The method of losing weight, studied and published by a French nutritionist doctor, is simple but fundamental. Only protein foods are included in the daily meals, consumed in the desired amount. Since the digestion of proteins (read proteins) is more difficult than the same digestion of fats and carbohydrates, the body expends energy obtained from the already accumulated fat. Next, vegetables appear in the diet, enriching the body with fiber and vitamins. If you're really interested, you can read about her on my personal blog.
The Ducan Diet is just another kind of ketogenic diet.
The ketogenic diet is extremely effective for losing weight and preventing certain diseases, in particular for preventing epileptic seizures.
So why is there so much negativity from professional nutritionists?
It's very simple: the ketogenic diet should be supervised by a doctor, as is the case with many artists, or carried out by people who can write books about nutrition themselves - for example, professional bodybuilders.
Diets of Ducan, Atkins and many other ketogenic diets are marketed as effective diets for ordinary people. Therefore, they are ineffective at best and lethal at worst.
To put it very briefly and as an addition to the previous answer, everything happens by reducing calories, even if a person is eating the same amount of calories as before the diet - protein spends 30% of its calories on digesting itself, while fats - 10%, carbohydrates - only 4%. For example, you ate a pound of chicken breast, there are 100 grams of protein (20 grams of protein per 100 grams of breast), which means, according to the TEF law (thermal effect of food), you have absorbed 70 grams of protein (that is, 280 kcal from protein, since 1 gram of protein = 4 kcal).
Secondly, protein reduces appetite and does not cause a sharp surge in insulin.
The Ducan Diet prescribes a high protein intake and a reduction in fat and carbohydrates in the diet. It is divided into 4 phases, recommendations for each can be read here dukan.ru here.
The very process of losing weight depends on several factors:
The feeling of satiety that comes after taking various macronutrients follows the hierarchy: proteins -> carbohydrates -> fats, where the feeling of hunger leaves most of the proteins. This process is controlled by various hormones released by the body during the digestion of food, as well as by the fact that the rise in amino acids in the blood causes a feeling of fullness in itself. The number of calories is not limited or controlled, but due to the fact that the amount of available food decreases and the feeling of hunger is further dulled, the number of calories consumed per day is reduced, which leads to weight loss in any case.
In the first few days, due to a lack of carbohydrates, the body turns on various processes to add energy, for example, it activates glycogen stores (the storage of carbohydrates in the muscles and liver), which causes a loss of water reserves from the body, which leads to a change in body weight ... In total, the body contains approximately 400 g of glucagon, which can excrete approximately 1 kg of water.
Taken together, this really leads to accelerated weight loss and effectively. Unfortunately, Ducan's diet has a lot of "buts":
Along with other acids, with increased protein intake, the amino acid cysteine enters the bloodstream, the metabolism of which requires B vitamins and folic acid, the reserves of which are usually restored with meals. Unfortunately, most of these vitamins come from fruits and vegetables, the consumption of which is reduced by the Ducan diet, which can lead to various problems, including wikipedia.org atherosclerosis. Additional problems can be high blood pressure and kidney problems.
Of course, all of this is dangerous if you follow this diet for a long time.
The British Dietetic Association has announced the nhs.uk number 1 Dukan diet for several years in a row in the top non-recommended diets.
Interested in the mechanism of action.