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Yahoo
30-07-2025
- Health
- Yahoo
The Blood Type Diet Is Popular Again. Here's What the Science Says.
"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." PEOPLE OFTEN ADOPT different diets for different reasons. They may start eating Mediterranean-style to improve their heart health, or go vegan for ethical reasons. But what about eating according to your blood type? This idea was first introduced in a 1996 book, Eat Right 4 Your Type, by naturopathic physician Peter D'Adamo, which suggested that people could improve their health, live longer, and maintain their ideal weight by eating specific food groups based on their blood type, according to Harvard Medical School. More recently, TikTokers have been talking about the blood type diet and its purported benefits and downsides. But is there any scientific evidence that the diet works? Here's what experts say. What Is the Blood Type Diet? THE BLOOD TYPE diet outlines who should eat what based on their blood type, explains Liz Weinandy, M.P.H., R.D.N., a registered dietitian nutritionist and instructor of practice in medical dietetics at The Ohio State University Wexner Medical Center. This is what the diet suggests, for example: People with type O blood should consume high-protein foods, including meat, fish, fruits, and vegetables, but limit legumes and whole grains. People with type A should eat a vegetarian diet, with lots of fruits, vegetables, and whole grains, and avoid meat. People with type B or AB blood should eat a balanced diet covering all food groups. The theory is that there's a link between blood type and how well you digest different foods, and that eating based on blood type could improve digestion, help maintain a healthy weight, boost energy, and lower your risk of disease. For example, the book links type O is to the earliest humans, who were hunter-gatherers and ate mostly animal proteins. Type A possibly evolved after humans began farming and ate more fruits and vegetables, while B types may have arisen from nomadic tribes who ate dairy. AB eating recommendations are between the suggestions for types A and B. Does It Work? THERE'S NOT ENOUGH scientific evidence to suggest that it does, as no high-quality studies have been done to verify claims about the blood type diet, explains Randy Gould, D.O., a cardiologist at Manhattan Cardiology and a contributor to LabFinder. A 2013 systematic review found no studies showing benefits of a blood type diet. However, a 2014 study suggested that people who followed a blood type diet had lower BMI, waist circumference, blood pressure, cholesterol, and blood sugar—but the improvements weren't actually linked to subjects' blood types. Blood type also wasn't linked to improvements in body weight, body fat, blood lipids, or glycemic control for people who followed a low-fat vegan diet, according to research published in 2021. Any potential benefits of the diet are likely to do with what it encourages people to eat and not eat, rather than their actual blood type. 'All three types of diets for different blood types encourage many fruits and vegetables and also avoidance of ultra-processed foods,' Weinandy says. 'This is healthy for anyone.' It's also important to note that blood type may play a role in other aspects of health, Dr. Gould says. Some studies have shown that people with type O blood have a lower risk for heart disease compared to people with types A, B, and AB. And, people with type A or AB may be at a higher risk for gastric cancer, and types A, B, and AB at a higher risk for pancreatic cancer, according to Northwestern Medicine. Who Should (and Shouldn't) Try the Diet? ONE BARRIER TO trying the diet is that most people actually don't know their blood type, according to the American Red Cross. To find out, you can ask your doctor to test it, or if you donate blood, they can likely tell you. Trying the blood type diet could be beneficial for people who don't normally eat many fruits, vegetables, or whole grains, Dr. Gould says. However, it's 'very prescriptive and lacking in evidence,' Weinandy says. 'Cutting out entire food groups like dairy or even wheat when it likely isn't necessary can cause inadequate nutrient intake.' She doesn't recommend the blood type diet to anyone: 'Like most unproven diets and claims, there may be some truth or good points to it—in this case, eating a lot of whole plant foods—but it's surrounded by negatives like cutting out food groups.' Instead, Weinandy suggests following the Mediterranean diet, which she says is less restrictive, includes a wide range of food groups, and has lots of research to show it improves health. You Might Also Like The Best Hair Growth Shampoos for Men to Buy Now 25 Vegetables That Are Surprising Sources of Protein
Health Line
29-05-2025
- Health
- Health Line
What Is the A-Positive Blood Type Diet?
