本书按食物的功效将其分为六大类，帮助大家正确地选择饮食。具体内容包括：食物对人体健康的影响、食物的神奇功效、让你更聪明的小食物等。（The book divides the food into six categories according to the effect, and helps people to choose diet correctly, mainly including: the impact of food on human health, food magical efficiency, small food that makes you smarter, etc. )