Leena Watts
The blood type diet is a system of eating that categorizes foods as beneficial, neutral, or harmful based on a person's blood type and other factors. Naturopathic physician Peter J. D'Adamo created the diet in 1996, claiming that eating foods that were common when your blood type evolved may help your body digest food more easily. The first step to starting this diet is to determine your blood type through a blood test. Once you know your blood type, you can plan your meals around the foods that are considered optimal for your blood type. While some people have experienced weight loss and health improvements on this diet, there is limited research supporting the benefits of the blood type diet, and it has not been proven in any clinical trials.
| Characteristics | Values |
|---|---|
| Creator | Naturopathic physician Peter J. D'Adamo |
| Date Created | 1996 |
| Premise | Eating according to your blood type can help you be healthier, live longer, and achieve your ideal weight |
| Theory | The earliest humans with type O blood were hunter-gatherers and ate high-protein diets; type A blood evolved when humans began farming and had more vegetarian diets |
| Food Recommendations | Type O: high-protein, meat, vegetables, fish, fruit, limited grains, beans, legumes; Type A: fruit, vegetables, tofu, seafood, turkey, whole grains, limited animal protein; Type B: meat, fruit, dairy, seafood, grains; Type AB: dairy, tofu, lamb, fish, grains, fruit, vegetables |
| Exercise Recommendations | Type O: high-intensity aerobic exercise; Type A: low-intensity activities, meditation |
| Effectiveness | No scientific evidence that blood type diets work; improvements in health may be due to eating healthier foods and fewer processed foods |
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What You'll Learn
Know your blood type
Knowing your blood type is the first step to starting the blood type diet. There are four major blood groups: O, A, B, and AB, categorised based on the presence or absence of two antigens, A and B, on the surface of your red blood cells. Your blood type is inherited from your biological parents.
If you don't already know your blood type, you can request a test from your doctor, or you may be able to get your blood type confirmed while donating blood.
The blood type diet was created by naturopathic physician Peter J. D'Adamo in 1996. The diet is based on the theory that your blood type determines the best foods for you, according to what your ancestors with the same blood type ate. For example, D'Adamo claims that the first humans had type O blood and were hunter-gatherers, so they ate fewer carbohydrates and more protein. On the other hand, those with type A blood descended from farmers, so D'Adamo recommends a diet with more vegetables.
It's important to note that there is limited scientific evidence supporting the blood type diet. Some studies have shown improvements in certain health markers for those following the diet, but these improvements were unrelated to blood type. Additionally, there is no research to support the claimed benefits of the diet.
Despite the lack of scientific evidence, some people believe that consuming certain foods can be beneficial for specific blood types.
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Plan meals according to your blood type
The blood type diet, popularised by Dr Peter D'Adamo in 1996, categorises food as beneficial, neutral, or harmful based on a person's blood type and other factors. The diet is based on the theory that blood types evolved from different societies, and each has an optimal diet.
Type O
Known as the "Hunter", this is supposedly the oldest blood type and is said to thrive on a high-animal protein diet. It is believed to have originated from hunter-gatherers, who consumed fewer carbohydrates and more protein.
Type A
Known as "Agrarian", this blood type is associated with a mostly vegetarian diet, with poultry and fish as the only recommended animal proteins. People with this blood type are believed to have descended from farmers and can digest carbohydrates and vegetables easily but have a harder time digesting animal protein and fat.
Type B
Known as "Nomadic", this blood type is said to have originated from nomadic tribes with diets rich in meat and dairy. Those with type B blood can supposedly digest fat more efficiently. This diet includes a lot of dairy.
Type AB
Known as "Enigma", this blood type is recommended a mixture of the type A and B diets.
It is important to note that there is limited research supporting the blood type diet. Some studies have found improvements in certain cardiometabolic risk factors among those following the diet, but these improvements were unrelated to blood type. Additionally, other studies have found no additional health improvements or benefits from following a blood type diet compared to a standard healthy diet.
Before starting any new diet, it is always recommended to consult with a healthcare professional or a registered dietitian, who can help create a suitable eating plan based on your individual needs and health goals.
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Understand the diet's theory
The blood type diet, also known as the blood group diet, was popularised in 1996 by Dr Peter D'Adamo in his book, Eat Right 4 Your Type. The theory behind the diet is that the ABO blood type should match the dietary habits of our ancestors and that people with different blood types process food differently.
According to the theory, individuals adhering to a diet specific to their blood type can improve their health and decrease their risk of chronic illness, such as cardiovascular disease. D'Adamo claims that the optimal diet and exercise regimen for any one individual depends on their ABO blood type. Each blood type represents the genetic traits of our ancestors, such as the diet they evolved to thrive on.
