Once again about the meaninglessness of dieting by blood groups
The blood type diet was exposed
Copper news based on the materials of the University of Toronto: Popular blood type diet debunkedNutrigenomics specialists from the University of Toronto (Canada), for the first time (for the "first time" see below – VM), having conducted a large-scale study of the validity of the popular hypothesis that nutrition in accordance with one's blood type has a positive effect on health and reduces the risk of developing chronic diseases, found out its complete inconsistency.
No connection was found between the blood type of the study participants and the effects of a particular diet on their health. The work was published on January 15 in the journal PLoS One (Wang et al., ABO Genotype, ‘Blood-Type’ Diet and Cardiometabolic Risk Factors).
The blood type diet became popular after the publication in the late 1990s of the bestseller "Eat Right for Your Type" by the American naturopath Peter D'Adamo. The book has been translated into 52 languages of the world and has sold more than seven million copies. The theory on which D'Adamo is based is as follows: the immune and digestive systems of a person retain a predisposition to the same foods that his ancestors once consumed, therefore, the chemical reaction between blood and food eaten is an integral part of the genetic heritage. Therefore, nutrition in accordance with one's blood group inherited from one's ancestors – the complete exclusion of some foods and, conversely, greater consumption of others - can improve health and reduce the risk of chronic diseases. However, no scientific testing of this hypothesis has been carried out so far.
The authors of the study under the guidance of the head of the Department of nutrigenomics (the science of the effect of nutrition on gene expression) The University of Toronto Ahmed El-Sohemy conducted a statistical analysis of data concerning 1,455 healthy heterosexual young people aged 20 to 29 years, belonging to different ethno-cultural groups. The ABO blood type was determined for all participants, as well as the starting indicators of such cardiometabolic risk factors as insulin, cholesterol, glucose triglycerides and others. Each participant received four lists of products recommended or not recommended for use for four blood groups, and he had to decide whether or not to adhere to these recommendations himself. Monthly updated data on the physical condition and nutrition of participants were collected for six years, from October 2004 to December 2010.
In order to assess to what extent following a blood group diet is associated with an improvement in cardiometabolic risk factors, participants were divided into groups of those who ate strictly in accordance with D'Adamo's recommendations, and those who followed the same diet, but did not correspond to their blood group. Then, biomarkers associated with the risk of metabolic disorders and cardiovascular diseases in each of these groups were compared.
As a result, it was found that all types of diets in general had a beneficial effect on the health of participants, normalizing indicators such as body weight, blood pressure, cholesterol, glucose, insulin, triglycerides and others. But there was no statistically significant relationship between following a blood type diet and improving performance, which does not speak in favor of the D'Adamo hypothesis.
"The way an individual reacts to any of these diets is absolutely not related to his blood type, but completely depends on the individual sensitivity of the body to a vegetarian or low–carb diet," El-Soemi noted. "The results obtained allow us to reasonably assert that the theory underlying the blood type diet is false."
From the editorial office
In fact, sensible nutritionists have never taken this hypothesis seriously, but the study described above is a good addition, for example, to the meta-analysis published last May in The American Journal of Clinical Nutrition (Cusack et al., Blood type diets lack supporting evidence: a systematic review).
The blood group diet has no scientific basisMedicine and health according to FOX News: No science behind blood-type diets, researchers say
Belgian scientists set out to identify evidence that the blood type diet is actually as effective as it is said to be.
So, having studied all possible scientific sources, the researchers came to the conclusion that the only, and even then an indirect connection, between the blood type and the corresponding features of the diet, is that a low-fat diet has a different effect on cholesterol levels in people with different blood groups. In addition, previous studies have found a link between blood type and the risk of developing blood clots, certain types of cancer, and heart attack.
At the same time, no scientific project has proven that products supposedly compatible with a certain blood type contribute to weight loss or improve overall health.
Dr. Vanderkhov's team collected data from 1,415 scientific projects concerning the effect of diet by blood type on human health. Of these, only 16 sources were selected for the second stage of the study. But in just one project, the results were reliable. However, this research program studied the relationship between blood groups and cholesterol levels, which is not directly related to the fight against excess weight.
Recall that the blood type diet became popular back in 1996 after the publication of Peter D'Adamo's book on this method of weight loss. But so far there has not been a single study in which the benefits of such a power system have been proven.
So, in order to determine how effective this diet is, it is necessary to attract participants with different blood groups who would eat certain foods. In addition, results from control groups whose members would still eat would be needed.
It is necessary to approach the issue of diet extremely responsibly and trust only the already proven and scientifically proven methods of combating excess weight.
Portal "Eternal youth" http://vechnayamolodost.ru17.01.2014