当代,许多常见的疾病是我们祖先少见或未曾见过的,也可视为人类对显著的外环境变化不适应的结果。近代,随着工业化与人们的生活和工作环境的变化,运输工具、空气和农业,甚至食品也已受影响。人类采用了一些无益于健康的诸如不活动、吸烟、饮酒和服一些药物以及不顾食谱平衡的过食等习惯。 At present, many common diseases are rare or unseen by our ancestors and can also be regarded as the result of human being’s unwillingness to noticeable external environment changes. In modern times, with the changes of industrialization and people’s living and working environment, transport, air and agriculture and even food have also been affected. Humans have adopted a number of unhealthy habits such as inactivity, smoking, drinking and taking certain drugs, and eating too much despite the balance of the diet.