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.
最后一段开头为什么是however？
