人们把蔬菜分为叶菜类、根茎类、瓜类、茄果类等,主要是按其可食部分不同和结构划分。人们食用时通常只取其主要部分,把次要部分丢弃。实际上,部分蔬菜所谓的无用部分其实口味和营养价值都很好,甚至其营养价值大大超过其主要部分,如芹菜叶、辣椒叶、莴苣叶、胡萝卜叶、甘薯叶、 Vegetables are divided into leafy vegetables, rhizomes, melons, solanaceous, etc., mainly according to their edible part of the different and structure. People usually only take the main part of their food, the main part of the discarded. In fact, part of the so-called useless part of the vegetable actually has good taste and nutritional value, and even its nutritional value greatly exceeds its main parts such as celery leaves, pepper leaves, lettuce leaves, carrot leaves, sweet potato leaves,