然而，一些营养学家建议不要养成完全素食的饮食习惯。

However, some nutritionists advise against switching to a totally strict vegetarian diet.

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避免食用肉类；如果不能做到完全素食，你可以吃深海鱼。

Avoid meat; if you cannot handle strict vegetarian diet, you may eat deep-sea fish.

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一个完全素食的世界必须想法替代每年来自畜牧业的1100万吨的皮革200万吨的羊毛。

A meat-free world would have to replace the 11 million tonnes of leather and 2 million tonnes of wool that come from livestock farming every year.

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In order to have a completely balanced diet that's completely plant based, one has to be very careful about having a wide array of foods.

为了形成一个完全以素食为主的,平衡饮食结构,你必须非常注意,广泛摄入各类食物

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选