The Blood Type Diet became popular after the publication in 1996 of "Eat Right 4 Your Type" by Peter D'Adamo, a naturopathic physician. D'Adamo argues that blood type determines each person's ideal diet for healthy weight and optimal health. Although the system offers some sound recommendations, such as cutting out processed foods in favor of whole foods, it can be restrictive and may not provide balanced nutrition.
Blood Type Diet
The Blood Type Diet is based on the idea that the four human blood types emerged in response to environmental influences and that eating in accordance with those early influences will result in health and vitality. For instance, since blood type A may have developed in an agriculture-based culture, people with blood type A are advised to eat a mainly vegetarian, organic diet. Blood type B may have come from the herding tribes of the Himalayan highlands, and D'Adamo recommends type Bs eat a diet based on red meat, green vegetables and dairy. Type Os are ruled by the ancient fight-or-flight response and should eat mostly animal products, and type ABs should choose seafoods and cultured dairy like yogurt and should eat small, frequent meals.
Blood Types and Exercise
D'Adamo also provides guidance on the type of exercise each blood type should get. He believes type As should choose exercise that calms the nervous system, like golf, long slow walking or yoga. For type Bs, D'Adamo recommends moderate exercise like hiking and tennis. According to this system, type ABs will benefit from a blend of moderate and calming exercise, and type Os need vigorous exercise like running.
Evidence
Although the Blood Type Diet has developed a loyal following, New York University's Langone Medical Center experts say the theory that diet and exercise should be determined by blood type is not supported by scientific evidence. Harvard University's Medical School supported this argument in its 2005 Harvard Health Letter, pointing out that the diet's careful focus on food combinations and choices leads to reduced portion size and more thoughtful eating habits, which may be the real cause of any weight loss.
Tips and Warnings
Any diet that severely restricts or eliminates certain food groups will make it difficult for you to get the balance of nutrition your body needs. While vitamin and mineral supplements can help, they are not a replacement for nutrition from food sources. These diets may not be safe for everyone. See your doctor before starting any diet plan, especially if you have any health conditions. A nutritionist or other health care professional can help you formulate a diet and exercise plan that's right for you.
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