鸡蛋等蛋白质丰富的食品中富含胆碱。胆碱是人体必需的营养素，因为它参与细胞膜的形成和神经递质乙酰胆碱的合成，而这些会影响记忆。
Choline, found in protein-rich food such as eggs, is needed by everyone for the production of cell membranes and for making the neurotransmitter acetylcholine, which affects memory.
人体需要的必需营养素可分成六大类：蛋白质、肪、水化合物与微量元素、生素，矿物质和水。
The essential nutrients in body can be grouped into6 categories: proteins, fats, carbohydrates and trace elements, vitamins, minerals and water.
人体需要的必需营养素可分成六大类：蛋白质、脂肪、碳水化合物与微量元素、维生素，矿物质和水。
The essential nutrients in body can be grouped into 6 categories: proteins, fats, carbohydrates and trace elements, vitamins, minerals and water.
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