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In
1901, Karl Landsteiner, an Austrian scientist, discovered that there are four
types of blood. These four blood types were named A, B, AB and O. People have
one of these four types. Blood type O is the most common around the world.
Blood type A is the second most common, and type AB is the least common. If
people with type A blood are given type B blood, or people with type B blood
are given type A blood, they will probably die.
In
1927, a Japanese doctor, Furukawa Takeji, carried out research and came up with
the idea that people with different blood types also had different
personalities(性格). He said that
people with type A blood are usually calm and serious; people with type B blood
are curious, cheerful and outgoing; people with type O blood are generous and
trustworthy; while those
with type AB blood are often caring, original and careful.
More
recently, a doctor in the United States wrote a book that links blood types and
what people eat. For example, his book suggests people with type O blood should
eat more meat and less bread. A diet for people with type A blood includes more
vegetables. His book, Eat Right for Your Type, has been a hit with
people who want to lose weight. However, Dr. Peter D' Adamo believes that
eating food that matches a person's blood type can help them lose weight. He
thinks it will make the person healthier in other ways, too.