working on it in the 1970s, taking inspiration from the story of one of his patients who, in order to reduce his weight, expressed a desire to give up most foods, excluding meat [1,2].

What is the Dukan diet all about?

The Dukan Diet is a high-protein regimen focused on increasing protein intake while restricting carbohydrates and fats. The Dukan diet is a diet consisting of 4 phases, also known as stages, during which the allowed foods are changed. It does not impose calorie limits but encourages regular physical activity, even if just walking.

Why is the Dukan diet considered unhealthy?

Although it has gained popularity due to its rapid weight-loss effects, prolonged use of the Dukan diet has adverse effects on health due to excessive amounts of protein which can stress the kidneys, nutrient deficiencies due to its initial phase, and digestive problems due to a lack of fibre.

What are the different phases of the Dukan diet?

The diet progresses through phases, each marked by specific food allowances that outline what can be eaten during each stage of the Dukan Diet. These include:

• Phase 1 – shock phase
• Phase 2 – alternation phase
• Phase 3 – consolidation phase
• Phase 4 – stabilisation phase

Dukan Diet – phase 1

The first phase of the Dukan diet, known as the shock phase, focuses on intensive weight loss by eating only animal protein products. It lasts from 2 to 10 days, depending on your weight loss goal and the amount of weight you wish to lose.

The first phase of the Dukan diet is the most restrictive period, during which carbohydrates and fats are eliminated from the menu. In the first phase of the Dukan diet, the products allowed include mainly lean meat and high-protein, low-fat products:

• Eggs
• Veal
• Poultry
• Seafood and fish
• Offal
• Lean dairy products.

In phase 1, 9 g of oat bran should be consumed daily. The taste of food can be enriched with spices such as thyme, onion, garlic, parsley, mustard and salt. Tea and coffee sweetened with artificial sweeteners and light fizzy drinks are allowed. During the shock phase, it is important to prepare meals without the addition of fat. The maximum amount of fat allowed is 5 g per day. Cooking, stewing, roasting or grilling is recommended. It is also important to provide the body with sufficient water.

Dukan Diet – phase 2

The second phase of the Dukan diet consists of alternating 5 days of eating as in the shock phase, followed by another 5 days of the shock version with selected low carbohydrate vegetables. This is the longest phase, lasting until the target weight is reached.

Vegetables allowed in the second phase of the diet include:

• Tomatoes
• Cucumbers
• Radishes
• Courgettes
• Broccoli
• Cabbage
• Spinach
• Celery
• Asparagus
• Carrots

It is worth mentioning that there are two permitted dietary patterns during the consolidation phase. One is to eat according to the principles of phase 1 for 5 days, followed by another 5 days of a protein diet with the inclusion of products from phase 2.The second permitted approach is to follow the two dietary phases alternately, day after day.

During this stage of the diet, the consumption of starchy vegetables such as potatoes, peas, broad beans or lentils is avoided. In addition, the addition of vegetable fats, such as oils, nuts, seeds, and avocados, is prohibited to meals.

Dukan diet – phase 3

The third phase of the Dukan Diet, known as the consolidation phase, begins once the weight loss goal is reached, and introduces a wider variety of foods. The menu is enriched with products containing fats and complex carbohydrates.

All the products from the previous stages are allowed and, in addition, the diet is enriched with:

• One portion of fruit per day (except banana, cherries, grapes)
• Two slices of whole-grain bread and one slice of yellow cheese per day.
• Starchy foods (pasta, groats, potatoes, rice, legumes), allowed twice a week
• Healthy fats in limited quantities

In phase 3, remember to devote one of the days of the week to returning to the protein diet, the diet from phase 1.

Dukan diet – phase 4

The final phase of the Dukan Diet, called the stabilization phase, involves a gradual return to normal eating patterns. It is the moment when we can return to a standard diet, taking into account the principles of healthy eating. The goal of phase 4 is to solidify new eating habits, prevent weight regain, and maintain the desired physique.

Although there are no strict dietary recommendations, it is necessary to return to a high-protein diet once a week, at the same time eating 3 tablespoons of oat bran a day to prevent constipation. The fourth phase of the Dukan diet, as conceived by the author, should be continued for as long as possible.

What do sample recipes on the Dukan diet look like?

Recipes on the Dukan diet should be tailored to each phase, characterised by the specific products that can be eaten. Each recipe is based on a high protein content, while being low in fats and carbohydrates.

Phase 1: Omelette with grilled chicken and lean cottage cheese

Ingredients:

• 2 eggs
• 100 g grilled chicken
• 30 g of lean curd
• Salt and pepper to taste

Method of preparation:

1. Scramble the eggs in a bowl, season with salt and pepper.
2. Pour them into a hot, dry frying pan.
3. When the eggs start to curdle, add the sliced chicken and crumbled cottage cheese.
4. Fry until the eggs have set and the cheese has melted.

