Its also important to understand that the human body has learnt to cope with small amounts of many toxic chemicals produced by the plants we eat : these chemicals are produced by plants as their own natural defense system against many insect and parasitic pests 尤其是人体早已学会如何应付许多从我们吃的植物中产生的少量毒性化学物质，这些化学物质是由植物因应付许多昆虫和害虫而自然产生的防卫系统。
