Chang points out that just as an orchestra is made up of woodwinds, strings, brass, and percussion, so a balanced diet must include food from each of the basic food groups.
她比喻，就像一個交響樂團，須有各式管樂、弦樂，才能結合各種樂器的特色，演奏出完美的大合奏曲。吃素也是一樣，五穀類若和豆類、堅果一齊食用，使其胺基酸產生互補作用，就可提昇素食蛋白質的品質。邱清華博士認為無論吃素與否，均衡的營養都為人體所必須。