D'Adamo's theory suggests that the first humans had type O blood. Since they were hunter-gatherers, they ate fewer carbohydrates and more protein. People with type A blood are believed to have descended from farmers, which is why D'Adamo urges a diet with more vegetables for this group. He thinks that people with type B blood can digest more fat because they supposedly evolved from nomadic tribes, whose diets were rich in meat and dairy.
The blood type diet requires a regimen called compliance, which refers to eating "beneficials". Beneficials are chosen for each blood type, based upon the lectins, or molecules, which the food contains. On this diet, people are defined as being secretors or nonsecretors. These terms refer to an individual’s ability to secrete blood-type antigens into bodily fluids. What you eat is partly based upon your secretor status.
It is important to note that there is little scientific research to support the benefits of the blood type diet. A 2013 study found no evidence of any benefit from a blood type diet. A 2014 study found that while people following any of the blood type diets had some improvement in certain cardiometabolic risk factors, those improvements were unrelated to blood type. Similarly, a 2021 study of people on a low-fat vegan diet found no connection between blood type and lipid levels or other metabolic measures.
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Know the potential benefits and drawbacks
The blood type diet, popularized by Dr. Peter D'Adamo in 1996, suggests that there is an optimal diet and exercise regimen for each blood type. According to the theory, eating the right foods for your blood type can improve health and decrease the risk of chronic diseases.
Potential Benefits
The blood type diet has gained popularity due to its supposed health benefits, such as weight loss and improved digestion. For example, the A-positive blood type diet is primarily vegetarian, and people who have followed this diet have reported weight loss and lowered cholesterol. The general idea of the blood type diet is to reduce processed foods, added sugars, and consume more lean meats, fruits, and vegetables, which can be beneficial for overall health.
Potential Drawbacks
However, there is little to no scientific evidence supporting the blood type diet. Studies have found no link between a person's blood type and the health benefits experienced when following a specific diet. For instance, a 2021 study showed that a plant-based diet provided no additional health improvements for people with type O blood compared to those with other blood types. Similarly, a 2018 study found no association between blood type and the development of heart disease in overweight adults following a blood type diet.
Furthermore, the blood type diet can be highly restrictive and challenging to follow, especially for families with varying nutritional needs. It may also be difficult to obtain all the necessary nutrients while adhering to the diet, potentially impacting overall health and well-being.
While the blood type diet may provide some health benefits, it is important to consult a healthcare professional before making significant dietary changes, as individual needs may vary.
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Consult a doctor or dietitian
Before starting the blood type diet, it is important to consult a doctor or dietitian. This is because everyone responds differently to nutrition plans, and you should always talk to a healthcare professional before making any significant changes to your diet.
Your doctor can request a blood test to determine your blood type if you don't already know it. This is important because the blood type diet suggests that your ABO blood group may determine the best foods for you to eat. Once you know your blood type, you can plan your meals and snacks around the recommended foods for your specific blood type.
However, it is essential to note that there is limited scientific research supporting the claimed benefits of the blood type diet. While some people may experience health improvements while following this diet, it may be due to eating healthier foods in general rather than the specific blood type recommendations.
Additionally, certain blood type diets may restrict some food groups, such as dairy, which could be harmful to children, as it is critical for their growth and development. Therefore, consulting a doctor or dietitian can help ensure that you are meeting all your nutritional needs while following the blood type diet. They can also advise you on any necessary lifestyle changes to ensure you are living a healthy life.
Furthermore, if you have any ongoing health conditions, it is especially important to check with your doctor before starting the blood type diet. They can assess your individual risk of developing certain diseases and provide guidance on whether this diet is suitable for your specific health needs.
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Frequently asked questions
The blood type diet is a system of eating that categorises foods as beneficial, neutral, or harmful based on a person's blood type and other factors.
The blood type diet is based on the theory that blood type is closely tied to our ability to digest certain types of foods, so that the proper diet will improve digestion, help maintain ideal body weight, increase energy levels, and prevent disease.
The foods you eat on the blood type diet depend on your blood type. For example, those with type O blood are recommended to eat a lot of meat, vegetables, fish, and fruit but limit grains, beans, and legumes. Meanwhile, those with type A blood are recommended to eat fruit, vegetables, tofu, seafood, turkey, and whole grains but avoid meat.
You can request a blood test from your doctor to find out your blood type, or you might be able to get your blood type confirmed while donating blood at a blood drive.
The blood type diet may yield weight loss and other positive results because it is highly restrictive and eliminates foods that are known to adversely affect health. However, there is no scientific evidence linking a person’s blood type to their need to avoid or eat specific foods.