Phase 2: Baked cod with vegetables

Ingredients:

• 150 g cod fillet
• 1 clove of garlic
• 1 carrot
• 1 courgette
• 1/2 red pepper
• Juice from half a lemon
• Salt and pepper to taste

Method of preparation:

1. Slice the courgette, carrot and pepper, chop the garlic.
2. Place the cod on a baking tray, season with salt, pepper and lemon juice.
3. Arrange the vegetables on the tray so that they surround the cod.
4. Bake in an oven preheated to 180°C for approximately 20 minutes.

Phase 3: Tuna tartare

Ingredients:

• 150 g chopped raw tuna fillet
• Egg yolk
• Two slices of wholemeal bread
• 1 teaspoon olive oil
• 1 teaspoon lemon juice
• Salt and pepper to taste
• Chopped parsley for garnish

Method of preparation:

1. Season the chopped tuna with salt and pepper, then mix with the olive oil and lemon juice.
2. Shape the tartare into a ball with an indentation in which to place the egg yolk.
3. Sprinkle with chopped parsley before serving.
4. Serve with two slices of wholemeal bread.

What does a sample menu on the Dukan diet look like?

A sample menu on the Dukan diet consists of four meals, adapted to the principles of each phase of the diet. Taking into account the assumptions of each phase, the meals can be modified to suit your taste preferences.

Phase 1 (shock):

• Breakfast: Two egg omelette, chopped grilled chicken.
• Second breakfast: Skim natural yoghurt.
• Lunch: Roast turkey.
• Dinner: Canned tuna in its own sauce.

Phase 2 (alternate):

• Breakfast: Two fried eggs, slice of lean ham.
• Second breakfast: Salad with tuna, salad mix, onion, cucumber and tomato.
• Lunch: Braised chicken fillet with grilled vegetables (peppers, courgette, aubergine).
• Dinner: Baked cod with steamed vegetables.

Phase 3 (fixings):

• Breakfast: Two slices of whole-grain bread with lean cold cuts and a slice of skimmed yellow cheese.
• Second breakfast: Lean cottage cheese with strawberries and a spoonful of bran.
• Lunch: Caesar salad with chicken, no dressing.
• Dinner: Grilled steak with steamed vegetables.

Phase 4 (stabilisation):

• Breakfast: Two egg omelette with vegetables, slice of wholemeal bread.
• Second breakfast: Shake based on natural yoghurt and banana.
• Lunch: Herb-roasted cod with spinach and roasted tomatoes.
• Dinner: Salad with grilled chicken and mixed vegetables with a dressing based on olive oil and lemon juice.

What are the results of the Dukan diet?

The Dukan protein diet is known for its rapid weight loss, making it a popular choice among those wishing to achieve their figure goal quickly. Already in the first phase, you can expect to lose around 2-3 kilograms. However, it is worth bearing in mind that this is mainly water loss and not permanent weight loss effects. While the results may initially be promising, they are often hard to sustain. The restrictive menu can lead individuals to revert to previous eating habits, contributing to a cycle of weight regain, known as the yo-yo effect. It is important to remember that healthy weight loss is not only about rapid weight loss, but also about maintaining a balance of different nutrients. Following the Dukan diet for a long time can lead to deficiencies and strain on the body’s organs and systems.

Is the Dukan diet healthy?

The Dukan diet is not healthy – long-term use of a high-protein diet leads to dangerous side effects. There is a reason why the Dukan diet has been ranked as one of the worst diets. In the 2022 Diet Ranking, it ranked 39 out of a possible 40 [3].

The Dukan Diet’s principles limit fiber intake, which can lead to constipation issues. In addition, high protein intake increases putrefactive processes in the intestines and the production of toxic compounds such as putrescine and cadaverine, which can increase the risk of developing diseases such as colorectal cancer. In addition, restrictive phasing of products is associated with nutritional deficiencies, including calcium, magnesium, selenium, manganese and B, A, C and E vitamins. An imbalance in nutrient intake can lead to health problems such as osteoporosis and cardiovascular disease. These types of diets are not recommended by scientific societies – there is no research to confirm that they are more effective and safer than diets that restrict calorie supply. In addition, the division of food into allowed and not allowed products has a negative impact on a healthy and appropriate relationship with food [4]. Rather than risking the negative effects on the body from the Dukan diet, a better approach may be to choose a balanced diet that provides the body with adequate amounts of all essential nutrients.

What are the side effects of the Dukan diet?

