今天我们要学的词是diet. Diet 名词，意思是饮食。

对人类早期的牙齿化石进行的研究发现，About 3.5 million years ago early humans expanded their diet to include grasses and possibly animals。 古人类在大约350万年前急剧扩大饮食结构，开始食用草类，甚至是动物。你是素食主义者吗？最新研究显示，A vegetarian diet has been linked to lower death rates when compared to meat-eaters. 素食者跟吃肉的人相比，同期死亡率偏低。另外一项有趣的研究发现，Obese patients trust diet advice from overweight doctors more than advice from normal weight doctors. 跟正常体重的医生相比较，肥胖病人更相信体重超重医生提供的饮食建议。今天我们学习的词是 diet, diet, diet...