18.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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