information from 100 countries to identify what people ate and how a diet affected health.He noted a movement beginning in the 1960s.He found that as nations industrialized (工业化)，population increased and earnings rose，more people began to adopt what has been called the Western diet.

　　The Western diet is high in sugar，fat，oil and meat.By eating these foods，people began to get fatter and sicker.David Tilman says overweight people are at greater risk of non­infectious diseases like diabetes (糖尿病) and heart disease.

　　Unfortunately when people become industrialized，if they adopt this Western diet，they are going to have these health problems，especially in developing countries in Asia.China is an example where the number of diabetes cases has been jumping from less than one percent to 10 percent of the population as they began to industrialize over a 20­year period.And that is happening all across the world，in Mexico，in Nigeria and so on.

　　And，a diet bad for human beings，is also bad for the environment.As the world’s population grows，more forests and tropical (热带的) areas will become farmlands for crops or grasslands for cattle.We are likely to have more greenhouse gas in the future from agriculture than that coming out of all forms of transportation right now.

　　Mr.Tilman calls the link between the diet，the environment and human health，“a trilemma”—a problem offering a difficult choice.He says one possible solution is leaving the Western diet behind.

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