The blood type diet suffers an awful lot of bashing from those who don't understand it. Many well-intentioned (but misguided) people on the Internet who have written reviews about it have not actually read a single chapter of the book. They have simply heard about it, decided the idea is preposterous, and immediately (and irresponsibly) posted their opinions on websites.

Yet, there is quite a bit of solid scientific evidence backing it up. In my own experience with it and my observations of people on it, I have seen tremendous improvements in health and weight loss, just as Dr. D'Adamo, originator of the diet, predicts.

How The Blood Type Diet Works

The blood type diet operates from the principle that no two people are exactly alike — not in fingerprints, lip prints, or voiceprints. In the same way, each person has different nutritional requirements. The only way to achieve lasting health is to accommodate each person's specific needs.

Dr. Peter J. D'Adamo, naturopathic physician and author of, "Eat Right For Your Type" believes that the relationship between your blood type and your dietary choices is the key to your health, weight, strength and longevity.

Dr. D'Adamo doesn't believe "one diet fits all." We've all seen how some people respond beautifully to certain diets, while others get nowhere on the very same diet. This is due to genetic differences in the blood. Dr. D'Adamo provides four different diets for the four blood types.

He has studied the four blood types — O, A, B, and AB — and found that each of them evolved over a long period of time and adapted to the naturally available diet.

The Four Blood Types and Their Corresponding Blood Type Diets:

Type O — The original hunter-gatherers and the largest blood type group. They ate the meat they hunted along with berries, nuts, and fruits and very few carbohydrates. They do best with a high protein, low carbohydrate diet.

Type A — The domesticated agrarians that evolved from the hunter-gatherers who cultivated grains and livestock. Their digestive tracts and immune systems adapted to a more agrarian diet and lifestyle. They developed the ability to absorb nutrients from cultivated grains. So they do best on a vegetarian diet high in carbohydrates and low in fat.

Type B — Nomadic tribes that migrated to Europe, Asia, and the Americas from the Eurasian plains down to the Indian subcontinent. Their's was a varied diet of fermented diary products, cheese, plenty of meats, wild game, vegetables, fruits, and rice.

Type AB — Created by the modern intermingling of Type A and Type B groups. Very few people have this blood type but they thrive on a selective combination of the Type A and Type B blood type diets.

What Difference Does Your Blood Type Make?

Dr. D'Adamo's research revealed that a chemical reaction occurs between your blood and the foods you eat, according to your genetics. Your digestive and immune systems favor certain foods and cannot digest others.

Just as certain blood types should not ever exchange blood (giving Type A a transfusion of Type B blood is almost certainly fatal), Dr. D'Adamo believes blood types should not exchange diets. It's best if your diet sticks to your natural genetic rhythm.

His research shows that lectins, a type of protein found in foods, have agglutinating properties, similar to glue, that affect your blood. When the wrong food for your blood type is eaten, the lectins immediately start to clump up as your organs and blood try to reject it.

Although lectin protein is present in many foods, the problem is that it can't be digested by the wrong blood type. Lectins vary according to their source. They make different combinations with different foods. Each of these foods can be dangerous for some blood types, while beneficial for others.

What Does The Blood Type Diet Have To Do With Losing Weight?

The wrong food for your blood type can cause weight gain and illness — like cardiovascular disease, diabetes, liver problems, and a weakened immune system. Whereas the right food for your blood type brings about optimal health, longevity, and weight loss!

Dr. D'Adamo clarifies that certain foods make certain blood types put on weight. Eliminate those foods from your diet and you'll experience weight loss.

The trick is knowing what blood type you are and what foods are beneficial for you and which are not.

Today's Popular High-Protein Diets Are Really
Variations On The O Blood Type Diet

Lately, many high-protein diets such as the Atkins diet, the South Beach Diet and...
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