There's only one test you have to take to go on the Blood Type Diet, and everyone can pass it. All you need to do is find out your blood type. The diet plan, popularized by naturopathic physician Peter D'Adamo, makes food and exercise recommendations based on an individual's blood type. However, before starting any diet, it's best to check with your doctor to determine what type of menu is right for you.
Type Test
There are a number of ways to find your blood type. First, check with your doctor. Your type may already be on file. If not, a few drops can be drawn for testing. You can also find your blood type by signing up to give a blood donation. At-home testing kits also are available to determine your type. There are eight common blood types.
Blood Type
Types are determined by the presence or absence of A and B antigens, which are substances that can trigger an immune response if they're foreign to the body. That's why health workers need to know your type before you can receive a blood transfusion. Some antigens might trigger your immune system to attack the transfused blood. The four major blood groups are A, B, AB and O. Type O has no antigens on red cells, but all four groups have an antigen called the Rh factor. If it's present, you have positive-type blood. If it's absent, you have a negative type.
Blood Type Diet
The Blood Type Diet is based on D'Adamo's theory that food proteins are digested differently by people who carry the various antigens of different blood types. He recommends a high-protein/low-carbohydrate diet for people with type-O blood and a vegetarian-style diet for people with type-A blood. Those who have type-B or type-AB blood can eat a wider variety of foods. D'Adamo says there are specific foods that should be avoided by people in each of the blood type groups, too.
Evidence
Medical professionals from institutions such as the Mayo Clinic and University of Southern California argue there is no scientific evidence to support the Blood Type Diet theory. While it's possible to lose weight on the diet plan, much of that weight loss can be attributed to the lack of processed foods on the plan and the restrictive menu, rather than any blood-type compatibility issues. Federal health officials recommend eating a well-balanced diet consisting of vegetables, fruits, grains, protein and dairy products.
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