Did you know that there is a diet for each type of blood? If you are from the AB group, it is better to eat one kind of food and if you are from another group, other foods. At least that is what the blood group diet suggests, and it is the idea that is reflected in the book ” Eat Right For Your Type, written by naturopath Peter J. d’Adamo and that has been published in 60 countries.
The diet of the blood group, in its many variants, proposes that each one should follow a special diet in relation to the blood group he has. In this way our inner nature is respected because we avoid the foods that can cause cardiovascular diseases, diabetes, cancer … That is the key idea of the blood group diet, but let’s see in more depth what it consists of …
Diet of the blood group of naturopath Adamo
Adamo’s proposal is very simple: blood groups reflect our evolutionary history and our diet, the food we eat every day must be carefully selected according to our blood group. According to Adamo, blood groups have evolved in a certain succession, depending on changes in the lifestyle of our ancestors, and each blood group would reflect the particular diet followed by the subjects in whom it evolved.
The group O , according Adamo, is ancestral, the first to appear. We would be talking about the blood type typical of hunters and gatherers of prehistory. The most suitable diet for these people involves a high consumption of meat, fish, poultry and certain types of vegetables and fruits. And the consumption of dairy products, legumes and cereals would be scarce.
The group A is the producer and have evolved hand in hand with the development of a society based on agriculture. The recommended diet is basically vegetarian, that is, it excludes meat, which according to this diet can even be harmful (diet followers talk about it being toxic … but this would be too radical if it is generalized in this way).
The B group is the nomadic group, which has evolved among the wandering tribes of the steppes: the optimal diet would be based on meat, especially meat from poultry and pigs, vegetables and dairy products. Instead, wheat and corn, lentils and tomatoes should be excluded.
The AB group is an enigma for Adamo, a group that from their point of view has evolved recently and that should consume fish, tofu, dairy products and cereals. While they have to avoid certain types of beans, corn, beef and poultry.
Many enthusiasts say that after following the diet of the blood group they have reported improvements in line and health. In fact if you do a search through the network you will see an avalanche of anecdotal reports that seem to testify to the benefits and benefits of following this diet of the naturopath Adamo.
Diet of the blood group of Dr. Mozzi
Like any successful diet, including that of Adamo, a series of more or less successful variants, and more or less known, have been generated. That is, when a diet works immediately variants of this diet appear with small changes and with books by new authors … Welcome to the era of consumerism and opportunism. That said, let’s look at Dr. Mozzi’s diet, a precursor to Adamo’s diet that has also been one of the most influential in this area.
Mozzi goes a little further and warns us that there are some foods whose consumption should be limited or avoided regardless of the blood group we have. It is above all gluten and milk, especially when gluten comes from wheat. Mozzi also suggests controlling the consumption of fruit that, in excess, leads to the accumulation of sugars in the blood. And in the same way that Adamo, gives us a list of beneficial or harmful foods for each blood group. It also indicates neutral foods that do not determine any type of effect, neither positive nor negative, and which would be the foods that anyone can eat:
Group O subjects should avoid gluten, some legumes, milk and cheese. And it would be convenient that they give preference to meat, fish and vegetables.
For group A , the harmful foods are meat, salami, sausages and cheeses, with limited consumption of cereals.
The foods that should be avoided for group B are buckwheat, peanuts and wheat-based foods, while meat and vegetables can be consumed safely, especially during dinner.
For group AB , red meats and poultry should be avoided, along with corn, buckwheat, wheat and beans. Foods to eat are fish, tofu, leafy vegetables, seaweed and pineapple.
Whether it’s Adamo’s diet or Mazzi’s, we’re seeing that it’s about restrictive diets. This the only good thing is that they eliminate a large amount of pre-packaged and processed foods, and that they favor fresh and poorly handled food. But today, feeling it a lot by the faithful followers of this type of diet, it is known that there must be a balance of nutrients and that the so restrictive diets the only thing they do is that there are problems of lack of minerals, vitamins or proteins in the body. Especially if they are done without medical control and without revision. Remember never to follow diets for your account without medical supervision and without the help of a specialist.
