{"id":275,"date":"2025-11-15T10:45:22","date_gmt":"2025-11-15T10:45:22","guid":{"rendered":"https:\/\/metaboliboost.com\/articles\/?p=275"},"modified":"2026-09-20T09:13:14","modified_gmt":"2026-09-20T09:13:14","slug":"dukan-diet-should-i-try-it","status":"publish","type":"post","link":"https:\/\/metaboliboost.com\/articles\/dukan-diet-should-i-try-it\/","title":{"rendered":"The Dukan Diet: Should You Try It?"},"content":{"rendered":"\n

Probably not as a first choice. The Dukan Diet works by removing almost every carbohydrate, and the weight that vanishes in the first week is mostly water. Trials comparing low carbohydrate eating with balanced carbohydrate eating find little difference after a year. What decides the outcome is whether you can keep the pattern going.<\/strong><\/p>\n\n\n\n

What is the Dukan Diet actually asking you to do?<\/h2>\n\n\n\n

The Dukan Diet is a four phase programme built by the French physician Pierre Dukan around a single idea: eat protein and very little else until the weight comes off, then add food groups back on a fixed schedule. It is not a calorie counting plan and it never asks you to weigh a portion. It is a list plan. You eat what is on the list and ignore everything else.<\/p>\n\n\n\n

The four phases run in order, and each has a job.<\/p>\n\n\n\n

Phase<\/th>What the rules allow<\/th>How long it runs<\/th>What it is meant to do<\/th><\/tr><\/thead>
Attack<\/td>Lean protein only: chicken, white fish, prawns, eggs, low fat dairy, tofu<\/td>A few days<\/td>Produce a fast early move on the scale<\/td><\/tr>
Cruise<\/td>Pure protein days alternating with protein plus permitted vegetables<\/td>Until the target is reached<\/td>Keep losing while some fibre returns<\/td><\/tr>
Consolidation<\/td>Fruit, bread, cheese and starch reintroduced on a set schedule<\/td>Scaled to how much came off<\/td>Slow the rebound that follows a strict phase<\/td><\/tr>
Stabilisation<\/td>Ordinary eating plus one pure protein day a week, oat bran daily, a daily walk<\/td>Indefinitely<\/td>Hold the result<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\"Sliced
Lean protein is all the Attack phase permits.<\/figcaption><\/figure>\n\n\n\n

Two features of that structure deserve attention. The first is that phase four has no end date: the programme is written to be followed for life, and the rules of the final phase are the ones most people quietly stop keeping. The second is that the plan carries a fibre supplement from the beginning, because the permitted food list does not supply enough on its own. When a way of eating has to be patched to be adequate, the patch is telling you something.<\/p>\n\n\n\n

Why does the scale move so fast in the first week?<\/h2>\n\n\n\n

Mostly because of water. Carbohydrate is stored in muscle and liver as glycogen, and glycogen is stored wet: each gram of it is held alongside roughly three grams of water. Strip carbohydrate out of the diet and the body works through that store, and the water leaves with it. Low carbohydrate eating also increases sodium excretion, which takes more fluid with it. The number on the scale falls before body fat has changed in any meaningful way.<\/p>\n\n\n\n

\"Feet
The first week’s drop is mostly water.<\/figcaption><\/figure>\n\n\n\n

That early movement is real in the narrow sense that the number is genuinely lower. It is not what most people reading it think it is, and it reverses at the same speed when carbohydrate comes back. This is why the Consolidation phase exists, and why it is the phase people find hardest: the plan is spending weeks managing a rebound its own opening phase set up.<\/p>\n\n\n\n

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With any low carbohydrate plan, the first fortnight of scale readings is noise rather than signal. Judge the approach on month two.<\/p>\n<\/blockquote>\n\n\n\n

Does high protein really raise your metabolism?<\/h2>\n\n\n\n

It raises it, but by less than the claim implies. Digesting and processing food costs energy, an effect called diet induced thermogenesis, and protein costs more to handle than carbohydrate, which in turn costs more than fat. A review of those measurements, published in the journal Nutrition and Metabolism<\/a>, puts diet induced thermogenesis for a mixed diet at 5 to 15 percent of daily energy expenditure, with the figure sitting higher when protein makes up more of the intake and lower when fat does.<\/p>\n\n\n\n

So the direction of the claim is right and the size of it is small. Changing what your calories are made of shifts a slice of the day’s energy budget, not the budget itself. The same review points at something more useful: the thermic effect of protein is bound up with satiety. Protein is filling, and that, rather than any furnace effect, is the mechanism most likely doing the real work. It is also a mechanism you can borrow without adopting the phases. For the wider version of the same question, how much you can actually raise your resting metabolic rate, and the honest size of the effect<\/a> works through what does and does not move the budget itself.<\/p>\n\n\n\n

What does the trial evidence say about cutting carbohydrate?<\/h2>\n\n\n\n

The Dukan programme as a complete package has not been through the kind of randomised testing that would settle the question. What has been tested repeatedly is the idea underneath it. A Cochrane review of low carbohydrate versus balanced carbohydrate diets<\/a>, published on 28 January 2022 and indexed here<\/a>, pooled randomised trials in adults living with overweight and obesity, with and without type 2 diabetes.<\/p>\n\n\n\n

The finding was that there is probably little to no difference between them. Among participants without type 2 diabetes, the gap between the two approaches came to about one kilogram over three to eight months across 37 trials, and under a kilogram over one to two years across 14 trials. Among participants with type 2 diabetes the pattern was the same, and blood pressure, HbA1c and LDL cholesterol tracked together too. People in both arms lost weight. Neither arm beat the other by a margin a person would feel.<\/p>\n\n\n\n

That is the single most important thing on this page. Carbohydrate is not the variable that decides the outcome. Which foods you can still be eating in eighteen months is.<\/p>\n\n\n\n

How does Dukan compare with a balanced plan?<\/h2>\n\n\n\n
<\/th>Dukan<\/th>Balanced reduced energy eating<\/th><\/tr><\/thead>
What it restricts<\/td>Almost all carbohydrate and most fat, by food group<\/td>Portions and overall intake, not whole food groups<\/td><\/tr>
Fibre<\/td>Needs an added source from day one<\/td>Comes from the food itself<\/td><\/tr>
Early scale movement<\/td>Fast, largely water and glycogen<\/td>Slower and steadier<\/td><\/tr>
Difference at one to two years<\/td>Little to no difference between the two<\/td>Little to no difference between the two<\/td><\/tr>
Eating out<\/td>Difficult in the strict phases<\/td>Usually workable<\/td><\/tr>
Rules to remember<\/td>Four phases, two day types, a weekly protein day<\/td>One pattern, applied consistently<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Dukan is often set beside keto, and the two are not the same animal. Keto drives fat to the centre of the plate, while Dukan pushes fat down alongside carbohydrate and leaves lean protein carrying nearly the whole diet. If you are weighing the two, the differences between keto and other low carbohydrate plans<\/a> matter more than the shared label.<\/p>\n\n\n\n

Who should not start this without talking to a doctor?<\/h2>\n\n\n\n

Some circumstances turn a restrictive plan from uncomfortable into genuinely unwise, and none of them are things to work out alone from a web page. Raise it with a clinician first if any of the following apply to you.<\/p>\n\n\n\n