Food may never cure any particular disease, but diets rich in fruits and vegetables, cereals and plant-sourced oils offer protection from many cancers, cardiovascular disease, and other illnesses associated with old age. The problem, for scientists and consumers alike, is that the benefits are not the same for everyone.
实际上，每个人都知道食物对健康可能有益也可能有害。食物无法治疗某一种疾病，但是大量摄入水果、蔬菜、谷类和植物油能有效防止多种癌症、心血管疾病和其他老年病。对科学家和消费者来说，同样的问题是，每个人的受益程度各有区别。