In this case, these are very rigid regimes, with a reduced caloric intake and a relatively sparse selection of foods to be consumed: those who try these diets often report improvements in physical condition and blood parameters. According to the testimonies, the diet of the blood group is very effective, but is it really that way?
What are blood groups?
To understand if the reasoning behind Adamo’s theories makes sense, we must first understand what blood groups are and if they really evolved as indicated by the naturopath.
Blood groups are used to classify the blood of an individual according to the presence of certain circulating antibodies and certain antigens that are found on the surface of red blood cells. These antigens can be proteins, carbohydrates, glycoproteins or glycolipids and can be found not only in red blood cells, but also on the surface of other cell types.
In practice, these antigens are a distinctive species, an “identity document”, that characterizes the erythrocytes of an individual. Currently there are more than 30 different systems to classify human blood groups, and of these, the two most important are the ABO system and the Rh system , two systems that we all know because of their crucial importance for blood transfusions.
The ABO system is what attracted Adamo’s attention. These are two antigens and two antibodies that we find in human blood. The two antigens are antigen A and antigen B, of the structures present on the surface of red blood cells. The different blood groups are due to the presence of three different forms (alleles) of a single gene, located on the long arm of chromosome 9. The gene codes for three different variants of an enzyme that alters the structure of surface antigens of red blood cells. Depending on the presence or absence of an allele of one or another type, we may have blood group O, A, B or AB.
In the blood of an individual there are also antibodies that target antigens other than those of their blood group: a subject with group O, who does not have antigens for A and B, will have antibodies against antigen A and B. That translates in which you can give blood to all blood groups but you can only receive from your own group, from group O.
For the group AB the opposite situation would occur. As it has both antigens and, on the other hand, it does not have antibodies, this subject can only donate to other AB subjects but can receive blood from the rest of the groups.
The evolution of blood groups
Blood groups are not only and exclusively the human being, they are also found in primates and in many mammals and it seems that their evolution, at least in primates, began at least twenty million years ago.
Its function is not clear and it is still at the center of extensive discussions and investigations. Contrary to what Adamo says, the ancestral group is not O but group A.
The O group, in fact, is characterized by a gene that encodes a defective protein that is unable to perform its specific function. It is not logical that the other blood groups have evolved from a defective gene to give rise to enzymes that work perfectly and that they also do it in different ways …
However it does make sense that the ancestral group is the A and that, according to estimates, from this group B originated about three and a half million years ago, while the O variant would be the youngest and it would go back to A million years ago.
The group O is, therefore, the most recent, and yet it is also the most widespread. It seems strange that a variant of a gene that encodes a non-functional protein may become the most widespread in a population. But probably group O gives those who have it some special advantage: according to some researchers, this advantage would be nothing more than greater resistance to malaria, among others.
With it collapses the central pillar in which the theories of Adamo and Mozzi are found . The sequence in which the different blood groups were developed is very different from the hypothesis of both authors of the blood group diet. The appearance of groups B and O is very old, in fact it goes back to the hominid forms that had habits of hunter-gatherers and frugivores, with diets, therefore, that had nothing to do with agriculture, nomadism or pastoralism [1, 2, 3]
Does the diet of the blood group really work? Do you have any scientific basis?
The evolution of blood groups is complex, but it seems that the ancestral group is A and not O, which is what this diet is based on. With all due respect to the theories behind this diet.
The problem of lectins
Another idea suggested by Adamo is that of the lectins. Lectins are proteins capable of binding specific carbohydrates, whose function is to identify and recognize molecules and organisms at the cellular level. The lectins are present in a large amount of food and, although some can be toxic, such as those found in legumes and cereals, others can have positive effects.
