A Review of the Blood Type Diet: What Do Genetics Have to Do with Eating and Weight Loss?

In recent years, obesity has spread like wildfire in places where the culture promotes increased consumption of high-calorie foods and less activity. But not everybody in these circumstances will become obese, and not all obese people will have the same body fat distribution or health problems. Groups from the same ethnic or cultural heritage may display these differences within families. The pandemic of obesity cannot be the result of the sluggish pace of genetic change in human populations. However, the variation in how people respond to their environments raises the likelihood that genes play a role in the development of obesity.

Since over two decades ago, the Blood Type Diet has gained popularity. This diet's proponents contend that the most excellent foods for your health depend on your blood type. Many individuals vouch for this diet and say it has saved their lives.

In 1996, a naturopathic doctor named Dr. Peter D'Adamo promoted the blood type diet, commonly referred to as the Blood Group diet. According to him, each blood type indicates a genetic characteristic of our forefathers, including all the sort of diet they need to survive.

Every blood type should eat in the following manner

Type A − Also referred to as the farmer or agrarian. A type A should consume a diet high in vegetables and devoid of "toxic" red meat. This closely mimics a vegetarian diet.

Foods to consume if you have blood type A

  • Fruits such as peaches, berries, and apples,

  • Soybeans,

  • Tofu,

  • Grainy foods,

  • Almonds and seeds,

  • Restrict your consumption of beans, turkey, shellfish, and dairy.

Type B − Known as the nomad. These people can have certain dairy products, vegetables, and most meats (except for chicken and hog). Wheat, corn, lentils, tomatoes, and a few other foods must be avoided.

Foods that people having blood type B should eat are

  • Fresh- green vegetables,

  • Fruits,

  • Eggs,

  • Low-fat dairy,

  • Green leafy vegetables,

  • Legumes,

  • Grains,

  • Meats are other than chicken and hog.

Type AB − Known as the enigma. Described as a hybrid of classes A and B. Seafood, tofu, dairy products, legumes, and grains are among the foods that can be consumed. They should avoid kidney beans, corn, meat, and poultry.

Seafood and lamb are appropriate foods for blood type AB. Also

  • Fruits,

  • Eggs,

  • Dairy

  • Cereals

  • Seeds

  • Nuts

  • As well as tofu.

Type O   Referred to as the hunter. It is a high-protein dietary habit mainly consisting of meat, fish, chicken, and some fruits and vegetables, with slight grain, legume, or dairy consumption. It is quite similar to the paleo diet.

In contrast to the typical Western diet of manufactured junk food, these four diet plans are mostly centered on actual, healthful ingredients.

Thus, even though your health improves while you follow one of these diets, it may not necessarily be because of your blood type. Perhaps the health advantages are only a result of your consuming better food now than you did.

  • Lean meat

  • Fishes

  • Poultry

  • Fruits

  • Vegetables

  • Along with a moderate amount of grains

  • Soybeans

  • Eggs

  • And dairy products

are foods that people having blood type O should eat.

Diet and Blood Type Are Suggested to Be Linked by Lectins

The blood type diet's main hypotheses revolve around a class of proteins known as lectins.

A large class of proteins known as lectins may bind sugar molecules. These compounds are considered antinutrients and may harm the lining of the digestive tract. The blood type diet hypothesis states that several lectins in the meal primarily target certain ABO blood types.

It is alleged that ingesting the incorrect lectins might cause red blood cells to clump together. There is proof that a tiny proportion of raw, uncooked bean lectins might have agglutinating action unique to a particular blood type

Overall, it seems that most agglutinating lectins respond with all ABO blood groups. In other words, except for a handful of types of raw legumes, lectins in the meal are not blood-type specific

Since most beans are soaked and/or boiled before eating, eliminating the potentially hazardous lectins, this might not have any application in the real world.

How Effective Is the Blood Type Diet?

The blood type diet is not supported by scientific research. Other research has revealed certain advantages of the diet that are not tied to blood type, whereas several studies have refuted the diet.

According to research, the diet may be well-liked because it strongly emphasizes exercise, consuming healthy foods, and avoiding processed meals. These guidelines are frequently suggested by specialists and dietitians to enhance or maintain health and are connected to various diets.

Additionally, two distinct groups of research subjects, one who adheres to the diet and the other who does not, both of whom have the same blood type, must be used to examine the theories underlying the diet. This will influence how well the blood type diet works.

Complications Associated with Blood Type Diets

The blood type diet continues to be a hot issue in diet culture, although there is no scientific evidence to support it.

The blood type diet's four diets strongly emphasize eating wholesome meals and exercising since both are good for your health. This diet may still be dangerous, though. For instance, the O blood group diet places a significant emphasis on the consumption of animal protein, which may result in additional health issues.

You should not follow the blood type diet plan without consulting your doctor because your blood type does not indicate how healthy you are.

Weight Loss and Genetics

Interesting things may be said about how genetics affect body composition, especially adipose tissue.

Depending on your age, sex, and ancestral genetics, your body is built to store fat in particular locations. Women tend to accumulate more body fat than males since fat is crucial for reproduction. The recommended amounts of essential fat for males and women are 3 and 8 to 12 percent, respectively. But whether or not a woman would store her body fat in her upper body as opposed to her hips and thighs depends on her genes. The accumulation of body fat, irrespective of gender, can significantly affect health risks. Men, in contrast, often store fat in the belly, but they may also retain it in other locations.

Your body's makeup could be predetermined by heredity. According to set points, your body may have a preferred weight range. This may increase the chance of weight gain after dieting, according to certain theories. According to the set point hypothesis, dietary choices or environmental circumstances may affect how a person's genetic makeup determines their optimal weight range. In this context, one paper queries if Western diet consumption, which often consists of big portion sizes and high-calorie meals, obscures the body's regular weight control.

Is it possible to reduce weight despite your genetic makeup?

At least part of your weight growth or decrease explanations are encoded in your DNA. Some people's ability to lose weight will be hampered by genetics, and dieters who have a particular genetic variation may have slower weight loss than others.

The best approach to determine if genetics affect your ability to lose weight is with a DNA health test. When you are aware of what you are against, you may fight to overcome your genetic makeup and retake control by altering your behaviors, way of life, and thinking because the more comprehensive picture includes factors other than your DNA. We must all eat healthfully, exercise frequently, and commit to healthy behaviors to keep in shape.


When a particular condition, such as Prader-Willi syndrome or Bardet-Biedl syndrome, is present, genetics can directly cause obesity.

Genetic predisposition to disease, however, is not always accurate. To be overweight, a person may require both genetics and behavior. Occasionally, a person's vulnerability to obesity may be increased by several genes and may require environmental conditions, such as an abundance of food or insufficient physical exercise.

Updated on: 06-Feb-2023


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