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Weight Loss & Diet Plans

The Blood Type Diet

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The Promise

Could eating a diet based on your blood type -- O, A, B, or AB -- help you trim down and get healthier? That's the idea behind the Blood Type Diet, created by naturopath Peter J. D'Adamo.

D'Adamo claims that the foods you eat react chemically with your blood type. If you follow a diet designed for your blood type, your body will digest food more efficiently. You'll lose weight, have more energy, and help prevent disease.

Does It Work?

It's hard to tell whether the Blood Type Diet works, because there haven't been any studies directly comparing weight loss and health in people who were on the diet against those who weren't.

Only one study has evaluated this kind of diet. It found that people with certain blood types got more of a cholesterol-lowering benefit from eating a low-fat diet. But it didn't prove that the Blood Type Diet works for weight loss.

What You Can Eat

That depends on your blood type. Here's what D'Adamo recommends for each type:

Type O blood: A high-protein diet heavy on lean meat, poultry, fish, and vegetables, and light on grains, beans, and dairy. D'Adamo also recommends various supplements to help with tummy troubles and other issues he says people with type O tend to have.

Type A blood: A meat-free diet based on fruits and vegetables, beans and legumes, and whole grains -- ideally, organic and fresh, because D'Adamo says people with type A blood have a sensitive immune system.

Type B blood: Avoid corn, wheat, buckwheat, lentils, tomatoes, peanuts, and sesame seeds.  Chicken is also problematic, D'Adamo says. He encourages eating green vegetables, eggs, certain meats, and low-fat dairy.

Type AB blood: Foods to focus on include tofu, seafood, dairy, and green vegetables. He says people with type AB blood tend to have low stomach acid. Avoid caffeine, alcohol, and smoked or cured meats.

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