Thanks to their selectivity, lectins are used to characterize blood groups, and are widely used in the field of biotechnology.
The fact that different types of lectins can bind to the surface antigens of red blood cells was something that caught Adamo’s attention, and that helped him establish that the consumption of foods containing lectins of a certain type could determine certain harmful responses in subjects who have a particular blood type.
In practice it translates as the presence of lectins could cause intolerances to the foods that contain them.
Actually, legume lectins show a weak ability to cause agglutination of red blood cells, and there does not appear to be any specificity towards certain blood groups. In practice, agglutinins tend to react in a similar way in all blood groups.
In addition, it should be emphasized that lectins can be easily removed by soaking and cooking vegetables, which would be the group of foods that contain them in greater quantity. And since people, in general, eat raw vegetables, the problem seems to have no relevance in the real world. . [Four. Five]
Diet and blood group science
Given the unfounded of the “scientific” premises on which this diet is based, we could expect a total absence of scientific work on the subject but nevertheless there are studies, and recent, on the subject. But everything that glitters is not gold.
Some works have shown that subjects with different blood groups have a different susceptibility to some diseases: those with a group O have a lower risk of contracting some cardiovascular diseases; the subjects of group B have a lower risk of suffering from diabetes; subjects with group O produce a greater amount of gastric acid and are more prone to ulcers, while subjects with group A are more vulnerable to certain types of stomach and pancreatic cancer. These studies suggest that there may be some relationship between the various blood groups and some pathologies.
For this reason, other studies and meta-analyzes have investigated the real effects of the blood group diet. That is, there are studies done on the first studies that suggest this blood group / pathology relationship.
Despite the difficulty of carrying out such studies objectively, the results are quite clear: at the moment there are no data that can confirm the benefits attributed to the blood group diet.
For example, it is worth highlighting the results of a recent study that rigorously examined the effects of various types of diet proposed by Adamo. By combining the diet suggested by Adamo according to the blood type, and the use of this same diet in the rest of the blood groups.
The diets for groups A, AB and O gave positive results in the different markers considered: body mass index, blood lipids, blood pressure and insulin. The relevant data are that the positive results obtained with the group A diet were observed both for the subjects who actually present this group and for the subjects with different blood groups. Same result also for the diet of group AB and that of group O.
Therefore, there is no specific correlation between the benefits observed after the diet and the specific blood group : the improvements are general and are completely independent of the blood group of the subject. Another blow to the theories of the two researchers “according to nature”. [6, 7, 8]
There is no scientific basis to support the blood group diet. Scientific papers and meta-analyzes have shown that if the improvements are there, they are completely independent of the blood group of the subject following a diet or other of those proposed by the authors of the blood group diet.
So, why do so many people confirm the improvement in health status by using the Adamo or Mozzi diet? The answer is simple: these are two types of low-calorie diets, which greatly reduce the consumption of processed foods and low in nutrients. And they motivate to increase the consumption of fresh, minimally processed foods. In other words: those who follow these diets, regardless of the type of blood and the type of diet followed, is to reduce the consumption of junk food and increase the consumption of fresh foods, meat, fish, vegetables.
The fact that something works, more or less, does not mean that it has a scientific validity. That is, in this case it works because of what I have just commented, not because there are toxic foods for certain blood groups or that a blood group should eat certain foods and other group other foods.
The various diet models proposed by Adamo or Mozzi have nothing magical. It is based on vegetarian diets or paleo, full of prohibitions and recommendations that have nothing scientific.
But beware! These types of diets reinforce the idea that there are good and bad foods and phobias, anxiety and serious social limitations are created. And remember that each person is a world and has specific nutritional needs (especially in case of diseases or deficiencies) and that you should never follow diets without medical supervision or help from specialists (nutritionists).
Thus, the diet of the blood group is just another fad diet, a fad diet that is part of pseudoscience and is based on prohibitions. Watch the fashions and do not follow diets because they sound good and are very modern and cool.