Studies have shown that people who eat a meat-heavy diet can reduce their food-related footprint by one third or more by moving to a vegan diet.

研究表明，吃肉较多的人可以通过转向纯素饮食将食物相关的生态足迹减少三分之一或更多。

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It usually has less fat than a diet that includes meat.

其脂肪含量通常比包括肉类的饮食少。

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A vegetarian diet also provides many vitamins that people can't get from meat.

素食也能提供很多人们无法从肉类中获得的维生素。

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Now there are challenges to a plant based diet which made eating meat important to humans in human history.

在人类历史上,以素食为主的饮食方式面临各种挑战,使得进食肉类变得重要

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Then going from a plant based diet to a diet that included meat.

人类的饮食由植食性发展为含肉类的饮食

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Now that seems counterintuitive now because we think that a plant based diet may be more healthy for people than a meat based diet, but remember, that we're fighting off overnutrition and these folks were fighting off undernutrition.

现在看来似乎并非如此,因为我们认为,对于人类来说,植物性饮食比以动物性饮食更为健康,但是请记住,我们正在对抗营养过剩,而这些人们正在和营养不良作斗争

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Dr. Colin Campbell of Cornell University advocates a meat-free diet.

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These people almost universally went from a cooked food, meat-centered diet and gave up their meat, their dairy products and their refined sugar and switched to a raw food vegetarian diet, and by simply changing diets their bodies were able to cure their cancer.

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But to Kerswell, the research seems unnecessary, particularly as many vegetarians believe a diet excluding meat is more healthy.

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