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    It's different between western countries and eastern countries about how to keep healthy. Traditional Chinese doctors believe we need a{#blank#}1{#/blank#}of cool yin and hot yang to be healthy. In China, herbs(草药) are the main medicine but in western countries they use pills.

    In China, {#blank#}2{#/blank#}you are quiet and always tired, Chinese doctors might think you have too much yin. You should eat more hot yang food. It can give you some{#blank#}3{#/blank#}.But in western countries, doctors will check your body. They might give you some  pills to cure(治愈) your disease. People who are easily nervous and{#blank#}4{#/blank#}might have too much yang in their bodies. Chinese doctors believe they should eat more yin food.

    Why do you think people who live in some hot countries eat very spicy(辛辣的)food？Is it because the spices(调味品)make the food taste better？Is it just because their parents and grandparents and great-grandparents liked hot food, or is there some{#blank#}1{#/blank#}between spices and healthy food？

    Researchers from Cornell University think that it is because spice plants have some important chemicals. These chemicals can kill bacteria which spoil food.

    "Most common spices can kill 75 to 100{#blank#}2{#/blank#}of the bacteria in food, "explains one of the scientists. The bacteria grow more{#blank#}3{#/blank#}and spoil food more quickly at higher temperatures. For this reason, it is more difficult to keep food from spoiling in hot climates.

    Do you like your food spicy？You answer probably tells something about the country you come from. If you like spicy food, it is possible that hundreds of years ago, when there were no fridge, people in your country started using spices to keep the food from spoiling. The traditional spicy dishes helped those people to live{#blank#}4{#/blank#}, healthier lives. Today, in a time of fridges, the spices just make the food taste good.