Some people believe that eating certain foods, including soy protein and certain kinds of grains, may benefit people with an A-positive blood type. The concept of blood-type diets was originally put forth by the naturopathic physician Dr. James L. D'Adamo. His son, Dr. Peter J. D'Adamo, popularized the diet in his book, ' Eat Right 4 Your Type.' He claims that differing blood types evolved at various points in our genetic history and that your blood type should determine what you eat and how you exercise. Blood type diets are a system of eating that categorizes foods as beneficial, neutral, or harmful. It's based on a person's blood type and other factors. D'Adamo claims foods harmful to your blood type cause an agglutination reaction. This makes blood cells stick together, increasing the risk of disease. Read on to learn more about this diet and D'Adamo's claims. Eating foods based on blood type The blood type diet requires a regimen called compliance. This 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. This is why the diet is known as an individualized plan. Food ratios are also provided for each blood type group. These are further broken down into ratios specifically recommended for people of African, Caucasian, and Asian descent. Supplements are recommended for blood-type diets, which are sold on D'Adamo's website. Theoretic origins of blood types According to Dr. D'Adamo, the A-positive blood type became prevalent during the early years of the agricultural age. He theorizes this is why people with this blood type can readily digest vegetables and carbohydrates, but have a difficult time digesting animal protein and fat. The A-positive blood type diet is primarily vegetarian. D'Adamo believes people with this blood type have less-than-robust immune systems and are prone to anxiety. His diet plan promises: weight loss less disease more energy better digestion As with any diet, people may try this plan in order to lose weight or for other health benefits. Weight loss and lowered cholesterol have been reported by people who have tried this diet. However, there's no evidence the theory underlying this diet caused these results. Like many other food plans, this plan stresses the avoidance of: processed foods foods high in sugar simple carbohydrates These diet measures are known to benefit anyone's health, regardless of blood type. What diet is best for people with A+ blood type? D'Adamo recommends people on the A-positive blood type diet eat an organic, vegetarian, or almost-vegetarian food plan. Foods that D'Adamo recommends to eat include soy protein, such as tofu certain grains, such as spelt, hulled barley, and sprouted bread walnuts, pumpkin seeds, and peanuts olive oil certain fruits, such as blueberries and elderberries certain kinds of beans and legumes certain vegetables, especially dark, leafy greens, such as kale, Swiss chard, and spinach garlic and onions cold-water fish, such as sardines and salmon limited amounts of chicken and turkey green tea ginger The diet recommends eating protein at the start of the day. Canned sardines or a smoothie made with silken tofu and goat milk may be a good option. Limited amounts of animal protein, such as turkey and eggs, are allowed on this diet plan. They may be eaten for breakfast. Vegetables, fruits, and the allowed grains may be eaten at any meal. What foods should people with type A+ blood avoid? The list of foods people with A-positive blood should avoid is extremely extensive. It includes, but isn't limited to: beef pork lamb cow's milk potatoes, yams, and sweet potatoes certain vegetables, such as cabbage, eggplant, tomatoes, peppers, and mushrooms lima beans certain fruits, such as melons, oranges, strawberries, and mangos poultry other than chicken and turkey, such as duck venison fish, such as bluefish, barracuda, haddock, herring, and catfish some grains and grain products, such as wheat bran, multigrain bread, and durum wheat refined sugar refined carbohydrates, such as white flour and white bread oils other than olive oil artificial ingredients most condiments Does the blood type diet work? Medical conditions which D'Adamo states are associated with this blood type include: cancer diabetes anxiety disorders cardiovascular disease However, there's no scientific evidence that the blood-type diet works or that it alleviates any specific health conditions. For instance, a 2021 study found that among 68 subjects who ate a low-fat, vegan diet, those who had type A blood did not experience any additional health benefits compared to those with other blood types. Another 2018 study found that no type of blood has any effect on the association between following one of the blood-type diets and the chance of developing heart disease in overweight adults. One older 2014 study found that adherence to the A-positive blood type diet might yield benefits, such as: reduced body mass index (BMI) blood pressure serum triglycerides cholesterol lower waist circumference However, these benefits weren't seen to be influenced by, or associated with, study participants' blood types. What are the risks? While no specific risks have been identified to date given the limited research, this diet is restrictive and may be difficult to follow. It's important that anyone striving to follow this eating plan makes sure they're getting broad-based nutrition from a wide range of foods, including protein sources. Frequently asked questions What is special about A+ blood? Having A-positive blood simply means that you've inherited it from your parents from various possible combinations: The positive marker is related to the presence of certain antigens in your blood along with a protein known as the rhesus (Rh) factor. There's no scientific evidence that having A-positive blood is anything unique. In fact, it's quite common. However, because it occurs in 36% of Americans, it means that it's one of the types most easily to find or donate for a transfusion. Can blood type A eat sugar? The A-positive diet recommends avoiding refined sugar and foods that are high in sugar. There's no evidence there's a specific benefit from doing this for people with A-positive blood. That said, this is a common recommendation in other diets and by many nutritionists that is likely to benefit anyone. Are eggs OK for blood type A? The A-positive diet also recommends limiting eggs. Eating them in small amounts during breakfast is optimal, according to the diet. There are some known risks associated with eating eggs. First, they may increase cholesterol, and eating one egg or more daily may be associated with the chance of developing certain cancers according to some research, however, these results were based on studies in a hospital setting.. That said, as with sugar, there is no evidence that eating or avoiding any food is specifically beneficial to a person with a particular blood type. Eggs are still a nutritious food that can be a good source of protein in any diet. In most cases, eating 1-2 eggs daily isn't likely to be harmful for most young, healthy adults. This has been confirmed by recent research findings. One egg daily may even help support better cognitive abilities in older adults, according to additional research. The takeaway Blood-type diets may yield weight loss and other positive results because they're highly restrictive. They also eliminate foods that are known to adversely affect health. However, there's no scientific evidence linking a person's blood type to their need to avoid, or eat, specific foods. If you do decide to follow this plan, make sure to eat as wide a range of foods as possible so you get enough nutrition. You can also talk to your doctor about your individual risk of developing a disease. They can help you make lifestyle changes to ensure you're living your healthiest life.
