In 1901，an Austrian scientist discovered that there are four types of blood．He named them 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 blood type AB is the least common．

In 1927，a Japanese doctor found that people with different blood types have different personalities（性格），too．He said that people with type A blood are usually calm and serious； people with type B blood are cheerful and outgoing； people with type O blood are generous（慷慨的）and honest； while those with type AB blood are often caring and creative．

More recently，a doctor in the United States wrote a book that connects blood types with what people eat．The 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 will make the person healthier in other ways，too．

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