The side effects of the Dukan Diet primarily stem from reduced fiber and deficiencies in vitamins, minerals, and other essential nutrients. Long-term adherence to the diet is associated with a number of negative health effects, ranging from deterioration of wellbeing to the risk of serious diseases.

Among the side effects of the Dukan diet we can distinguish:

• Constipation problems due to insufficient dietary fibre.
• Deficiencies of vitamins and minerals, leading to ailments such as osteoporosis, associated with calcium deficiency, and strain on the liver and kidneys, especially in people with pre-existing organ conditions
• Concentration disorders, dizziness and headaches
• irritability and loss of energy
• Muscle and joint pains
• Eating disorders, resulting from dietary restrictions
• Deterioration of skin, hair and nails
• Risk of a yo-yo effect when the diet ends
• Decrease in physical performance and worsening of post-workout recovery in physically active people

What are the advantages of the Dukan diet?

The advantages of following the diet include, above all, a high protein supply, which contributes to the effective building of muscle mass and a long-lasting feeling of satiety, as well as recommendations for regular physical activity. It is worth knowing that the dietary model does not require control over the amount of calories consumed.

After completing the first phase of the Dukan diet, it is advisable to introduce physical activity adapted to individual preferences. According to WHO recommendations, adults should do at least 150 minutes of moderate-intensity aerobic activity or at least 75 minutes of high-intensity aerobic activity per week. This is undoubtedly one of the biggest benefits of the Dukan diet. Just 1.5 hours of physical activity per week can reduce the risk of mortality by 20% [7].

Building muscle mass

The Dukan Diet’s high-protein intake is particularly beneficial for physically active individuals. An adequate supply of the macronutrient provides the conditions for the development of muscle mass and effective regeneration after training, which contributes to improved physical performance and better sports results. Nevertheless, it is worth remembering that due to the restrictions associated with the Dukan diet, the body experiences a decrease in energy and strength. Consequently, the possibilities of realising the potential of a high-protein diet may be limited.

The feeling of satiety

Eating protein-rich meals leads to a prolonged feeling of satiety. Protein digests more slowly than carbohydrates, so the body feels satisfied for longer and does not feel the need to eat frequently. As a result, people following a protein diet can avoid snacking between meals [5,6].

No need to count calories

Those following the Dukan Diet do not need to track calorie intake, which can simplify the process of achieving weight-loss goals for many individuals. Attention is focused on choosing the right foods and controlling the amount of protein consumed.

Physical activity

After completing the first phase of the Dukan diet, it is advisable to introduce physical activity adapted to individual preferences. According to WHO recommendations, adults should do at least 150 minutes of moderate-intensity aerobic activity or at least 75 minutes of high-intensity aerobic activity per week. This is undoubtedly one of the biggest benefits of the Dukan diet. Just 1.5 hours of physical activity per week can reduce the risk of mortality by 20% [7].

Dukan diet or keto diet – which one to choose for weight reduction?

In order to achieve your chosen figure goal, the ketogenic diet would be the right choice, ensuring not only effective but also healthy and safe weight loss. Although both dietary models are popular methods for weight loss, they differ in many respects.

In terms of the nutritional value of the meals, the diets have in common the restriction of carbohydrates. In contrast to the macronutrient breakdown of the Dukan diet, which assumes a high protein intake and elimination of fats, the keto diet is based on high fats and moderate protein. Its aim is to bring the body into a state of ketosis, during which the body burns fat as its main source of energy. Although the body can produce ketones during phase 1 of the Dukan diet, they are produced in such small amounts that they are not enough to enter a state of ketosis. The fat loss process on the ketogenic diet is therefore more efficient.

Keto versus the Dukan diet in terms of flexibility

Compared to the Dukan Diet, the ketogenic diet provides greater flexibility and food variety.
By design, it does not eliminate any specific foods – what is important is to control the amount of carbohydrates delivered to the body. In this way, keto is more nutritionally balanced, as it allows for the consumption of more healthy fats, providing the body with essential fatty acids and minerals, and fibre, which plays an important role in regulating digestion, maintaining a healthy bacterial biota in the gut and stabilising blood glucose levels.

The ketogenic diet is linked to multiple health benefits. Unlike the health risks associated with long-term adherence to the Dukan Diet, the keto diet may support heart health by lowering triglycerides and LDL cholesterol while raising HDL cholesterol, potentially reducing the risk of cardiovascular disease. Additionally, it can provide effective support in improving metabolic health by reducing blood glucose levels and improving insulin sensitivity, which is particularly important for people with type 2 diabetes. In addition to weight loss like the Dukan diet, the keto diet has health benefits that support the maintenance of better long-term health.

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