The diet based on a person’s blood type called Eat Right for Your Type has been proven totally ineffective by a new peer reviewed study. The diet, based on a book of the same name that has sold over 7 million copies to date, was developed by author and naturopath Peter D’Adamo, who claims that people’s bodies utilize food in different ways depending on their blood type. This new study supports an earlier study by the American Journal of Clinical Nutrition which also found the blood type diet to have no effect on weight loss.
Adherence to certain ‘Blood-Type’ diets is associated with favorable effects on some cardiometabolic risk factors, but these associations were independent of an individual’s ABO genotype, so the findings do not support the ‘Blood-Type’ diet hypothesis.
The book Eat Right for Your Type has the noble distinction of being a New York Times bestseller, and everyone seems to know someone who has tried it, or perhaps has tried it themselves. Even the controversial diet guru Dr. Oz endorsed the diet despite the fact that the eating plan is totally ineffective. Having a famous personality like Dr. Oz endorse the diet most likely did much to popularize the plan and undoubtedly assisted in selling more copies of the book. However, researchers who participated in the study say “We can now be confident in saying that the blood type diet hypothesis is false.”
As with any diet that emphasizes eating healthfully and exercising, there will be certain cardiovascular and other health benefits realized by the person following the plan. Much of the advice in D’Adamo’s book focuses on low-fat, healthy foods, and the type O plan recommends following a high protein diet that severely restricts or eliminates wheat. Because of the restrictions contained in the diet plans detailed in the book, a person’s caloric intake would be automatically reduced, since they would be cutting out certain food groups.
Research over the last 50 years has consistently shown that overall, calories ingested versus calories burned is what determines weight loss. Therefore, any weight loss realized by those following the blood type diet most likely stems from a reduction in calories, and not from anything having to do with their blood type.
In an article about the Eat Right for Your Type blood type diet, Dr. Melina Jampolis states that the type O as well as the other weight loss diets recommended in the book “would not be healthy and balanced” because they eliminate entire food groups. She also says the diets “are complicated, not practical in some cases (some foods are hard to find and unfamiliar to the average person), and can be challenging (for example if families are made up of numerous blood types).”
Now, the Eat Right for Your Type blood type diet has been proven totally ineffective by a new study. The quest for the perfect diet plan will continue for millions of people battling weight issues, but experts still recommend a balanced, low calorie, healthful eating plan along with plenty of exercise as the best way to shed pounds.