青少年时期正处于长知识、长身体的关键时期，长身体需要大量的蛋白质、脂肪、糖、维生素、矿物质等营养物质。而蛋白质等营养物质，又大量存在于动物性食物中。因此，青少年吃鸡鸭肉、猪肉(瘦)、猪内脏、蛋、鱼和牛奶等动物性食品有利于生长发育。青少年不宜只吃素食 Teenagers are in the critical period of long knowledge and long body, and they need large quantities of nutrients such as protein, fat, sugar, vitamins and minerals. The protein and other nutrients, but also a large number in animal food. Therefore, adolescents eat chickens and ducks, pork (lean), pig offal, eggs, fish and milk and other animal foods conducive to the growth and development. Adolescents should not eat vegetarian